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WO2009030550A1 - Procédé pour faire fonctionner un dispositif laser - Google Patents

Procédé pour faire fonctionner un dispositif laser Download PDF

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Publication number
WO2009030550A1
WO2009030550A1 PCT/EP2008/059309 EP2008059309W WO2009030550A1 WO 2009030550 A1 WO2009030550 A1 WO 2009030550A1 EP 2008059309 W EP2008059309 W EP 2008059309W WO 2009030550 A1 WO2009030550 A1 WO 2009030550A1
Authority
WO
WIPO (PCT)
Prior art keywords
laser device
laser
passive
trigger
radiation
Prior art date
Application number
PCT/EP2008/059309
Other languages
German (de)
English (en)
Inventor
Werner Herden
Heiko Ridderbusch
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2009030550A1 publication Critical patent/WO2009030550A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P23/00—Other ignition
    • F02P23/04—Other physical ignition means, e.g. using laser rays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/0627—Construction or shape of active medium the resonator being monolithic, e.g. microlaser
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094049—Guiding of the pump light
    • H01S3/094053—Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/094076—Pulsed or modulated pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • H01S3/0941—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode
    • H01S3/09415—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light of a laser diode the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/10038—Amplitude control
    • H01S3/10046—Pulse repetition rate control
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
    • H01S3/1123—Q-switching
    • H01S3/113—Q-switching using intracavity saturable absorbers

