CN101806958A - Central part reconstruction method and device of unstable resonator laser annular beam - Google Patents
Central part reconstruction method and device of unstable resonator laser annular beam Download PDFInfo
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- CN101806958A CN101806958A CN201010111202A CN201010111202A CN101806958A CN 101806958 A CN101806958 A CN 101806958A CN 201010111202 A CN201010111202 A CN 201010111202A CN 201010111202 A CN201010111202 A CN 201010111202A CN 101806958 A CN101806958 A CN 101806958A
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Abstract
The invention provides a central part reconstruction method and a device of an unstable resonator laser annular beam. The method comprises: an annular beam output by an unstable resonator laser is guided by an inner round table surface annular reflecting mirror and is gradually concentrated towards the optical axis position of the laser; the light beam concentrated on the periphery of the optical axis is reguided by utilizing an external cone surface reflecting mirror to obtain a reshaped light beam output along the optical axis direction; and the relative position of the inner round table surface annular reflecting mirror and the external cone surface reflecting mirror along the optical axis direction is precisely adjusted to realize the circular solid reshaping light beam output along the optical axis direction. The device comprises the unstable resonator laser, the inner round table surface annular reflecting mirror, the external cone surface reflecting mirror, a precise displacement mechanism of the inner round table surface annular reflecting mirror and a precise displacement mechanism of the external cone surface reflecting mirror. Compared with the prior art, the method can utilize an extracavity optical element to change the annular beam output by the unstable resonator laser and obtain circular solid light beam output. The provided device has simple structure and stable operation.
Description
Technical field
The invention belongs to superpower laser beam shaping technical field, particularly a kind of central part reconstruction method and device of exporting annular beam based on the unstable cavity laser of chamber outer light beam shaping technique.
Background technology
Superpower laser with high light beam quality all has very important application prospect in industry and Military Application field! For superpower laser, how to obtain big as far as possible model volume and good transverse mode distinguishing ability, realizing the running of high power single mode, thus can be from active medium high efficiency extraction energy, it is vital keeping the laser output of high light beam quality again! In order to obtain high-power laser output, often need to adopt the active medium of large volume and big lateral dimension, under the optical element prerequisite that Stimulated Light is damaged in the assurance chamber, realize high-power laser output.
Stable cavity can only obtain to operate at basic mode (TEM at the optical axis center near zone
00The Gaussian beam of nearly diffraction limit mould), its model volume is limited, and is not suitable for superpower laser.
To having the laser instrument of large volume and big lateral dimension active medium, general both at home and abroad employing unsteady cavity technology obtains single transverse mode and exports.But the coupling of conventional unstable cavity laser is output as the ring-shaped light spot structure, and after this annular hollow beam is focused on, the power density of its focal spot center will be more much lower than the solid light beam with equal-wattage and spot size; Similarly, the far-field divergence angle of this annular hollow beam also will finally limit its application far above diffraction limit.
In order to eliminate the central blackening of conventional unstable cavity laser output annular beam, people have proposed many diverse ways, in the hope of realize extracting the high energy laser beam near diffraction limit from the large volume active medium.The most representative variable reflectivity mirror (common comprise Gaussian, super Gaussian, parabolic type etc.) unsteady cavity and 90 ° of bundle rotary annular unsteady cavities (90 ° of Beam Rotation of Unstable Resonator with) of surely belonging to.
Adopt the unsteady cavity of variable reflectivity mirror, can reach the high energy laser beam output of nearly diffraction limit in theory as output coupling mirror.But for superpower laser, the reflectivity-variable dielectric film of making high damage threshold is very difficult; And different dielectric film thickness also can cause the phase distortion of output beam, so the reflectivity-variable output coupling mirror has certain limitation in practical application.
