Independent double-cell phase conjugation device consisting of tapered fibers and fused silica rod and method

Abstract

The invention discloses an independent double-cell phase conjugation device consisting of tapered fibers and a fused silica rod and a method. Laser, of which the initial polarization state is p polarization passes through a first polaroid, a first lambda / 2 wave plate and a second polaroid, wherein a path of laser, of which the polarization state is s polarization is reflected by the second polaroid and a third polaroid, passes through a first lambda / 4 wave plate and a first coupling lens, enters the tapered fiber and generates a stimulated Brillouin scattering laser, while the laser of p polarization passes through the second polaroid to be continuously transmitted forward and enters the fused silica rod to serve as a pump source; the stimulated Brillouin scattering laser reflected by thetapered fiber enters the fused silica rod to serve as a seed source which interacts with a pump light before being amplified; and the amplified seed light is reflected and spatially superposed with the original incident laser. The device and the method have the advantages of greatly improving the quality of the output beam of the laser, reducing the spatial divergence angle of the emergent laser and compensating for the thermal distortion effect in the laser under operation of high power and high repetition rate.

Description

technical field [0001] The invention relates to an independent double pool type phase conjugation device and method composed of a tapered optical fiber and a fused silica rod. Background technique [0002] Since stimulated Brillouin scattering has been proven to correct laser wavefront distortion, it has been continuously used as a phase conjugate mirror to improve the quality of laser beams. Compared with the phase conjugate mirror using gas and liquid as the stimulated Brillouin scattering medium, the solid phase conjugate mirror has gradually shown its advantages in the actual laser system due to its non-toxic, harmless, high-voltage, stable, convenient, and reliable advantages. , especially the application prospect and value in the high-power all-solid-state main oscillation-power amplification laser system. Therefore, in order to meet the urgent need for the further practical application of SBS phase conjugation technology, it is necessary to search for high-gain, high...

AI Technical Summary

Problems solved by technology

Although there are also composite phase conjugation devices composed of fused silica rods and silica fibers used in high repetition rate and high power laser systems, such devices have low reflectivity and a small dynamic range, making them difficult to use in practical laser applications. system

The invention adopts an independent double-cell phase conjugation device and method composed of a tapered optical fiber and a fused silica rod, which overcomes the shortcomings of low reflectivity and small dynamic range of the composite phase conjugation device of the fused silica rod and quartz optical fiber, and simultaneously High laser damage threshold

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