KR101787526B1 - Laser apparatus and method for generating laser by using the laser apparatus - Google Patents

Abstract

According to exemplary embodiments, a laser apparatus and a laser generating method are provided. A laser device according to an embodiment generates a trigger signal from a laser modulated signal. The laser device then synchronizes the optical pumping device from the trigger signal to emit pumping light to the gain medium.

Description

Technical Field [0001] The present invention relates to a laser apparatus and a laser generating method,

The present invention relates to a laser generating method using a laser device and a laser device, and a technique for generating laser light by supplying pumping light to a gain medium so that a gain medium of the laser device is not damaged.

Generally, the laser machining process refers to a process of processing the shape and physical properties of the surface of a workpiece by scanning a laser beam on the surface of the workpiece. There are various examples of such a workpiece, Lt; / RTI > Examples of the laser processing step include patterning for forming a pattern on a surface of a workpiece, processing for deforming the physical properties of the workpiece, heating the workpiece using a laser and deforming the shape of the workpiece, A step of cutting the object, and the like.

A laser (LASER) device is a mechanical device designed to generate laser light using a stimulated emission phenomenon of light. The laser uses a main resonator to induce light to be emitted, allowing the beam to emit coherence. Due to the monochromaticity of the laser and its adaptation characteristics, the laser device is being used effectively throughout the industry, including the manufacturing process. In addition, the skin can be precisely cut during surgical operation, It is also widely used as a medical device that plays a role of

The laser device can generate laser light using only the main resonator described above, but amplifies the energy of the laser light by using a gain medium to emit laser light having high intensity. The laser device injects excitation energy into the gain medium through an optical pumping action. Then, the electrons in the gain medium are excited by the optical pumping action to generate laser light.

However, in the process of optical pumping inside the gain medium, a heating phenomenon may occur in the gain medium. And, if more energy is injected into the gain medium than the allowable value, the gain medium is damaged and damaged.

Thereby preventing the gain medium from being damaged due to the high temperature in the process of generating laser light by using the gain medium.

In one aspect,

A laser modulation signal generator for generating a laser modulation signal;

A first trigger signal generator for receiving the laser modulated signal and generating a first trigger signal;

A second trigger signal generator for receiving the laser modulated signal and generating a second trigger signal;

A seed laser generator synchronized by the first trigger signal to emit the seed laser light into the gain medium; And

And a light pumping device synchronized by the second trigger signal to emit pumping light into the gain medium.

The optical pumping device may comprise a laser diode.

The optical pumping device may further include a current supply unit for supplying current to the laser diode, and the current supply unit may be synchronized by the second trigger signal to change the current level.

The second trigger signal generator may receive the laser modulated signal and generate the second trigger signal after a predetermined delay time.

Wherein the first trigger signal generator receives the laser modulated signal and generates the first trigger signal after a first delay time and the second trigger signal generator receives the laser modulated signal and a second delay time After this, the second trigger signal is generated,

The second delay time may be greater than the first delay time.

The optical pumping device may emit the pumping light as impulse light.

The pulse width of the impulse light may depend on a predetermined amplification rate of the seed laser light.

The optical pumping device may cause the emission of the impulse light to be terminated at any point in time during which the intensity of the seed laser light is maximized and immediately before the seed laser light is generated at the maximum intensity of the seed laser light .

In another aspect,

Generating a laser modulated signal;

Generating a first trigger signal from the laser modulated signal;

Generating a second trigger signal from the laser modulated signal;

Synchronizing with the first trigger signal to emit the seed laser light into the gain medium;

And synchronizing by the second trigger signal to emit pumping light into the gain medium.

The step of emitting the pumping light to the gain medium comprises:

The current level supplied to the laser diode by the second trigger signal can be changed.

The generating of the second trigger signal may generate the second trigger signal after receiving the laser modulated signal and after a predetermined delay time.

Wherein generating the first trigger signal comprises receiving the laser modulated signal and generating the first trigger signal after a first delay time and generating the second trigger signal comprises receiving the laser modulated signal And after the second delay time, generating the second trigger signal,

The second delay time may be greater than the first delay time.

The step of emitting the pumping light to the gain medium may emit the pumping light as impulse light.

The pulse width of the impulse light may depend on the amplification rate of the predetermined seed laser light.

Wherein the step of emitting the pumping light to the gain medium comprises the step of emitting the impulse light at a point in time during which the intensity of the seed laser light becomes maximum from immediately before the seed laser light is generated to the intensity of the seed laser light, Can be made to be a species.

