CN103532005A - Staggered parallel connection beam combing method for realizing high-power output of all-solid-state lasers - Google Patents
Staggered parallel connection beam combing method for realizing high-power output of all-solid-state lasers Download PDFInfo
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- 239000007787 solid Substances 0.000 claims description 63
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Abstract
The invention relates to a staggered parallel connection beam combing method for realizing high-power output of all-solid-state lasers. The method comprises the following steps that 1, an all-solid-state laser with an equivalent resonant cavity is designed; 2, the staggered parallel connection beam combination of two independent all-solid-state lasers is carried out; and 3, the staggered parallel connection beam combination of N independent all-solid-state lasers is carried out. The staggered parallel connection beam combing method has the advantages that the laser emitted by the N independent all-solid-state lasers can be output in the same emitting optical axis, the same girdling position and the same emitting angle in a superposed way, the N-times amplification of the power is realized, and in addition, through the reflection and the transmission of a 45-degree coupling output mirror on the laser, the energy coupling is built among the N all-solid-state lasers. When the condition occurs, the partial interference effect is formed in a laser beam output by a combined beam, and the laser light beam quality after the beam combination is equal to or higher than the light beam quality of the single all-solid-state laser.
Description
Technical field
The present invention relates to a kind of dislocation association bundle method that realizes all solid state laser power expansion, belong to Solid State Laser technical field.
Background technology
All solid state laser refers to the solid state laser of semiconductor laser pumping, have the advantages such as efficiency is high, life-span length, good beam quality, compact conformation, the process unit based on such laser is widely used in the fields such as automobile, railway, boats and ships, metallurgy, petrochemical industry, national defence and Aero-Space.
At present generally in series by several laser cell modules for the high power all solid state laser of industrial processes, the mode of amplifying by resonance or resonance realizes high-power output, has the advantages such as simple in structure, easy realization.Laser module is the critical piece that forms all solid state laser, by tens to up to a hundred semiconductor lasers, to line up ring-type to carry out pumping from the side of crystal bar, by the semiconductor laser light source of Rational Arrangement pumping, on the cross section of crystal bar, form and be from inside to outside parabolic gain profiles.Semiconductor laser as pumping source extends the situation that has red shift of wavelength or power attenuation with service time, tens semiconductor lasers generally can synchronously not change in time, indivedual semiconductor lasers even there will be random failure, the randomness that this pump light source changes can cause crystal bar pumping homogeneity to change, and minor shifts occurs at gain center.This small skew can cause the skew of the optical axis generation minute angle of laser in cascaded structure, thereby affects stability and the reliability of whole laser system.In commercial Application, as stability and the reliability that in the high power all solid state laser of laser processing equipment light source, a most important index is system.
" a kind of also association bundle method that realizes all solid state laser high-power output " (publication number: 2013102561881) of the applicant's application, be by the N laser that independently all solid state laser sends with identical transmitting optical axis, identical beam waist position and identical angle of divergence stack output, realize power N stack doubly.The present invention adopts that dislocation is in parallel can will can obtain same output effect, but has reduced the optical element adopting while realizing beam combination, make laser debug easier, structure is compacter, reliability is higher.
Summary of the invention
In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a kind of brand-new power expansion method---dislocation association bundle, that can realize a plurality of independent all solid state laser outgoing laser beams closes bundle completely, make the laser that various lasers is sent export, and close and restraint the beam quality that the laser beam quality of exporting is not less than single laser Output of laser with identical optical axis, identical beam waist position and size, identical angle of divergence stack.