Definitions

  • the invention relates to a method for operating a laser device which has a laser-active solid with a passive Q-switching, in which the laser device is subjected to pumping light in order to generate a laser pulse.
  • the invention further relates to a laser device with a laser-active solid and a passive Q-switching, wherein the laser device can be acted upon with pump light to generate a laser pulse.
  • Such laser devices and operating methods for this purpose are known and have the disadvantage that a point in time at which the laser pulse is generated as a result of the application of pumping light to the laser device can not be precisely predefined.
  • This object is achieved in a laser device of the type mentioned in the present invention that the laser device is acted upon in addition to the pumping light with a trigger radiation is to put the passive Q-switching in a state of increased transmission at a predetermined time.
  • the additional loading of the laser device according to the invention with the trigger radiation advantageously has the effect that a time of fading of the passive Q-switching is controllable.
  • the Pumplichtintenstician can initially optically excited by applying the inventive principle of laser-active solids by the optical pumping that adjusts an increased inversion density, but not already uses a laser operation.
  • the trigger radiation is irradiated to the laser device according to the invention at a predeterminable time, causing the passive Ruschalter fades shortly thereafter and can accordingly set a laser operation in the laser device, which eventually leads to the generation of the laser pulse.
  • the principle according to the invention makes use of the fact that with a suitable loading of the laser device or the passive Q-switching with the trigger radiation, a relatively rapid change in the transmission of the passive Q-switching occurs, so that the laser pulse generates almost no time delay with respect to the exposure of the laser device to the trigger radiation becomes.
  • a particularly small design effort results according to a variant of the invention, when the pumping light and the trigger radiation of the laser device are supplied via the same optical fiber device.
  • the optical waveguide device has a plurality of optical fibers, that the pump light is guided via a first group of optical fibers, and that the trigger radiation is guided via a second group of optical fibers, preferably different from the first group, wherein advantageously by a relative arrangement of the individual optical fibers to each other, a spatial distribution of
  • a further advantage of this variant of the invention is that the plurality of optical fibers combined to form an optical waveguide device allow a particularly simple and efficient coupling of the pumping light and the triggering radiation into the respective optical fibers by assigning the respective optical fibers on the input side to the respective optical source.
  • optical fibers arranged radially on the outside to be used to guide the trigger radiation
  • optical fibers to be used radially to guide the pumping light preferably a coupling-in optical system between an output of the optical waveguide device and the laser device is provided.
  • the coupling-in optical system can, for example, comprise a biconvex lens or a comparable optical system and advantageously effects a focusing of the trigger radiation provided according to the invention on that area of the laser device which has the passive Q-switching. This ensures advantageous that the minimum required intensity of the trigger radiation, which is required for a targeted, rapid fading of the passive Q-switching is achieved.
  • the trigger radiation can also be provided by a separate light source, in particular a laser light source, preferably a semiconductor laser diode, which is preferably arranged directly in the region of the laser device, in particular directly in the region of the passive Q-switching.
  • a separate light source in particular a laser light source, preferably a semiconductor laser diode, which is preferably arranged directly in the region of the laser device, in particular directly in the region of the passive Q-switching.
  • the use of a light guide device for supplying the laser device or the passive Q-switching with the trigger radiation is not required.
  • the coupling of the trigger radiation provided according to the invention may preferably be axial, i. in the usual analogous to the coupling of the pumping light in the laser device, take place; However, it is also conceivable to feed the trigger radiation of the laser device or the passive Q-circuit laterally.
  • the trigger radiation is irradiated at least partially directly into the passive Q-switching, resulting in a particularly efficient optical excitation of the passive Q-switching and a corresponding particularly fast fading of the passive Q-switching, so that a time difference between the application of the passive Q-switching with the trigger radiation and the generation of the laser pulse is minimal.
  • a time profile of the intensity of the trigger radiation in particular a start time and / or an amplitude of a trigger pulse and / or a pulse width and / or a pulse duration as a function of a time course of the intensity of the pump light is given.
  • the operating method according to the invention is particularly well suited for use in a laser-based ignition device of an internal combustion engine, in particular of a motor vehicle.
  • the use of erfindunstraen operating method for ignition of stationary engines or generally other laser pulse applications is also conceivable.
  • a laser device according to claim 10 is given.
  • the laser device according to the invention has means for generating a trigger radiation with which the laser device can be acted upon in addition to the pumping light in order to put the passive Q-switching into a state of increased transmission at a predefinable time.
  • FIG. 1 shows a schematic representation of an internal combustion engine with an ignition device for use with the method according to the invention
  • FIG. 2 shows an embodiment of a laser device according to the invention of the ignition device according to FIG. 1,
  • FIG. 3 a shows a time profile of different operating variables of the laser device according to the invention from FIG. 2,
  • FIG. 3b shows a time profile of a transmission coefficient of a passive Q-switching, which is contained in the laser device according to FIG.
  • FIG. 4 a shows a further embodiment of the laser device according to the invention
  • FIG. 4b shows a cross-section of an optical waveguide device for use with the laser device according to the invention according to FIG. 4a
  • FIG. 5 shows a further cross section of an optical waveguide device for supplying the laser device according to the invention with pump light and with trigger radiation, and
  • FIG. 6 shows a further embodiment of the laser device according to the invention, in which the loading of the laser device with pump light and with the trigger radiation takes place in different areas of the laser device.
  • An internal combustion engine carries in Figure 1 overall the reference numeral 10. It is used to drive a motor vehicle, not shown.
  • the internal combustion engine 10 comprises a plurality of cylinders, of which only one is designated by the reference numeral 12 in FIG.
  • a combustion chamber 14 of the cylinder 12 is limited by a piston 16.
  • Fuel enters the combustion chamber 14 directly through an injector 18, which is connected to a designated also as a rail or common rail fuel pressure accumulator 20.
  • fuel 22 is ignited by means of a laser pulse 24 which is emitted by a laser device 26 comprehensive ignition 27 into the combustion chamber 14.
  • the laser device 26 is fed via a light guide device 28 with a pumping light, which is provided by a pumping light source 30.
  • the pump light source 30 is controlled by a control and regulating device 32, which also controls the injector 18.
  • the pumping light source 30 may be a semiconductor laser diode which, depending on a control current, outputs pumping light of corresponding intensity via the optical waveguide device 28 to the laser device 26.
  • semiconductor laser diodes and other small-scale laser diodes and other small-scale lasers
  • FIG. 2 schematically shows a detail view of the laser device 26 from FIG. 1.
  • the laser device 26 has a laser-active solid 44, to which a passive Q-switching 46, also referred to as Q-switch, is optically arranged downstream.