According to exemplary embodiments, the optical pumping device may be synchronized by a trigger signal to emit pumping light into the gain medium. This prevents excessive energy from being stored in the gain medium. In addition, the power consumption of the optical pumping device can be reduced.

1 is a view showing a laser device according to a comparative example.
FIG. 2 is a graph showing a change in the amount of energy in the gain medium when the seed laser beam is generated non-periodically in the laser device according to the comparative example.
3 is a diagram illustrating a laser device according to an exemplary embodiment.
4 is a diagram exemplarily showing a laser modulation signal, a first trigger signal, and a second trigger signal.
5 is a diagram exemplarily showing a laser modulation signal, a first trigger signal, and a second trigger signal.
Figs. 6 and 7 are diagrams showing exemplary output powers of the laser modulation signal and the seed laser light and output powers of pumping light.
FIG. 8 is a graph showing changes in energy amount stored in the gain medium and optical power variation of the output laser as seed laser light and pumping light are emitted as shown in FIG.
9 is a diagram showing a case where seed laser light is emitted non-periodically.
FIG. 10 is a flowchart showing a laser generating method using the laser device described with reference to FIGS. 3 to 9. FIG.

In the following drawings, like reference numerals refer to like elements, and the size of each element in the drawings may be exaggerated for clarity and convenience of explanation. On the other hand, the embodiments described below are merely illustrative, and various modifications are possible from these embodiments.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

The singular expressions include plural expressions unless the context clearly dictates otherwise. Also, when an element is referred to as "comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise.

Also, the terms " part, " " module, " and the like, which are described in the specification, refer to a unit that processes at least one function or operation.

1 is a view showing a laser device according to a comparative example.

Referring to FIG. 1, the laser device according to the comparative example may include a seed laser generator 10 for generating a seed laser. The seed laser generator 10 can generate laser light pulses. The seed laser generator 10 may transmit a laser light pulse through the optical fiber 22 to the gain medium 20.

The laser device according to the comparative example may include an optical pumping device 30 for supplying energy to the gain medium 20. [ The optical pumping device 30 can increase the amount of energy stored in the gain medium 20 by irradiating the gain medium 20 with light. The gain medium 20 can amplify the seed laser beam transmitted from the seed laser device 10. The gain medium 20 can emit an output optical signal S2 having the same shape as the seed laser light signal S1 by amplifying the seed laser light signal S1.

According to the comparative example, the optical pumping device 30 can continuously emit pumping light of a constant intensity into the gain medium 20. [ Therefore, the amount of energy stored in the gain medium 20 can be increased as the time for the optical pumping device 30 to emit pumping light into the gain medium 20 increases. When the seed laser light is irradiated on the gain medium 20, the gain medium 20 can amplify the seed laser light using the energy stored in the gain medium 20 and emit the amplified seed laser light as the output laser light.

When the gain medium 20 emits output laser light, the energy stored in the gain medium 20 can be emitted to the outside. Therefore, when the seed laser light is irradiated to the gain medium 20 in a periodic pulse shape, the amount of energy stored in the gain medium 20 can be repeatedly increased and decreased periodically. However, when the seed laser light is irradiated to the gain medium 20 non-periodically, excessive energy can be supplied to the gain medium 20 in a section where the irradiation time interval of the seed laser light is long.

FIG. 2 is a graph showing a change in the amount of energy in the gain medium 20 when the seed laser beam is generated aperiodically in the laser device according to the comparative example.

2 (a) is a graph showing a change with time of the output power of the seed laser beam emitted from the seed laser generator 10. The graph (b) is a graph showing a change with time of the output power of the pumping light emitted to the gain medium 20 by the optical pumping device 30. The graph (c) is a graph showing a change with time of the amount of energy stored in the gain medium 20.

Referring to FIG. 2, the optical pumping device 30 can emit pumping light of a certain intensity into the gain medium 20. In this case, the output power of the output laser light emitted from the gain medium 20 can be adjusted by adjusting the intensity of the pumping light. (c) Referring to the graph, the amount of energy stored in the gain medium 20 may increase as the pumping light is irradiated to the gain medium 20. When the seed laser light is incident on the gain medium 20, the amount of energy stored in the gain medium 20 can be drastically reduced as the output laser light is emitted from the gain medium 20.

