CN102118004A - Device and method for improving asymmetric output beams of wattle type solid laser - Google Patents
Device and method for improving asymmetric output beams of wattle type solid laser Download PDFInfo
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- CN102118004A CN102118004A CN 200910244443 CN200910244443A CN102118004A CN 102118004 A CN102118004 A CN 102118004A CN 200910244443 CN200910244443 CN 200910244443 CN 200910244443 A CN200910244443 A CN 200910244443A CN 102118004 A CN102118004 A CN 102118004A
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Abstract
The invention discloses a device and method for improving asymmetric output beams of a wattle type solid laser, wherein the symmetry of the output beams is realized by adopting a resonant cavity structure which is provided with a totally reflecting mirror, output mirrors and a laser medium; the radii of the beams on the laser medium are changed through adjusting the length of a long arm of the resonant cavity so that the optimum matching between a resonant cavity mode and a pumping mode is obtained; and the position of a second stable region is changed by adjusting the length of a short arm of the resonant cavity to ensure that a dynamic working point of the laser medium in the width direction is in a first stable region, a dynamic working point of the laser medium in the thickness direction is in the second stable region, the sizes of the light spots on the output mirrors in two directions are same, and therefore, parameters such as waist positions, waist sizes, divergence angles and the like of the laser output beams are same, that is to say, the symmetry of the laser output beams is realized. In the invention, the structure is simple, the realization is easy and the problem that the output beams of the wattle type solid laser are asymmetric is effectively solved.
Description
Technical field
The invention belongs to the laser technique field, be specifically related to a kind of asymmetric method of strip type solid laser output beam of improving.
Background technology
Solid state laser has obtained extensive use in the every field of national economy.
In general, thermal effect such as birefringence can appear that twin shaft that hot focus, stress cause focuses on and in the cylindrical bar-shaped laser medium of heat load, and the beam quality of laser output is caused the laser power that has a strong impact on and limit output.
For the solid state laser of strip type structure, can be by " it " font (zig-zag) light path reasonable in design, alleviate even eliminate single order thermal lens, stress birfringence and fevering sodium effect, thereby obtain the power output of better beam quality and Geng Gao.
The method for pumping of strip type solid laser generally has several forms such as end pumping, profile pump, edge pumping and angle pumping.The shape of laser medium is generally the hexahedron of rectangle or parallelogram section.Except holding heat sink reaching the symmetry heat radiation by adding around the square sectional laser medium in end pumping, other several pump modes adopt wherein two the big faces and the heat sink asymmetric radiating mode that contacts in the laser medium usually.In this case, the temperature gradient of heat dissipation direction (being the thickness direction of laser medium) is big more a lot of than adiabatic direction (being the Width of laser medium), and then causes the thermal focal of thickness direction littler than the Width.This thermal focal has caused the eigenmodes difference of resonant cavity two directions in the asymmetry of both direction, has finally caused the asymmetric of laser output beam, has influenced strip type solid laser practical application in some respects.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide a kind of asymmetric method of strip type solid laser output beam of improving, realize a kind of symmetrization of strip type solid laser output beam with simple cavity resonator structure.
For achieving the above object, the present invention takes following technical scheme: adopt level crossing as total reflective mirror and outgoing mirror, long-armed with resonant cavity as output, regulate the beam radius on the long-armed length change of the described resonant cavity laser medium, obtain best pattern matching; Regulate described resonant cavity galianconism length and change the second steady zone position (being variation when focal power get the relatively big numerical value formed concave regions of laser medium fundamental-mode gaussian beam beamwidth) with the laser medium focal power, make described laser medium Width (thermal focal is big) dynamic working point be in first and surely distinguish (being variation when focal power get the relatively little numerical value formed concave regions of laser medium fundamental-mode gaussian beam beamwidth) with the laser medium focal power, described laser medium thickness direction (thermal focal is little) dynamic working point is in the second steady district, and makes on the two direction outgoing mirrors spot size identical.Because level crossing is vibration light beam and output beam beam waist position in the chamber simultaneously, as long as guarantee that two direction spot sizes are identical on the described outgoing mirror, can guarantee that then parameters such as laser output beam beam waist position, size with a tight waist and the angle of divergence are identical, promptly realize the symmetrization of laser output beam.
A kind of asymmetric device of strip type solid laser output beam that improves of the present invention's design, described device is a cavity resonator structure, it is characterized in that, is provided with the total reflective mirror of coaxial placement in the described resonant cavity, outgoing mirror and laser medium; Described total reflective mirror is positioned at described laser medium the place ahead, and distance between the two is the galianconism length of described resonant cavity; Described outgoing mirror is positioned at the rear of described laser medium, and distance between the two is the long-armed length of described resonant cavity.
