A High Power Active Mirror with Zero Thermal Lensing
A lens effect, high-power technology, applied in the structure/shape of the active medium, lasers, phonon exciters, etc., can solve the problems of uneven pumping, uneven cooling of the gain medium, and inability to effectively extract energy, etc. Good beam quality and reduced thermal lensing effect
Inactive Publication Date: 2017-10-10
SHANGHAI JIAOTONG UNIV
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Problems solved by technology
Because the size of the gain medium placed in parallel in each module in this patent is different, it is easy to produce uneven pumping, so that energy cannot be extracted effectively
Moreover, the influence of external force is not considered when placing the gain medium. The pressure generated by the contact between the edge of the gain medium and the rectangular frame and the gravity of the gain medium will cause the distortion of the laser wavefront
In addition, the cooling path is too long so that the cooling of the gain medium is not uniform, resulting in a transverse temperature gradient and a longitudinal temperature difference between the front and back of the gain medium
Method used
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[0024] A high-power active mirror with zero thermal lensing, whose structure is as figure 1 As shown, it includes a pump source 1, a circular sheet (about 0.5 mm in thickness) laser gain medium 2, a turntable 3 for placing the laser gain medium 2, soft porous glass or ceramic 4, a silicon carbide disc 6, a rotating shaft 9, etc. . The pulsed signal light coming out of the signal source 8 is transmitted in the X-Z plane at a certain incident angle, and is reflected and amplified by the laser gain medium 2 multiple times to finally realize high-power laser output.
[0025] The pump source 1 is a uniformly pumped continuous laser diode, which prevents the thermal lens effect of the laser gain medium due to the lateral temperature gradient. The pump source is cooled on a water-cooled plate, and the temperature is controlled at 20°C. Side pumping is used, and the light from the diode pumps the laser gain medium 2 vertically. The selected wavelength depends on the selected laser g...
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The invention relates to a high-power active reflector with zero thermal lens effect, comprising: multiple sets of rotating discs (3) uniformly provided with openings, rotating around a central rotating shaft (9), arranged in the openings, and placing laser gain media (2) porous glass or ceramics (4), a pump source (1) connected to the laser gain medium (2), and a silicon carbide disc (6) packaged on the outer surface of the turntable (3). Compared with the prior art, the present invention greatly reduces the thermal lens effect when high-power lasers are working, and can obtain high-power lasers with better beam quality. The active mirror is usually used to amplify pulsed light of different frequencies, so it can obtain High energy pulse.
Description
technical field [0001] The invention relates to the field of solid lasers, in particular to a high-power active reflector with zero thermal lens effect. Background technique [0002] In recent years, solid-state lasers have achieved rapid development. The output power, optical conversion efficiency and beam quality are greatly improved. However, thermal effects hinder the development of high-power lasers to a certain extent. Solid-state lasers can achieve very high output power, but the beam quality is not good. The beam quality of fiber lasers is very good, but the output energy of a single fiber is only on the order of millijoules. Depending on the shape of the laser gain medium, it can be roughly divided into rod (or fiber) lasers, sheet lasers and slab lasers. Although the shape is different, the basic principle is the same. When the laser gain medium is pumped, heat is generated in the medium due to quantum defects in the gain medium. The heat is transferred from ...
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IPC IPC(8): H01S3/0941H01S3/042H01S3/07
Inventor 徐剑秋周延张帅一
Owner SHANGHAI JIAOTONG UNIV