While the seed laser light periodically enters the gain medium 20, the amount of energy stored in the gain medium 20 may also increase and decrease periodically. Therefore, the amount of energy stored in the gain medium 20 may not increase by more than a certain amount. However, the amount of energy stored in the gain medium 20 may continuously increase during the period in which the seed laser light does not enter in the period where the seed laser light enters the gain medium 20 non-periodically. If the time during which the seed laser beam is not emitted is prolonged, the amount of energy stored in the gain medium 20 may become excessively high.

If the amount of energy stored in the gain medium 20 becomes excessively high, the gain medium 20 may be damaged by overheating. For example, if the amount of energy stored in the gain medium 20 is higher than the allowable value, a stimulated Brillouin scattering phenomenon may occur in the gain medium 20. That is, the incident light and the scattered light are non-linearly combined in the gain medium 20 and amplified, resulting in a high temperature phenomenon of the gain medium 20. [

3 is a diagram illustrating a laser device 100 according to an exemplary embodiment.

Referring to FIG. 3, a laser device 100 according to an exemplary embodiment includes a laser modulation signal generator 110 for generating a laser modulation signal, a first trigger (not shown) for receiving a laser modulation signal and generating a first trigger signal, A second trigger signal generator 132 for receiving the laser modulated signal and generating a second trigger signal, a seed laser for synchronizing with the first trigger signal to emit the seed laser light into the gain medium, And an optical pumping device 134 that is synchronized by the device 124 and a second trigger signal to emit pumping light into the gain medium.

The laser modulation signal generator 110 may generate a predetermined pulse signal as a laser modulation signal. The laser modulation signal can be generated periodically or aperiodically. The laser modulation signal of the laser modulation signal generator 110 may be a signal that causes the laser device 100 to output laser light.

The first trigger signal generator 122 may receive the laser modulated signal from the laser modulated signal generator. When the first trigger signal generator 122 receives the laser modulation signal, it can generate the first trigger signal. The first trigger signal may cause the generator 122 to send a first trigger signal to the seed laser generator 124. [ The seed laser generating device 124 can be synchronized by the first trigger signal. Synchronization of the seed laser generating device 124 means that the operation state of the seed laser generating device 124 is changed and when the seed laser generating device 124 is synchronized by the first trigger signal, The seed laser light can be emitted to the outside.

The second trigger signal generator 132 may receive the laser modulated signal from the laser modulated signal generator. When the second trigger signal generator 132 receives the laser modulation signal, it can generate the second trigger signal. The second trigger signal may cause the generator 132 to send a second trigger signal to the optical pumping device 134. The optical pumping device 134 may be synchronized by the second trigger signal. The fact that the optical pumping device 134 is synchronized means that the operational state of the optical pumping device 134 is changed.

For example, the optical pumping device 134 may include a laser diode 134b and a current supply 134a that supplies current to the laser diode 134b. The current supply 134a of the optical pumping device 134 can change the current level that is synchronized by the second trigger signal and supplies it to the laser diode 134b. The light energy emitted by the laser diode 134b to the gain medium 138 may be changed by changing the current level supplied to the laser diode 134b by the current supply unit 134a.

The seed laser device 124 may be synchronized by the first trigger signal to emit the seed laser light to the gain medium 138. [ The seed laser device 124 may include a main resonator therein. The seed laser device 124 can emit the coherent laser light as the seed laser light by inducing and emitting light by the main resonator. The intensity of the seed laser light emitted from the seed laser device 124 may have a pulse shape. The seed laser light can be emitted periodically or aperiodically.

Gain medium 138 may illustratively include active ions obtained from rare earth elements such as ytterbium (Yb), neodymium (Nd), erbium (Er), thulium (Tm) The gain medium 138 may also include active ions, which are illustratively obtained from transition metal elements such as chromium (Cr), titanium (Ti), and the like.

The transition metal elements such as active ions or chromium (Cr), titanium (Ti), etc., obtained from rare earth elements such as ytterbium (Yb), neodymium (Nd), erbium (Er), thulium The gain medium 138 may be in a doped state due to the obtained active ion. The gain medium 138 may amplify the seed laser light using the energy supplied from the optical pumping device 134 and emit the amplified seed laser light as the output laser light.

