An Anti-Laser Isolation Method Based on Angle Separation

Abstract

The invention relates to a reverse laser isolation method based on angle separation. The reverse laser isolation method comprises steps that the polarization state of the reverse laser with respect to incident light is changed by adopting a wave plate or an optical rotation device; by adopting a crystal birefringence characteristic and adopting cooperation with an own wedge angle design, the angle change of the laser returned along an original optical path is realized; a spatial filter and other devices having angle separation functions are used isolate the reverse laser, and therefore the isolation of the laser returned along the original optical path is realized.

Description

technical field [0001] The invention belongs to the field of interaction between high-power lasers and targets, and in particular relates to a method for isolating the anti-laser returning along the original optical path. Background technique [0002] In the experiment of the interaction between high-power laser and matter, the anti-laser generated by focusing the target position returns along the original optical path, which has the characteristics of natural self-collimation. According to the principle of reversibility of the optical path, the anti-laser will be transmitted to the front-end system. For the fundamental frequency targeting device, the fundamental frequency anti-laser will be further amplified in reverse in the amplifier, and its energy can easily exceed the threshold of the optical element, threatening the safety of the laser driver. This effect will greatly limit the fundamental frequency targeting output performance of the high-power laser. . Therefore, ...

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Problems solved by technology

The above methods have their own advantages and disadvantages. For example, in the large-aperture optical path, the processing difficulty of the large-aperture polarizer in the method of gating combined with partial selection is extremely difficult, and its isolation ability is limited, generally only 100 times; Combined, the thicker optics increase the B-integral of the laser system, creating a risk of damage to the optics

The light source generated by frequency doubling or other nonlinear processes will change the wavelength of the laser on the one hand, which will affect the effect of laser targeting. On the other hand, the efficiency of nonlinear processes is generally low and there will be greater loss

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