Wherein, described total reflective mirror and outgoing mirror are level crossing.
Wherein, described laser medium is shaped as strip type.
Wherein, described laser medium is a kind of in laser crystal, laser glass medium, laser plastic medium and the laser ceramics medium.
Wherein, also be provided with the sphere of coaxial placement or cylindrical lens, speculum, Q switching in the described resonant cavity, or the laser nonlinear crystal.
In addition, the invention still further relates to a kind of asymmetric method of strip type solid laser output beam of improving, it is characterized in that, comprise the steps:
S1, the long-armed length of the described resonant cavity of adjusting change the basement membrane Gaussian beam beamwidth ω on the laser medium
3, make it and described laser pumping pattern matching, improve pattern matching efficient;
S2, the described resonant cavity galianconism length of adjusting change laser medium fundamental-mode gaussian beam beamwidth ω
3Variation formed second steady zone position when focal power D gets big relatively numerical value with laser medium focal power D makes the dynamic working point of described laser medium Width be in laser medium fundamental-mode gaussian beam beamwidth ω
3With the variation of the laser medium focal power D formed first steady district when focal power D gets relatively little numerical value, the dynamic working point of described laser medium thickness direction is in described second surely to be distinguished, and makes the laser medium Width identical with formed spot size on the thickness direction outgoing mirror.
Wherein, the pump mode of described laser is the end pumping of profile pump, edge pumping, angle pumping, asymmetric heat radiation or asymmetric pumping.
Wherein, the change method of the described second steady zone position is dwindled the surely interval in district, the described first steady district and second for the galianconism length that increases described resonant cavity, and the galianconism length that perhaps reduces described resonant cavity increases the described first steady district and the second steady interval of distinguishing.
Compared with prior art, the outstanding advantage that the present invention possessed has: simple in structure, be easy to realize, and can effectively solve the asymmetric problem of strip type solid laser output beam.
Description of drawings
Fig. 1 is the structural representation that the present invention improves the asymmetric device of strip type solid laser output beam;
Fig. 2 is that the present invention improves the asymmetric method operation principle of strip type solid laser output beam schematic diagram.
Wherein, 1: total reflective mirror; 2: outgoing mirror; 3: laser medium.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples are used to illustrate the present invention, but are not used for limiting the scope of the invention.
In the present embodiment, adopt the resonant cavity that only contains laser medium in the chamber to set forth design philosophy of the present invention.As shown in Figure 1, the structure that the present invention improves the asymmetric device of strip type solid laser output beam comprises total reflective mirror 1, outgoing mirror 2 and strip type laser medium 3, and the direction of the heavy clamping laser medium heat radiation of heat-obtaining is the y direction, perpendicular is the x direction.Under certain resonant cavity brachium, outgoing mirror fundamental-mode gaussian beam beamwidth ω
2With laser medium fundamental-mode gaussian beam beamwidth ω
3With the change curve of laser medium (being thermal lens) focal power D as shown in Figure 2, ω wherein
3Two concave regions of curve are exactly two steady districts of laser operation.The hot focal power of laser medium x and y direction when having marked the output of laser under certain pump power with dotted line among the figure, its intersection point with solid line and dotted line is the ω of this direction just
3And ω
2As seen from Figure 2, two direction laser output ω
2Unequal is owing to different the causing in the position of two direction dynamic working points in steady district.
Regulate long-armed length d
2Change thermal lens and be the fundamental-mode gaussian beam beamwidth ω on the laser medium
3, make it and the laser pumping pattern matching, thereby obtain higher pattern matching efficient.On the other hand, can be by increasing the galianconism length d
1Dwindle steady interval every or by reducing the galianconism length d
1Increase steady interval every, thereby move the second steady district in the X direction of Fig. 2 because the hot focal power D of laser medium y direction
yRemain unchanged, like this with regard to the position of intersecting point that makes dotted line and blue line with the moving of the second steady district, that is to say the y direction spot radius ω on the outgoing mirror
2yCan be with d
1Change; Simultaneously when the long-armed length d of resonant cavity
2When determining, steady sector width is fixed thereupon, and therefore the position and the width in the first steady district are constant, simultaneously the hot focal power D of laser medium x direction
xRemain unchanged, that is to say the x direction spot radius ω on the outgoing mirror
2xRemain unchanged.Can see that from the example of Fig. 2 ω is arranged
2y＜ω
2x, at this moment reduce resonant cavity galianconism length d
1, the second steady district is moved right to increase ω
2yBecause ω
2Change continuously, so we can find a suitable d
1Make ω
2y=ω
2x, so to export the waist width of two directions identical for laser, and at same position, also just guaranteed the symmetry of laser output.
