Apparatus and method of melted quartz bar-quartz fiber composite phase conjugation
A silica fiber and phase conjugation technology, applied in optics, lasers, nonlinear optics, etc., can solve problems such as high laser damage threshold and low SBS threshold, reduce spatial divergence angle, compensate thermal lens effect, and improve output beam quality effect
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[0027] Fig. 2 shows a schematic diagram of a dual-pass laser oscillation-amplification system (MOPA) applied to LD pumping Nd:YAG. It works as follows:
[0028] The laser light emitted by the oscillation stage is amplified by the Faraday magnetic-optical isolator, amplification stages 1 and 2, and then coupled to the composite fused silica rod-silica fiber stimulated Brillouin scattering (SBS) phase conjugate device by the lens. After the forced SBS backscattered light excited by the fused silica rod enters the amplification stages 1 and 2, it is output from the polarizer P2 after the second pass of amplification. Thermal lensing and other phase distortions caused by the two amplification stages are eliminated after the second pass of the beam. Therefore, the output light is improved in beam quality.
[0029] In the above composite phase conjugation device and its application experiment in the high power and high repetition rate LD pumped solid-state laser oscillation amplif...
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