To achieve these goals, technical scheme of the present invention realizes by following steps: a kind of dislocation association bundle method that realizes all solid state laser high-power output, comprises the following steps: all solid state laser that 1) designs an equivalent resonant cavity; 2) dislocation of 2 independent all solid state lasers association bundle; 3) dislocation the association bundle of N independent all solid state laser; It is characterized in that:
1), design all solid state laser of an equivalent resonant cavity: the lens (15) and 1 laser head (16) that 3 high reflective mirrors (11,12,13), 1 output coupling mirror (14), 1,1 or multi-disc, consist of form, the distance L of the spot center on output coupling mirror (14) and high reflective mirror (12)
11between 20～380mm, the distance L of the upper spot center of lens (15) and output coupling mirror (14)
12and the distance L between high reflective mirror (13) and lens (15)
13by following mathematical relationship, determined:
L
12=f
1-L
11and L
13=f
1
2), dislocation the association bundle of 2 independent all solid state lasers: the 2nd all solid state laser of transverse shifting, makes lateral separation L between the 2nd all solid state laser high reflective mirror (22) and the 1st all solid state laser high reflective mirror (12)
22, and distance L between the 1st all solid state laser (1) and the 2nd all solid state laser (2)
1equate,
L
22=L
1
And the distance L of spot center and high reflective mirror (12) on output coupling mirror (14) coated surface
11distance L with spot center and high reflective mirror (22) on output coupling mirror (24) coated surface
21by following mathematical relationship, determined:
|L
11-L
21|=L
1
3), dislocation the association bundle of N independent all solid state laser: n all solid state laser of transverse shifting, makes lateral separation L between n all solid state laser high reflective mirror (n2) and n-1 all solid state laser high reflective mirror ((n-1) 2)
n2, and distance L between n all solid state laser (n) and n-1 all solid state laser (n-1)
n-1by following mathematical relationship, determined:
L
n2=L
n-1
And the distance L of spot center and high reflective mirror (n2) on output coupling mirror (n4) coated surface
n1distance L with spot center and high reflective mirror ((n-1) 2) on output coupling mirror ((n-1) 4) coated surface
(n-1) 1by following mathematical relationship, determined:
|L
(n-1)1-L
n1|=L
n-1。
The present invention, not only can be by the N laser that independently all solid state laser sends with identical transmitting optical axis, identical beam waist position and identical angle of divergence stack output, realize power N amplification doubly, and because 45 ° of output coupling mirrors are to swashing reflection of light and transmission, will between N all solid state laser, set up Energy Coupling.The generation of this kind of situation is forming section interference effect in closing the laser beam of bundle output, makes to close the beam quality that laser beam quality after bundle equals or be better than single all solid state laser.
Accompanying drawing explanation
Fig. 1 is equivalent resonant cavity schematic diagram of the present invention.
Fig. 2 is the schematic diagram of two independent all solid state lasers of the present invention association bundle.
Fig. 3 is the reflectivity of 45 ° of output coupling mirrors in equivalent resonant cavity of the present invention and the corresponding relation figure of average resonant cavity output coupling mirror reflectivity.
Fig. 4 is the schematic diagram of N of the present invention independent all solid state laser association bundle.
Fig. 5 is 2 independent all solid state lasers providing of embodiments of the invention the pumping current and the relation of closing bundle power output of association bundle.
Fig. 6 is 3 independent all solid state lasers providing of embodiments of the invention the pumping current and the relation of closing bundle power output of association bundle.
In figure: n. all solid state laser; N1. high reflective mirror; N2. high reflective mirror; N3. high reflective mirror; N4. output coupling mirror; N5. lens; N6. laser head; N7. lens; (above n is desirable 1,2,3 ..., N).
Specific embodiment
The present embodiment is referring to Fig. 1～Fig. 4, adopts DPLM40-81 laser head (n6) that my company produces, commercial the lens (15) that 0 ° of incidence reflection rate of 1064nm laser is greater than 99.8% high reflective mirror (n1, n2, n3), the anti-reflection focal length of output coupling mirror (n4) and surface that is 16% to 45 ° of incidence reflection rates of 1064nm laser is 300mm are built to 2 all solid state lasers realize also association bundle.
1, the realization of the average cavity resonator structure of first all solid state laser equivalence
1) to select the physics chamber of average resonant cavity of equivalence long be 800mm to this example, so the distance between high reflective mirror (11), (12) is 800mm.
2) determine the parameter of output coupling mirror (14) and lens (15).The angle of the central axis of the crystal bar in output coupling mirror surface normal and laser head (16) is 45 °, it is chosen with reference to figure 2 reflectivity of laser, because the reflectivity of the output coupling mirror of average resonant cavity equivalent in this example is 30%, the reflectivity of therefore choosing output coupling mirror (14) is 18%(Fig. 3); It is f that lens in this example (15) are selected focal length
1the einzel lens of=300mm.
3) determine optical mirror slip location parameter.According to mathematical relationship described in step 1, select L
11=270mm, L
12=30mm and L
13=300mm.
2, the realization of 2 independent all solid state lasers association bundle
Determine the location parameter of two all solid state lasers (1,2).This example is selected L
1=120mm, is known by step 2, L
21=150mm, L
22=120mm.The relation curve that closes bundle power output and pumping current that the present embodiment provides as shown in Figure 5.Wherein all solid state laser 1 and 2 peak power outputs are respectively 0.715kW and 0.654kW, close bundle power output and are 1.25kW to the maximum, close bundle efficiency and equal 91.3%.
3, the realization of 3 independent all solid state lasers association bundle
Determine the location parameter of 3 all solid state lasers (1,2,3).This example is selected L
1=L
2=120mm, L
11=270mm, L
12=30mm, L
13=300mm, is known by step 2, L
21=150mm, is known by step 3, L
31=30mm, L
32=120mm.The relation curve that closes bundle power output and pumping current that the present embodiment provides as shown in Figure 6.Wherein all solid state laser 1,2 and 3 peak power outputs are respectively 0.715kW, 0.654kW, and 0.667kW closes bundle power output and is 1.82kW to the maximum, closes bundle efficiency and equals 89.3%.