The foregoing description has just provided the simplest example that contains the laser medium resonant cavity, does not describe all possibilities.In fact, can also in resonant cavity, place sphere or cylindrical lens lens and speculum, perhaps resonant cavity element such as Q switching and various laser nonlinear crystals, as long as surely distinguish by changing the adjustment of resonant cavity brachium, finally make the laser of strip type solid laser export two direction symmetries, be the scope that the present invention is contained.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the technology of the present invention principle; can also make some improvement and replacement, these improvement and replacement also should be considered as protection scope of the present invention.
Claims (8)
1. one kind is improved the asymmetric device of strip type solid laser output beam, and described device is a cavity resonator structure, it is characterized in that, is provided with the total reflective mirror (1) of coaxial placement in the described resonant cavity, outgoing mirror (2) and laser medium (3); Described total reflective mirror (1) is positioned at described laser medium (3) the place ahead, and distance between the two is the galianconism length of described resonant cavity; Described outgoing mirror (2) is positioned at the rear of described laser medium (3), and distance between the two is the long-armed length of described resonant cavity.
2. the asymmetric device of strip type solid laser output beam that improves as claimed in claim 1 is characterized in that described total reflective mirror (1) and outgoing mirror (2) are level crossing.
3. the asymmetric device of strip type solid laser output beam that improves as claimed in claim 1 is characterized in that, described laser medium (3) be shaped as strip type.
4. the asymmetric device of strip type solid laser output beam that improves as claimed in claim 1 is characterized in that, described laser medium (3) is a kind of in laser crystal, laser glass medium, laser plastic medium and the laser ceramics medium.
5. the asymmetric device of strip type solid laser output beam that improves as claimed in claim 1 is characterized in that, also is provided with the sphere of coaxial placement or cylindrical lens, speculum, Q switching in the described resonant cavity, or the laser nonlinear crystal.
6. one kind is improved the asymmetric method of strip type solid laser output beam, it is characterized in that, comprises the steps:
S1, the long-armed length of the described resonant cavity of adjusting change the basement membrane Gaussian beam beamwidth ω on the laser medium
3, make it and described laser pumping pattern matching, improve pattern matching efficient;
S2, the described resonant cavity galianconism length of adjusting change laser medium fundamental-mode gaussian beam beamwidth ω
3Variation formed second steady zone position when focal power D gets big relatively numerical value with laser medium focal power D makes the dynamic working point of described laser medium Width be in laser medium fundamental-mode gaussian beam beamwidth ω
3With the variation of the laser medium focal power D formed first steady district when focal power D gets relatively little numerical value, the dynamic working point of described laser medium thickness direction is in described second surely to be distinguished, and makes the laser medium Width identical with formed spot size on the thickness direction outgoing mirror.
7. the asymmetric method of strip type solid laser output beam of improving as claimed in claim 6 is characterized in that the pump mode of described laser is the end pumping of profile pump, edge pumping, angle pumping, asymmetric heat radiation or asymmetric pumping.
8. the asymmetric method of strip type solid laser output beam of improving as claimed in claim 6, it is characterized in that, the change method of the described second steady zone position is dwindled the surely interval in district, the described first steady district and second for the galianconism length that increases described resonant cavity, and the galianconism length that perhaps reduces described resonant cavity increases the described first steady district and the second steady interval of distinguishing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910244443 CN102118004B (en) | 2009-12-31 | 2009-12-31 | Method for improving asymmetric output beams of wattle type solid laser |
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|---|---|---|---|
| CN 200910244443 CN102118004B (en) | 2009-12-31 | 2009-12-31 | Method for improving asymmetric output beams of wattle type solid laser |
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| CN102118004A true CN102118004A (en) | 2011-07-06 |
| CN102118004B CN102118004B (en) | 2012-12-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114498255A (en) * | 2022-02-16 | 2022-05-13 | 中国人民解放军国防科技大学 | Unstable cavity laser with adjustable thermal stable region and method thereof |
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|---|---|---|---|---|
| US7039087B2 (en) * | 2004-05-13 | 2006-05-02 | The United States Of America As Represented By The Department Of The Army | End pumped slab laser cavity |
| CN1671012A (en) * | 2005-04-15 | 2005-09-21 | 清华大学 | Lath structure type solid-state laser in edge rounding pumping form |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114498255A (en) * | 2022-02-16 | 2022-05-13 | 中国人民解放军国防科技大学 | Unstable cavity laser with adjustable thermal stable region and method thereof |
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