  • the laser-active solid 44 forms here, together with the passive Q-switching circuit 46 and the coupling mirror 42 arranged on the left thereof in Figure 2 and the Auskoppelapt 48, a laser oscillator whose oscillatory behavior depends on the passive Q-switching 46 and thus at least indirectly controllable in a conventional manner is.
  • the pumping light 60 is directed by the light-guiding device 28 already described with reference to FIG. 1 from the pumping light source 30, which is also already described, to the coupling-in mirror 42. Since the coupling-in mirror 42 is transparent to the wavelength (n) of the pumping light 60, the pumping light 60 penetrates into the laser-active solid 44, resulting in a known population inversion.
  • the passive Q-switching circuit 46 While the passive Q-switching circuit 46 has its idle state in which it has a relatively small transmission coefficient, laser operation is avoided in the laser-active solid 44 or in the solid 44, 46 confined by the input mirror 42 and the output mirror 48. As the pumping time increases, however, the radiation density in the laser oscillator 42, 44, 46, 48 increases, so that the passive Q-switching circuit 46 fades, i. assumes a larger transmission coefficient and laser operation can begin.
  • a laser pulse 24 also referred to as a giant pulse, which has a relatively high peak power.
  • the laser pulse 24 is coupled into the combustion chamber 14 (FIG. 1) of the internal combustion engine 10 using a further optical waveguide device or directly through a combustion chamber window of the laser device 26, so that fuel 22 present therein is ignited.
  • the laser oscillator 42, 44, 46, 48, an unillustrated optical amplifier for the optical amplification of the laser pulse 24 be assigned.
  • the method according to the invention provides for the loading of the laser device 26 or the passive Q-switching 46 contained therein with an additional trigger pulse 24 'present at the time tl is generated and delivered to the laser device 26.
  • Suitable means 50 for generating the trigger pulse 24 ' may be formed, for example, as a semiconductor laser diode and, for example structurally integrated into the pumping light source 30 ( Figure 1).
  • the trigger radiation corresponding to the trigger pulse 24 'from FIG. 3 a is represented by the block arrow 60' in FIG.
  • the additional loading of the laser device 26 according to the invention with the trigger radiation 60 'or the trigger pulse 24' advantageously has the effect that a transmission coefficient T (see FIG. 3b) of the passive Q-switching circuit which is essentially unchanged up to the time t 1 is transferred to the passive Q-switching circuit within a relatively short period of time larger value Ti increases, which corresponds to the faded state of the passive Q-switching circuit 46.
  • the onset of the laser operation can be predetermined by the selection of the start time tl and accordingly also the generation of the laser pulse 24, which is emitted according to Figure 3a shortly thereafter, at the time t3, from the laser device 26.
  • Figure 4a shows a particularly advantageous embodiment of the laser device 26 according to the invention, in which both the pump light 60 (not shown) and the trigger radiation 60 'of the laser device 26 by means of a single optical fiber device 28 is supplied.
  • the optical waveguide device 28 has the cross section depicted in FIG. 4b, from which it can be seen that the optical waveguide device 28 is formed by a plurality of individual optical fibers 28a, 28b combined in different groups.
  • the optical fibers 28a of the first group arranged radially on the outside according to FIG. 4b are provided according to the invention for guiding the trigger radiation 60 '(FIG. 4a).
  • the coupling-out optical system 40 which is designed as a biconvex lens, for example, which is arranged between an end section 28 'of the optical waveguide device 28 and the laser device 26, advantageously provides the possibility of optimally focusing the triggering radiation 60' on the passive Q-switching circuit 46, so that a sufficiently high radiation density of the trigger radiation 60 'is available for the inventive stimulated bleaching of the passive Q-switching circuit 46.
  • the laser device 26 is supplied with the pumping light 60 (FIG. 2) via the radially inner optical fibers 28 b of the optical waveguide device 28 in accordance with the cross section according to FIG. 4 b.
  • the source 50 may be e.g. may also be provided directly in the region of the laser device 26, which is indicated in Figure 4a by the function block 50 shown in dashed lines.
  • the source 50 which is e.g. a single laser emitter can advantageously also be arranged directly on the laser device 26, preferably in the region of the passive Q-switching circuit 46, so that the trigger radiation 60 'can be supplied directly to the passive Q-switching circuit 46 without substantial transmission losses.
  • FIG. 1 Another very advantageous configuration of the optical waveguide device 28 according to the invention is shown schematically in FIG. In contrast to the configuration of Figure 4b is in the
  • a central optical fiber 28c centered, which is provided for transmitting the trigger radiation 60 'from a corresponding radiation source such as a laser light source, preferably a semiconductor laser diode (not shown).
  • a corresponding radiation source such as a laser light source, preferably a semiconductor laser diode (not shown).
  • further optical fibers 28d are provided, which serve to guide the pumping light 60.
  • the configuration of the optical waveguide device 28 shown in FIG. 5 is advantageously used in combination with a laser device 26 according to the invention configured in accordance with FIG.
  • no centering or corresponding focusing optics or coupling optics 40 for coupling the trigger radiation 60 'into the laser device 26 is required due to the central arrangement of the central optical fiber 28c guiding the trigger radiation 60'.
  • a homogeneous pumping light distribution in the laser device 26 is achieved by the symmetrical arrangement of the further optical fibers 28d provided radially on the outside.
  • FIG. 6 shows a further advantageous embodiment of the laser device 26 according to the invention.
  • the laser device 26 according to FIG. 6 has a deflection mirror 41, via which pump light 60 can be irradiated by means of reflection into the laser device 26, as shown in FIG has relatively high transmission coefficients for the light of the laser pulse 24 in order to enable efficient decoupling of the laser pulse 24 from the laser device 26.
  • the triggering radiation 60 'provided according to the invention is not coupled in the same region of the laser device 26 as the pumping light 60, but in the present case, for example, directly in the region of the passive Q-switching circuit 46, i. on the left in FIG. 6, which avoids an otherwise possibly occurring, disturbing absorption of the trigger radiation 60 'in the laser-active solid 44, which only led to a reduction of the radiation density of the trigger radiation 60' in the region of the passive Q-switching 46.
  • the trigger radiation 60 ' can be supplied, analogously to the embodiments described with reference to FIGS. 2 and 4a, either via an optical waveguide device (not shown) provided for this purpose;
  • a corresponding light source in particular a laser light source, preferably a semiconductor laser diode, which is provided directly in the region of the laser device 26, in particular directly in the region of the passive Q-switching circuit 46.
  • the components forming the laser resonator 42, 44, 46, 48 whereby a monolithic arrangement of the laser device 26 is obtained.
  • This monolithic arrangement of the laser device 26 can advantageously also be assigned directly to a semiconductor laser diode which generates the trigger radiation 60 '.
  • the laser device 26 according to the invention is particularly suitable for use in an ignition device 27 (FIG. 1) of an internal combustion engine 10 of a motor vehicle, but can also be advantageously used in connection with stationary engines.
  • the inventive principle allows the targeted generation of laser pulses 24 by means of the passively Q-switched laser device 26, wherein in particular the time of generation of the laser pulse 24 directly depends on a temporal position tl of the inventively provided trigger pulse 24 ', so that existing in conventional systems uncertainty the time of generation of the laser pulse 24 is eliminated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lasers (AREA)