The high power all solid state laser that utilizes the method to realize can be realized modular construction, the pumping homogeneity that can effectively reduce single laser module changes the impact on complete machine, be conducive to improve stability and the reliability of complete machine, to realizing the high power of technical grade, high reliability, to be easy to the modularization all solid state laser safeguarded significant.Advantage of the present invention is to adopt less optical element to obtain identical power output and beam quality, and laser structure is compacter, and reliability is higher.
Claims (1)
1. the dislocation the association bundle method that realize all solid state laser high-power output, comprise the following steps: all solid state laser that 1) designs an equivalent resonant cavity; 2) dislocation of 2 independent all solid state lasers association bundle; 3) dislocation the association bundle of N independent all solid state laser; It is characterized in that:
1), design all solid state laser of an equivalent resonant cavity: the lens (15) and 1 laser head (16) that 3 high reflective mirrors (11,12,13), 1 output coupling mirror (14), 1,1 or multi-disc, consist of form, the distance L of the spot center on output coupling mirror (14) and high reflective mirror (12)
11between 20～380mm, the distance L of the upper spot center of lens (15) and output coupling mirror (14)
12and the distance L between high reflective mirror (13) and lens (15)
13by following mathematical relationship, determined:
L
12=f
1-L
11and L
13=f
1
2), dislocation the association bundle of 2 independent all solid state lasers: the 2nd all solid state laser of transverse shifting, makes lateral separation L between the 2nd all solid state laser high reflective mirror (22) and the 1st all solid state laser high reflective mirror (12)
22, and distance L between the 1st all solid state laser (1) and the 2nd all solid state laser (2)
1equate,
L
22=L
1
And the distance L of spot center and high reflective mirror (12) on output coupling mirror (14) coated surface
11distance L with spot center and high reflective mirror (22) on output coupling mirror (24) coated surface
21by following mathematical relationship, determined:
|L
11-L
21|=L
1
3), dislocation the association bundle of N independent all solid state laser: n all solid state laser of transverse shifting, makes lateral separation L between n all solid state laser high reflective mirror (n2) and n-1 all solid state laser high reflective mirror ((n-1) 2)
n2, and distance L between n all solid state laser (n) and n-1 all solid state laser (n-1)
n-1by following mathematical relationship, determined:
L
n2=L
n-1
And the distance L of spot center and high reflective mirror (n2) on output coupling mirror (n4) coated surface
n1distance L with spot center and high reflective mirror ((n-1) 2) on output coupling mirror ((n-1) 4) coated surface
(n-1) 1by following mathematical relationship, determined:
|L
(n-1)1-L
n1|=L
n-1。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006738A (en) * | 2015-08-12 | 2015-10-28 | 广州安特激光技术有限公司 | Parallel connection end-pumped series amplifying high-power laser |
| CN105006732A (en) * | 2015-08-12 | 2015-10-28 | 广州安特激光技术有限公司 | Medium and small power LD parallelly pumped high-power green laser |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040067016A1 (en) * | 2002-10-07 | 2004-04-08 | Anikitchev Serguei G. | Method and apparatus for coupling radiation from a stack of diode-laser bars into a single-core optical fiber |
| CN201177693Y (en) * | 2008-04-07 | 2009-01-07 | 北京工业大学 | A high-power semiconductor laser beam recombination device |
| CN103326230A (en) * | 2013-06-25 | 2013-09-25 | 江苏中科四象激光科技有限公司 | Parallel beam-combining method for achieving all-solid-state laser high-power output |
-
2013
- 2013-10-21 CN CN201310496020.8A patent/CN103532005A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040067016A1 (en) * | 2002-10-07 | 2004-04-08 | Anikitchev Serguei G. | Method and apparatus for coupling radiation from a stack of diode-laser bars into a single-core optical fiber |
| CN201177693Y (en) * | 2008-04-07 | 2009-01-07 | 北京工业大学 | A high-power semiconductor laser beam recombination device |
| CN103326230A (en) * | 2013-06-25 | 2013-09-25 | 江苏中科四象激光科技有限公司 | Parallel beam-combining method for achieving all-solid-state laser high-power output |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105006738A (en) * | 2015-08-12 | 2015-10-28 | 广州安特激光技术有限公司 | Parallel connection end-pumped series amplifying high-power laser |
| CN105006732A (en) * | 2015-08-12 | 2015-10-28 | 广州安特激光技术有限公司 | Medium and small power LD parallelly pumped high-power green laser |
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Application publication date: 20140122 |