People such as USAF Weapons Laboratory A.H.Paxton have proposed a kind of 90 ° of bundle rotary annular unsteady cavities in " Applied Optics " 1986 the 25th volumes the 17th phase " 90 ° of beam rotation of Unstable resonators with " literary composition, this chamber has been owing to utilized the light beam rotation technique can be to the unevenness of active medium and the averaging of aberration of minute surface, thereby obtains the full spot laser beam output of rectangle of high light beam quality.But because the output coupling mirror in this chamber is the edge of a knife, output beam is a Filled Rectangle, in strong infrared laser transmission, can only adopt the emission of inclined shaft shape reflecting telescope; And the design difficulty of inclined shaft reflecting telescope is big, involves great expense.
Summary of the invention
The purpose of this invention is to provide a kind of central part reconstruction method and device of exporting annular beam based on the unstable cavity laser of chamber outer light beam shaping technique.Its ultimate principle is as follows: the annular hollow beam of unstable cavity laser output is concentrated to the optical axis position of laser instrument after interior round table surface Perimeter Truss Reflector guiding gradually; Utilize with described in the outer conical surface catoptron of round table surface Perimeter Truss Reflector with same axis cross section drift angle near the light beam that concentrates on the laser optical axis is led again, export along the shaping light beam of optical axis direction transmission obtaining; Carry out minute adjustment by internal round table surface Perimeter Truss Reflector and outer conical surface catoptron along the relative position of optical axis direction, realize circular solids shaping light beam output along the optical axis direction transmission.
For achieving the above object, the technical solution used in the present invention is:
A kind of central part reconstruction method of unstable cavity laser output annular beam comprises the steps:
A. the round table surface Perimeter Truss Reflector leads to the annular hollow beam of unstable cavity laser output in utilizing, and makes it to concentrate to the optical axis position of laser instrument gradually;
B. utilize the outer conical surface catoptron that near the above-mentioned light beam that concentrates on the laser optical axis is led again, obtain shaping light beam output along the optical axis direction transmission;
C. interior round table surface Perimeter Truss Reflector and outer conical surface catoptron are carried out minute adjustment along the relative position of optical axis direction, obtain circular solids shaping light beam output along the optical axis direction transmission.
In of the present invention the rotation axes of symmetry of round table surface Perimeter Truss Reflector and outer conical surface catoptron all with the light shaft coaxle of described unstable cavity laser.
The round table surface Perimeter Truss Reflector has identical shaft section drift angle with the outer conical surface catoptron in of the present invention.
Shaft section drift angle of the present invention can be acute angle, right angle or obtuse angle.
Round table surface Perimeter Truss Reflector and outer conical surface catoptron all have accurate displacement mechanism in of the present invention, and the minute adjustment described in the step C realizes by regulating above-mentioned accurate displacement mechanism.
A kind of device of realizing the central part reconstruction method of above-mentioned annular beam comprises unstable cavity laser, interior round table surface Perimeter Truss Reflector, outer conical surface catoptron, interior round table surface Perimeter Truss Reflector accurate displacement mechanism and outer conical surface catoptron accurate displacement mechanism.
The round table surface Perimeter Truss Reflector has identical shaft section drift angle with the outer conical surface catoptron in of the present invention.
Shaft section drift angle of the present invention can be acute angle, right angle or obtuse angle.
The rear portion of round table surface Perimeter Truss Reflector has the first annular cooling water groove in of the present invention, has the annular water tank cover plate of water inlet and water delivering orifice and the bottom of described interior round table surface Perimeter Truss Reflector and adopts welding manner to be tightly connected.
The rear portion of outer conical surface catoptron of the present invention has the second annular cooling water groove, has the circular channels cover plate of water inlet and water delivering orifice and the bottom of described outer conical surface catoptron and adopts welding manner to be tightly connected.
The compared with prior art main following advantage of tool of the present invention:
(1) (big in the conventional unsteady cavity plurality of advantages of reservation as model volume, transverse mode resolution is high) prerequisite under, utilize chamber external reflection formula optical element that the core of unstable cavity laser output annular beam is reconstructed, to realize the high energy circular solids laser beam output of high light beam quality.
(2) relate generally to the application of reflection type optical element, so it can bear very high laser power, be suitable for the beam shaping of high power laser light application scenario.
(3) reflection type optical element processing involved in the present invention is simple and convenient, low cost of manufacture.
