CN217469093U - Low-loss high-power all-solid-state laser - Google Patents
Low-loss high-power all-solid-state laser Download PDFInfo
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- CN217469093U CN217469093U CN202221396324.8U CN202221396324U CN217469093U CN 217469093 U CN217469093 U CN 217469093U CN 202221396324 U CN202221396324 U CN 202221396324U CN 217469093 U CN217469093 U CN 217469093U
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Abstract
The utility model relates to the technical field of laser, in particular to a low-loss high-power all-solid-state laser which passes through Nd, YAG, Nd, YVO 4 YAG passive Q-switched design of the coaxial double crystal improves the polarization ratio and the polarization stability of the output laser; by finely adjusting the installation angles of the laser gain medium and the Q-switched crystal, the probability that reflected light on the surface of the Q-switched crystal is converged near the main oscillation laser optical axis is reduced, and the fact that stray light does not exist near a laser spot at a far-field position is ensured(ii) a By providing a beam expanding system, the divergence angle of the laser beam is reduced. The utility model discloses an utilize the side pump mode to obtain the laser output of high beam quality.
Description
Technical Field
The utility model relates to the field of laser technology, specifically a low-loss high-power all-solid-state laser.
Background
The all-solid-state laser (DPL) is a solid laser using a semiconductor Laser (LD) as a pump source, integrates the advantages of the conventional solid laser and semiconductor laser, has the advantages of small volume, light weight, high efficiency, stable performance, good reliability, long service life, easy operation, flexible and convenient operation, easy intellectualization, no pollution and the like, and becomes one of the most potential new generation laser sources at present. The DPL of high power adopts the side pumping mode more, but has the laser beam more scattered, and the loss is great, and the relatively poor problem of beam quality awaits for a moment to solve.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-power all solid-state laser of low-loss to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
a low-loss high-power all-solid-state laser comprises a resonant cavity, wherein a laser output mirror and a reflector of the resonant cavity are coaxially arranged, and a laser gain medium of the resonant cavity comprises Nd: YAG crystal and Nd: YVO 4 Crystal, Nd: YAG crystal and Nd: YVO 4 The crystal is coaxially arranged, and the Q-switched crystal of the resonant cavity is made of Cr, namely YAG crystal material;
the included angle between the optical axis of the laser gain medium and the Q-switched crystal and the optical axis of the laser output mirror is 0-2 degrees;
and a beam expanding system is coaxially arranged between the laser output mirror and the reflecting mirror and the laser output mirror, and comprises a concave lens and a convex lens.
As a further aspect of the present invention: the light-transmitting surfaces of the laser gain medium and the Q-switched crystal are plated with antireflection films.
As a further aspect of the present invention: the laser gain medium adopts a crucible one-step forming process, and quartz is used as a heat insulation material.
As a further aspect of the present invention: the resonant cavity comprises a pumping source and adopts a side pumping mode.
Compared with the prior art, the beneficial effects of the utility model are that: passing through Nd: YAG/Nd: YVO 4 The Cr: YAG passive Q-switched design of the coaxial double crystal improves the polarization ratio and the polarization stability of output laser on the basis of retaining the advantages of compact structure and small volume of an Nd: YAG/Cr: YAG laser; the divergence angle of the laser beam is reduced by the beam expanding system; by finely adjusting the installation angles of the laser gain medium and the Q-switched crystal, the probability that reflected light on the surface of the Q-switched crystal is converged near the main oscillation laser optical axis is reduced, and the fact that stray light does not exist near a laser spot at a far-field position is ensured. By the means, the laser loss is reduced, and the beam quality is improved.
Drawings
Fig. 1 is a schematic diagram of the resonant cavity structure of the present invention.
Wherein: 1 laser output mirror, 2Nd YAG crystal, 3Nd YVO 4 The device comprises a crystal, a 4 concave lens, a 5 convex lens, a 6 pumping source, a 7Q-switched crystal and an 8 reflector.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Referring to fig. 1, the present invention provides a low-loss high-power all-solid-state laser, which comprises a resonant cavity, and a laser output mirror 1 and a reflector 8 of the resonant cavity are coaxially disposed.