The optical pumping device 134 may be synchronized by a second trigger signal to emit pumping light to the gain medium 138. The amount of energy that the optical pumping device 134 supplies to the gain medium 138 can be determined by the time it irradiates the pumping light. The optical pumping device 134 may emit pumping light into the gain medium 138 in a single pulse form each time it senses a second trigger signal. That is, the optical pumping device 134 may emit impulse light into the gain medium 138 every time it senses the second trigger signal. The time interval at which the optical pumping device 134 emits the impulse light may depend on the time interval during which the second trigger signal is generated. In addition, the pulse width of the impulse light emitted by the optical pumping device 134 may depend on the output power of the predetermined output laser light. For example, when the amplification ratio between the seed laser light and the output laser light is large, the pulse width of the impulse light can be relatively large. On the other hand, when the amplification ratio between the seed laser light and the output laser light is small, the pulse width of the impulse light can be relatively small.

4 is a diagram exemplarily showing a laser modulation signal, a first trigger signal, and a second trigger signal.

4 (a) is a graph showing a change in intensity of a laser modulation signal generated in the laser modulation signal generator 110 with time. The graph (b) is a graph showing a change in intensity with time of the first trigger signal. The graph (c) is a graph showing the intensity change with time of the second trigger signal.

Referring to FIG. 4, when a laser modulation signal is generated, corresponding first and second trigger signals may be generated. The first and second trigger signals may be electrical pulse signals. The first and second trigger signal generators 122 and 132 may extract triggers from the laser modulated signals to generate first and second trigger signals, respectively. The pulse widths of the first and second trigger signals may be narrower than the pulse width of the laser modulation signal.

The first trigger signal generator 122 may generate the first trigger signal after a predetermined delay time d elapses after sensing the laser modulation signal. On the other hand, the second trigger signal generator 132 may generate the second trigger signal immediately upon detecting the laser modulated signal. Therefore, the first trigger signal can be generated with a delay than the second trigger signal.

If the first trigger signal is generated in a delayed manner than the second trigger signal, the seed laser light can be emitted later than the pumping laser light. If the seed laser light is emitted later than the pumping laser light, energy may be stored in the gain medium 138 by the pumping light before the seed laser light is emitted. The gain medium 138 can amplify the seed laser light using the energy stored by the pump light until the seed laser light is emitted. The rate at which the seed laser light is amplified may depend on the amount of energy stored in the gain medium 138. The amount of energy stored in the gain medium 138 may also depend on the time that the pumping light is emitted to the gain medium 138 before the seed laser light is incident on the gain medium 138. And it may depend on the pumping light irradiation time required for the seed laser light amplification. Therefore, the delay time until the first trigger signal generator 122 detects the laser modulation signal and the first trigger signal is generated may depend on the pumping light irradiation time required for the seed laser light amplification. Further, the delay time until the first trigger signal generator 122 detects the laser modulation signal and the first trigger signal is generated may be changed according to the pulse width of the pumping light.

5 is a diagram exemplarily showing a laser modulation signal, a first trigger signal, and a second trigger signal.

5 (a) is a graph showing a change in intensity of a laser modulation signal generated in the laser modulation signal generator 110 with time. The graph (b) is a graph showing a change in intensity with time of the first trigger signal. The graph (c) is a graph showing the intensity change with time of the second trigger signal.

Referring to FIG. 5, when a laser modulation signal is generated, corresponding first and second trigger signals may be generated. The first and second trigger signals may be electrical pulse signals.

The first trigger signal generator 122 may generate the first trigger signal after the first delay time d1 elapses after sensing the laser modulation signal. On the other hand, the second trigger signal generator 132 may generate the second trigger signal after the second delay time d2 elapses after sensing the laser modulation signal. The first delay time d1 may be greater than the second delay time d2. Therefore, the first trigger signal can be generated with a delay than the second trigger signal.

The rate at which the seed laser light is amplified may depend on the amount of energy stored in the gain medium 138. The amount of energy stored in the gain medium 138 may also depend on the time that the pumping light is emitted to the gain medium 138 before the seed laser light is incident on the gain medium 138. Therefore, the difference between the first delay time d1 and the second delay time d2 may depend on the pumping light irradiation time required for the seed laser light amplification. Further, the difference between the first delay time d1 and the second delay time d2 may be changed according to the pulse width of the pumping light.

Figs. 6 and 7 are diagrams showing exemplary output powers of the laser modulation signal and the seed laser light and output powers of pumping light.

6 and 7 are graphs showing changes in intensity of the laser modulation signal generated in the laser modulation signal generator 110 with time. The graph (b) is a graph showing an output power change with time of the seed laser light emitted from the seed laser light generator. The graph (c) is a graph showing an output power change with time of the pumping light emitted from the optical pumping device 134.