In a word, the present invention is (big as model volume in the conventional unsteady cavity plurality of advantages of reservation, transverse mode resolution is high) prerequisite under, utilize chamber external reflection formula optical element can realize the core of unstable cavity laser output annular beam is reconstructed, obtain the high energy circular solids laser beam output of high light beam quality; And the apparatus structure that is provided is simple, and working stability has especially overcome prior art and need obtain the deficiency of solid laser beam output by the structure of transforming conventional unsteady cavity.
Description of drawings
Fig. 1 is the structural representation that the unstable cavity laser of first embodiment of the invention is exported the core reconfiguration device of annular beam;
Fig. 2 is the ring-shaped light spot synoptic diagram of unstable cavity laser output;
Fig. 3 passes through the circular solids hot spot synoptic diagram after the conversion of light beam reconfiguration device among Fig. 1 for the annular beam of unstable cavity laser output;
Fig. 4 has annular cooling water groove, annular water tank structure of cover plate sketch for round table surface Perimeter Truss Reflector in the right angle among Fig. 1;
Fig. 5 is the left view of annular cooling water groove among Fig. 4;
Fig. 6 is the left view of annular water tank cover plate among Fig. 4;
Fig. 7 has annular cooling water groove, circular channels structure of cover plate sketch for right angle outer conical surface catoptron among Fig. 1;
Fig. 8 is the left view of annular cooling water groove among Fig. 7;
Fig. 9 is the left view of circular channels cover plate among Fig. 7;
Figure 10 is the structural representation that the unstable cavity laser of another embodiment of the present invention is exported the core reconfiguration device of annular beam;
Figure 11 is the structural representation that the unstable cavity laser of further embodiment of this invention is exported the core reconfiguration device of annular beam;
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the core reconfiguration device based on the unstable cavity laser of chamber outer light beam shaping technique output annular beam that provides of present embodiment mainly is made up of round table surface Perimeter Truss Reflector accurate displacement mechanism 6 in round table surface Perimeter Truss Reflector 301, right angle outer conical surface catoptron 501, the right angle in unstable cavity laser 1, the right angle and right angle outer conical surface catoptron accurate displacement mechanism 7.
Round table surface Perimeter Truss Reflector 301 is rotation symmetric form structural metal catoptron with right angle outer conical surface catoptron 501 in the described right angle, makes simply, can directly adopt ultra-precise cutting to process.
During installation, the rotation axes of symmetry of round table surface Perimeter Truss Reflector 301 and right angle outer conical surface catoptron 501 is all coaxial with the optical axis 4 of described unstable cavity laser 1 in the described right angle.
Round table surface Perimeter Truss Reflector 301 is staggered relatively along optical axis 4 directions with right angle outer conical surface catoptron 501 in the described right angle; Round table surface Perimeter Truss Reflector 301 can be regulated by round table surface Perimeter Truss Reflector accurate displacement mechanism 6 in the described right angle and right angle outer conical surface catoptron accurate displacement mechanism 7 respectively along the relative position of optical axis 4 directions with right angle outer conical surface catoptron 501 in the described right angle.
By Fig. 4～shown in Figure 6, the rear portion of round table surface Perimeter Truss Reflector 301 has annular cooling water groove 9 in the described right angle, have water inlet 11 and water delivering orifice 12 on annular water tank cover plate 10, the bottom of round table surface Perimeter Truss Reflector 301 can adopt welding manner to be tightly connected in annular water tank cover plate 10 and the described right angle.
By Fig. 7～shown in Figure 9, the rear portion of described right angle outer conical surface mirror 501 has annular cooling water groove 13, have water inlet 15 and water delivering orifice 16 on circular channels cover plate 14 equally, circular channels cover plate 14 can adopt welding manner to be tightly connected with the bottom of described right angle outer conical surface mirror 501.