The laser gain medium of the resonant cavity comprises Nd: YAG crystal 2 and Nd: YVO4 crystal 3, the Nd: YAG crystal 2 and the Nd: YVO4 crystal 3 are coaxially arranged, and the Q-switched crystal 7 of the resonant cavity is made of Cr: YAG crystal material. The Nd: YAG/Cr: YAG laser has the advantage of high power, but because Nd: YAG is an isotropic crystal material, the output laser does not have polarization. The Nd: YVO4 crystal 3 has birefringence, so that the Nd: YVO can be used 4 The laser output by the/Cr YAG laser has good polarization, but the Nd YVO4 crystal 3 has larger excited section and shorter upper energy level life, thereby leading the Nd YVO 4 High repetition frequency of YAG laser outputAnd thus the output power is low. Thus passing through Nd: YAG/Nd: YVO 4 The Cr: YAG passive Q-switched design of the coaxial double crystal overcomes the defects of two crystal materials and combines the advantages. Because of Nd: YVO 4 The crystal has polarized emission characteristic, so that the whole laser is Nd: YVO 4 The polarization direction of the crystal has certain polarization advantages, so that the polarization mode is superior in mode competition, and modes in other polarization states are competed, thereby ensuring high power and improving the polarization ratio and polarization stability of output laser.
The included angle between the optical axes of the laser gain medium and the Q-switched crystal 7 and the optical axis of the laser output mirror 1 is between 0 and 2 degrees. By finely adjusting the installation angle of the laser gain medium and the Q-switched crystal 7, the probability that the reflected light on the surface of the Q-switched crystal converges near the main oscillation laser optical axis is reduced, and the fact that stray light does not exist near a laser spot at a far-field position is ensured.
A beam expanding system is coaxially arranged between the laser output mirror 1 and the reflecting mirror 8 and the laser output mirror 1, and the beam expanding system comprises a concave lens 4 and a convex lens 5. Since the beam width product of the laser beam is approximately a certain value, the divergence angle of the laser beam is reduced by expanding the diameter of the laser beam.
The light-transmitting surfaces of the laser gain medium and the Q-switching crystal 7 are plated with antireflection films, so that the internal loss of a resonant cavity of the laser can be reduced. The laser gain medium adopts a crucible one-step forming process, and quartz is used as a heat insulation material. The resonant cavity comprises a pumping source 6, and a side pumping mode is adopted to ensure high-power output of the laser.
Although the preferred embodiments of the present patent have been described in detail, the present patent is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present patent within the knowledge of those skilled in the art.
Claims (4)
1. The utility model provides a low-loss high-power all-solid-state laser, includes the resonant cavity, and the laser output mirror and the speculum of resonant cavity are coaxial to be placed its characterized in that:
the laser gain medium of the resonant cavity comprises Nd: YAG crystal and Nd: YVO 4 Crystal, Nd: YAG crystal and Nd: YVO 4 The crystal is coaxially arranged, and the Q-switched crystal of the resonant cavity is made of Cr, namely YAG crystal material;
the included angle between the optical axis of the laser gain medium and the Q-switched crystal and the optical axis of the laser output mirror is 0-2 degrees;
and a beam expanding system is coaxially arranged between the laser output mirror and the reflecting mirror and the laser output mirror, and comprises a concave lens and a convex lens.
2. A low-loss high-power all-solid-state laser according to claim 1, wherein: and the light-transmitting surfaces of the laser gain medium and the Q-switching crystal are plated with antireflection films.
3. A low-loss high-power all-solid-state laser according to claim 2, wherein: the laser gain medium adopts a crucible one-step forming process, and quartz is used as a heat insulation material.
4. A low-loss high-power all-solid-state laser according to claim 3, wherein: the resonant cavity comprises a pumping source and adopts a side pumping mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221396324.8U CN217469093U (en) | 2022-06-07 | 2022-06-07 | Low-loss high-power all-solid-state laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221396324.8U CN217469093U (en) | 2022-06-07 | 2022-06-07 | Low-loss high-power all-solid-state laser |
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| Publication Number | Publication Date |
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| CN217469093U true CN217469093U (en) | 2022-09-20 |
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| CN202221396324.8U Active CN217469093U (en) | 2022-06-07 | 2022-06-07 | Low-loss high-power all-solid-state laser |
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| CN (1) | CN217469093U (en) |
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- 2022-06-07 CN CN202221396324.8U patent/CN217469093U/en active Active
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