Abstract

L'invention concerne un procédé pour faire fonctionner un dispositif laser (26) qui présente un milieu actif solide (44) à dispositif de déclenchement passif (46). Selon ce procédé, le dispositif laser (26) est soumis à l'action d'une lumière de pompage (60) pour produire une impulsion laser (24). Selon l'invention, le dispositif laser (26) est en outre soumis à l'action d'un rayonnement de déclenchement (60') pour faire passer le dispositif de déclenchement passif (46) dans un état de transmission élevée à un moment (t1) prédéfini. Le moment de l'émission de l'impulsion laser (24) peut ainsi être prédéfini avec précision.
PCT/EP2008/059309 2007-09-05 2008-07-16 Procédé pour faire fonctionner un dispositif laser WO2009030550A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710042223 DE102007042223A1 (de) 2007-09-05 2007-09-05 Verfahren zum Betreiben einer Lasereinrichtung
DE102007042223.9 2007-09-05

Publications (1)

Publication Number Publication Date
WO2009030550A1 true WO2009030550A1 (fr) 2009-03-12

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Application Number Title Priority Date Filing Date
PCT/EP2008/059309 WO2009030550A1 (fr) 2007-09-05 2008-07-16 Procédé pour faire fonctionner un dispositif laser

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DE (1) DE102007042223A1 (fr)
WO (1) WO2009030550A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11482831B2 (en) * 2017-09-05 2022-10-25 National Institutes for Quantum Science and Technology Laser device, light source, and measurement apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009028337A1 (de) * 2009-08-07 2011-02-10 Robert Bosch Gmbh Laserzündeinrichtung und Betriebsverfahren hierfür

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006125685A1 (fr) * 2005-05-27 2006-11-30 Robert Bosch Gmbh Dispositif d'allumage pour moteur a combustion interne
WO2007018675A2 (fr) * 2005-05-23 2007-02-15 Newport Corporation Appareil a laser pulse et procede d'utilisation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007018675A2 (fr) * 2005-05-23 2007-02-15 Newport Corporation Appareil a laser pulse et procede d'utilisation
WO2006125685A1 (fr) * 2005-05-27 2006-11-30 Robert Bosch Gmbh Dispositif d'allumage pour moteur a combustion interne

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11482831B2 (en) * 2017-09-05 2022-10-25 National Institutes for Quantum Science and Technology Laser device, light source, and measurement apparatus
US12027814B2 (en) 2017-09-05 2024-07-02 National Institutes for Quantum Science and Technology Laser device, light source, and measurement apparatus, and method for using a laser device

Also Published As

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