Apparatus and method of melted quartz bar-quartz fiber composite phase conjugation

Abstract

The invention belongs to the laser nonlinear optical technology field. The invention includes the following steps: using the combination of melting quartz rod and quartz fiber, by the lens coupling method. Firstly, coupling laser to the quartz rod, then use the lens to couple into the quartz fiber. Use SBS effect of fiber, after obtaining, scattering the phase conjugation light to SBS, and return to the quartz rod. Since the quartz fiber has lower SBS threshold, and melting quartz rod can make laser beam having a larger focal spot diameter after the convergent, in order to have a higher damage threshold. Combine the two kinds of quartz devices, and after laser enters melting quartz rod without reaching SBS threshold, continuing to spread forward. Passing convergence lens, gather in the quartz fiber. When the light intensity reaches quartz fiber SBS threshold, it is produced to scatter to SBS. The backward scattering light reversely enters into melting quartz rod, with the follow-up incident laser, jointly producing the low threshold backward forcing SBS effect, making the combining fiber to reflect the light strong enough and phase conjugation with the incident light. Therefore, it achieves the purposes to compensate the phase distortion in the optical path and to improve the light beam quality.

Description

technical field

[0001] The invention relates to a fused silica rod-silica fiber composite phase conjugation device and method. Background technique

[0002] The high-power solid-state laser pumped by laser diode (LD) has the advantage of high repetition rate and full solidification. It has developed rapidly in recent years and has replaced the traditional xenon lamp-pumped solid-state laser system and has become a new generation of solid-state laser system. Its repetition frequency has been increased from the traditional tens of hertz to hundreds of hertz or even kilohertz. It is accompanied by serious laser medium thermal lensing effect at such a high repetition rate. Stimulated Brillouin backscattering (SBS) is a method to generate beam phase conjugation and effectively compensate thermal lens effect. When a beam with phase distortion is backscattered by SBS, the phase of the reflected light wave has the phase of the incident light Conjugate properties. The phase-conjug...

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