The annular hollow beam 2 of unstable cavity laser 1 output along the optical axis 4 directions transmission perpendicular to described unstable cavity laser 1, and is concentrated to optical axis 4 positions after round table surface Perimeter Truss Reflector 301 turns in the right angle gradually; Utilize 501 pairs of right angle outer conical surface catoptrons to concentrate near optical axis 4 light beams and lead again, to obtain shaping light beam output along the transmission of optical axis 4 directions; Respectively round table surface Perimeter Truss Reflector in the described right angle 301 and right angle outer conical surface catoptron 501 are carried out minute adjustment along the relative position of optical axis 4 directions by round table surface Perimeter Truss Reflector accurate displacement mechanism 6 in the right angle and right angle outer conical surface catoptron accurate displacement mechanism 7, realize circular solids shaping light beam 8 outputs along the transmission of optical axis 4 directions.
Shown in Figure 10,11, in the right angle in the foregoing description round table surface Perimeter Truss Reflector 301 replaceable be round table surface Perimeter Truss Reflector 303 in round table surface Perimeter Truss Reflector 302 or the obtuse angle in the acute angle; Correspondingly, the right angle outer conical surface catoptron in the foregoing description 501 is also replaceable is acute angle outer conical surface catoptron 502 or obtuse angle outer conical surface catoptron 503.Wherein, round table surface Perimeter Truss Reflector 302 equates with the shaft section drift angle of described acute angle outer conical surface catoptron 502 in the described acute angle; Similarly, round table surface Perimeter Truss Reflector 303 equates with the shaft section drift angle of described obtuse angle outer conical surface catoptron 503 in the described obtuse angle.
Claims (10)
1. the central part reconstruction method of a unstable cavity laser output annular beam comprises the steps:
A. the round table surface Perimeter Truss Reflector leads to the annular hollow beam of unstable cavity laser output in utilizing, and makes it to concentrate to the optical axis position of laser instrument;
B. utilize the outer conical surface catoptron that near the above-mentioned light beam that concentrates on the laser optical axis is led again, obtain shaping light beam output along the optical axis direction transmission;
C. by regulating interior round table surface Perimeter Truss Reflector and outer conical surface catoptron relative position along optical axis direction, above-mentioned shaping light beam output along the optical axis direction transmission is regulated, until the circular solids shaping light beam output that realizes along the optical axis direction transmission, promptly finish the reconstruct of the core of described annular beam.
2. the central part reconstruction method of a kind of unstable cavity laser output annular beam according to claim 1, it is characterized in that, described in round table surface Perimeter Truss Reflector and outer conical surface catoptron rotation axes of symmetry all with the light shaft coaxle of described unstable cavity laser.
3. the reconstructing method of the core of a kind of unstable cavity laser output annular beam according to claim 1 and 2 is characterized in that, described interior round table surface Perimeter Truss Reflector has identical shaft section drift angle with described outer conical surface catoptron.
4. the central part reconstruction method of a kind of unstable cavity laser output annular beam according to claim 3 is characterized in that described shaft section drift angle can be acute angle, right angle or obtuse angle.
5. export the central part reconstruction method of annular beam according to the described a kind of unstable cavity laser of one of claim 1-4, it is characterized in that, round table surface Perimeter Truss Reflector and outer conical surface catoptron all have accurate displacement mechanism in described, and the adjusting of the relative position described in the step C realizes by regulating above-mentioned accurate displacement mechanism.
6. a device of realizing one of claim 1-5 described method comprises unstable cavity laser, interior round table surface Perimeter Truss Reflector, outer conical surface catoptron, interior round table surface Perimeter Truss Reflector accurate displacement mechanism and outer conical surface catoptron accurate displacement mechanism.
7. device according to claim 6 is characterized in that, described interior round table surface Perimeter Truss Reflector has identical shaft section drift angle with described outer conical surface catoptron.
8. device according to claim 7 is characterized in that, described shaft section drift angle can be acute angle, right angle or obtuse angle.
9. according to the described device of one of claim 6-8, it is characterized in that, the rear portion of round table surface Perimeter Truss Reflector has the first annular cooling water groove in described, has the annular water tank cover plate of water inlet and water delivering orifice and the bottom of described interior round table surface Perimeter Truss Reflector and adopts welding manner to be tightly connected.