Referring to FIG. 6, the seed laser light can be emitted more delayed than the pumping light. In addition, the pumping light and the seed laser light may be emitted in an impulse form every time a laser modulation signal is generated. The pumping light can be terminated at the point when the intensity of the seed laser light becomes maximum. As another example, referring to FIG. 7, the pumping light may be terminated immediately before the seed laser light is generated.

That is, the pumping light can be emitted only up to a point in time during which the intensity of the seed laser light is maximized before the seed laser light is emitted. For example, the emission of the pumping light may be terminated at the time when the intensity of the seed laser light becomes maximum or immediately before the seed laser light is emitted. If the pumping light is emitted only up to the time interval described above, the energy of the pumping light can all be used to amplify the seed laser light. Therefore, it is possible to prevent unnecessary energy from remaining in the gain medium 138 after the seed laser light is amplified and output. Also, the amount of energy consumed to be supplied to the gain medium 138 can be reduced.

The time point at which the emission of the pumping light is terminated and the point at which the emission of the seed laser light starts or becomes maximum can be equalized by adjusting the pulse width of the pumping light and the time difference in which the first trigger signal and the second trigger signal are generated. The amount of energy stored in the gain medium 138 can be used to amplify the seed laser light when pumping light is emitted only to the point where the emission of the seed laser light starts or becomes maximum. In addition, the power required to emit pumping light can be reduced.

FIG. 8 is a graph showing changes in energy amount stored in the gain medium and optical power variation of the output laser as seed laser light and pumping light are emitted as shown in FIG.

In FIG. 8, (a) is a graph showing an output power change with time of the seed laser beam. The graph (b) is a graph showing the change in output power with time of the pumping light. The graph (c) is a graph showing a change with time of the amount of energy stored in the gain medium 138. (D) is a graph showing the output power variation of the output laser light with time.

Referring to FIG. 8, the amount of energy stored in the gain medium 138 may increase while the pumping light is emitted. When the seed laser light is emitted, the amount of energy stored in the gain medium can be reduced as the output laser light is emitted from the gain medium 138. The amount of energy stored in the gain medium may not exceed the allowable value since the seed laser light and the pumping light are emitted synchronously together. Further, since the pumping light is emitted before the seed laser light is emitted, energy for amplification may be stored in the gain medium 138 when the seed laser light is emitted. In addition, since the pumping light is not emitted after the seed laser beam is emitted, unnecessary energy can be prevented from accumulating in the gain medium 138.

9 is a diagram showing a case where seed laser light is emitted non-periodically.

9 (a) is a graph showing the change in output power of the seed laser light with time. The graph (b) is a graph showing the change in output power with time of the pumping light. The graph (c) is a graph showing a change with time of the amount of energy stored in the gain medium 138. (D) is a graph showing the output power variation of the output laser light with time.

Referring to FIG. 9, pumping light may also not be emitted in an interval in which seed laser light is not emitted. In the case of FIG. 2, when the pumping light is uniformly emitted, the energy stored in the gain medium 138 becomes excessive when the seed laser light is emitted non-periodically, and the gain medium 138 may be damaged. However, in the case of FIG. 8, since the pumping light is also emitted synchronously by the second trigger signal, the pumping light may not be emitted in a time period during which the seed laser light is not emitted. Further, the amplification ratio of the seed laser light can be determined by the pulse width of the pumping light. Therefore, it is possible to prevent the amount of energy stored in the gain medium 138 from becoming excessive.

10 is a flowchart showing a laser generating method using the laser device 100 described with reference to Figs. 3 to 9. Fig.

In the following description of the embodiment of FIG. 10, the overlapping description with FIGS. 3 to 9 will be omitted.

Referring to FIG. 10, a method of generating a laser according to an exemplary embodiment includes generating 1110 a laser modulated signal, generating 1114 a first trigger signal from the laser modulated signal, (1140) synchronized by the first trigger signal to release the seed laser light into the gain medium (138), and generating a pumping light synchronized by the second trigger signal to generate the pumping light in the gain medium 138). ≪ / RTI >

In step 1110, the laser modulation signal generator 110 may generate a laser modulation signal. The laser modulated signal may be generated periodically or aperiodically with a predetermined pulse signal.

In step 1120, the first trigger signal generator 122 may receive the laser modulated signal and generate a first trigger signal. The first trigger signal can synchronize the seed laser generator 124.

In step 1130, the second trigger signal generator 132 may receive the laser modulated signal and generate a second trigger signal. The second trigger signal can synchronize the optical pumping device 134.

The first trigger signal and the second trigger signal may be generated after a different delay time has elapsed after the laser modulation signal is generated, respectively. For example, the first trigger signal may be generated more delayed than the second trigger signal. And, the seed laser light can be emitted later than the pumping light.

In step 1140, the seed laser light generator 124 may emit seed laser light into the gain medium 138. Additionally, in step 1150, the optical pumping device 134 may emit pumping light into the gain medium 138. The timing at which the seed laser light and the pumping light are emitted may be determined by the generation timing of the first and second trigger signals, respectively.

The optical pumping device 134 may emit pumping light into the gain medium 138 with impinging light whenever it receives the second trigger signal. The pulse width of the impulse light may depend on the amplification rate of the predetermined seed laser light. Further, in step 1140, the optical pumping device 134 may terminate the emission of the pumping light emitted in the impulse light when the intensity of the seed laser light is at its maximum. As described above, by regulating the emission of the pumping light, power consumption of the pumping light can be reduced, and energy stored in the gain medium 138 can be efficiently managed.

Hereinabove, with reference to Figs. 1 to 10, the laser device and the laser generating method using the laser device according to the comparative example and the exemplary embodiment have been described. According to embodiments, the optical pumping device 134 may be synchronized by a trigger signal to emit pumping light into the gain medium 138. [ This can prevent excess energy from being stored in the gain medium 138. Also, the power consumption of the optical pumping device 134 can be reduced.

While a number of embodiments have been described in detail above, they should be construed as examples of preferred embodiments rather than limiting the scope of the invention. Therefore, the scope of the present invention should not be limited by the described embodiments but should be determined by the technical idea described in the claims.

110: laser modulation signal generator
122: first trigger signal generator
132: second trigger signal generator
124: Seed laser generator
134: Optical pumping device
138: gain medium
134a: Laser diode
134b:

Claims (15)

A laser modulation signal generator for generating a laser modulation signal;
A first trigger signal generator for receiving the laser modulated signal and generating a first trigger signal;
A second trigger signal generator for receiving the laser modulated signal and generating a second trigger signal;
A seed laser generator synchronized by the first trigger signal to emit the seed laser light into the gain medium; And
And an optical pumping device synchronized by the second trigger signal to emit pumping light into the gain medium,
The optical pumping device emits the pumping light as impulse light,
Wherein the pulse width of the impulse light depends on an amplification rate of the seed laser light set in advance. The method according to claim 1,
Wherein the optical pumping device comprises a laser diode. 3. The method of claim 2,
Wherein the optical pumping device further comprises a current supplying part for supplying current to the laser diode, and the current supplying part is synchronized by the second trigger signal to change the current level. The method according to claim 1,
Wherein the second trigger signal generator receives the laser modulated signal and generates the second trigger signal after a predetermined delay time. The method according to claim 1,
Wherein the first trigger signal generator receives the laser modulated signal and generates the first trigger signal after a first delay time and the second trigger signal generator receives the laser modulated signal and a second delay time After this, the second trigger signal is generated,
Wherein the second delay time is larger than the first delay time. delete delete The method according to claim 1,
Wherein the optical pumping device is configured to terminate the emission of the impulse light at any point in time during which the intensity of the seed laser light becomes maximum from immediately before the generation of the seed laser light. Generating a laser modulated signal;
Generating a first trigger signal from the laser modulated signal;
Generating a second trigger signal from the laser modulated signal;
Synchronizing with the first trigger signal to emit the seed laser light into the gain medium;
And synchronizing by the second trigger signal to emit pumping light into the gain medium,
The step of emitting the pumping light to the gain medium may include emitting the pumping light as impulse light,
Wherein a pulse width of the impulse light is dependent on a predetermined amplification rate of the seed laser light. 10. The method of claim 9,
The step of emitting the pumping light to the gain medium comprises:
And changes the current level supplied to the laser diode by the second trigger signal. 10. The method of claim 9,
Wherein generating the second trigger signal comprises receiving the laser modulated signal and generating the second trigger signal after a predetermined delay time. 10. The method of claim 9,
Wherein generating the first trigger signal comprises receiving the laser modulated signal and generating the first trigger signal after a first delay time and generating the second trigger signal comprises receiving the laser modulated signal And after the second delay time, generating the second trigger signal,
Wherein the second delay time is greater than the first delay time. delete delete 10. The method of claim 9,
Wherein the step of emitting the pumping light to the gain medium causes the emission of the impulse light to be terminated at any point in time during which the intensity of the seed laser light becomes maximum from immediately before the seed laser light is generated.

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