10. according to the described device of one of claim 6-9, it is characterized in that, the rear portion of described outer conical surface catoptron has the second annular cooling water groove, has the circular channels cover plate of water inlet and water delivering orifice and the bottom of described outer conical surface catoptron and adopts welding manner to be tightly connected.
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| CN201010111202A CN101806958A (en) | 2010-02-05 | 2010-02-05 | Central part reconstruction method and device of unstable resonator laser annular beam |
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| CN201010111202A CN101806958A (en) | 2010-02-05 | 2010-02-05 | Central part reconstruction method and device of unstable resonator laser annular beam |
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| CN102518959A (en) * | 2011-11-18 | 2012-06-27 | 厦门大学 | Optically annular lighting device |
| CN102684052A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Laser unstable resonator capable of outputting solid light beam and application of laser unstable resonator |
| CN103309044A (en) * | 2013-06-28 | 2013-09-18 | 哈尔滨工业大学 | Method for shaping circular beams into ring beams |
| CN103746286A (en) * | 2014-01-07 | 2014-04-23 | 高秀敏 | Adjustable and controllable dye laser based on light fluid |
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| CN114355599A (en) * | 2021-12-16 | 2022-04-15 | 龙镎 | Gathering device for multi-path parallel light beams arranged in annular mode |
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| CN114951971A (en) * | 2022-04-26 | 2022-08-30 | 中国科学院西安光学精密机械研究所 | Light path system for femtosecond laser anti-reflection micro-nano structure machining head and debugging method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102518959A (en) * | 2011-11-18 | 2012-06-27 | 厦门大学 | Optically annular lighting device |
| CN102684052A (en) * | 2012-05-04 | 2012-09-19 | 华中科技大学 | Laser unstable resonator capable of outputting solid light beam and application of laser unstable resonator |
| CN102684052B (en) * | 2012-05-04 | 2013-07-10 | 华中科技大学 | Laser unstable resonator capable of outputting solid light beam and application of laser unstable resonator |
| CN103309044A (en) * | 2013-06-28 | 2013-09-18 | 哈尔滨工业大学 | Method for shaping circular beams into ring beams |
| CN103309044B (en) * | 2013-06-28 | 2015-02-04 | 哈尔滨工业大学 | Method for shaping circular beams into ring beams |
| CN103746286A (en) * | 2014-01-07 | 2014-04-23 | 高秀敏 | Adjustable and controllable dye laser based on light fluid |
| WO2016026377A1 (en) * | 2014-08-21 | 2016-02-25 | 方强 | Optical component with cooling function |
| CN104990512B (en) * | 2015-07-20 | 2017-08-11 | 清华大学 | Transparent vessel whorl of bottleneck defect detecting system and method |
| CN104990512A (en) * | 2015-07-20 | 2015-10-21 | 清华大学 | Transparent container bottle opening thread defect detection system and method |
| CN105958311A (en) * | 2016-06-24 | 2016-09-21 | 长春理工大学 | Dual-rectangular hollow laser based on spherical aberration regulation-control thermal-stability region and laser shaping and amplification |
| CN105958311B (en) * | 2016-06-24 | 2019-01-04 | 长春理工大学 | Spherical aberration regulates and controls the area Re Wen and the laser sizing amplification hollow laser of double square |
| CN111552087A (en) * | 2020-04-24 | 2020-08-18 | 哈尔滨工业大学 | Method for coupling annular light beam with coaxial reflective optical system |
| CN114355599A (en) * | 2021-12-16 | 2022-04-15 | 龙镎 | Gathering device for multi-path parallel light beams arranged in annular mode |
| CN114460740A (en) * | 2022-01-21 | 2022-05-10 | 华中科技大学 | Single-mirror annular light spot optical system |
| CN114951971A (en) * | 2022-04-26 | 2022-08-30 | 中国科学院西安光学精密机械研究所 | Light path system for femtosecond laser anti-reflection micro-nano structure machining head and debugging method |
| CN114951971B (en) * | 2022-04-26 | 2023-09-01 | 中国科学院西安光学精密机械研究所 | Optical path system and debugging method for processing head for femtosecond laser processing anti-reflection micro-nano structure |
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Open date: 20100818 |