Cavity adjusting method for laser gyro and used light path and path length control mirror

Abstract

This invention discloses a laser gyroscope chamber adjusting method and its light path distance control lens. The method is the following: to exert toothed wave voltage on four control units of the angle control elements; to whole scan loop light path in two-dimensional space, wherein, two control units in one group are of same frequency and reverse voltage; the maximum scanning voltage of the output light intensity is the chamber voltage of the best loop resonance light path. The light path distance control lens comprises slotted vane , angle control element , matching loop and distance control element.

Description

technical field [0001] The invention relates to high-precision cavity tuning of an active cavity laser gyro, in particular to high-precision cavity tuning of a highly integrated three-axis laser gyro sharing six mirrors. Background technique [0002] The cavity adjustment of the laser gyro is to adjust the reflection direction of several (three or more) mirrors forming a circular loop to make it a closed-loop resonant cavity with maximum gain and minimum loss. The traditional cavity adjustment method is to use reference light to assist cavity adjustment. It usually uses the different reflection directions of different points on the spherical mirror to control the optical path, so that the reference light forms resonance in the gyro cavity to achieve the purpose of cavity adjustment. However, the benchmark of this traditional cavity tuning method is to introduce reference light from the outside to tune the cavity. The state of the cavity body during cavity tuning is significa...

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Problems solved by technology

However, the benchmark of this traditional cavity tuning method is to introduce reference light from the outside to tune the cavity. The state of the cavity body during cavity tuning is significantly different from the actual working state of the laser gyro filled with working gas when the gain medium is in an excited state. , which inevitably has many disadvantages: 1. When adjusting the cavity, the reference light input to the gyro cavity may not be completely coaxial with the optical path hole of the cavity, resulting in deviation

2. The cavity adjustment process is carried out in the atmospheric environment, and when the active cavity laser gyro is in the actual working state, the cavity is at low pressure, so the pressure difference between the inside and outside of the lens in the actual working state is different from the inside and outside pressure difference when the cavity is adjusted Larger (the difference between the two is about 1atm), which will cause the slight deformation of the reflective mirror (mainly the cavity length control mirror with a thin bottom structure), so that the reflection points on the mirror in the loop and the reflection points when adjusting the cavity inconsistent

3. The cavity adjustment process is carried out for a passive cavity that is not filled with working gas, and it is impossible to involve the gain characteristics of the gain section in the actual working state, so there are actual differences between the closed-loop resonators of the two

The three gyroscopes are intertwined with each other, it is difficult to achieve the best reflector position through limited manual adjustment, and the optical paths of the three laser gyroscopes cannot be in a relatively ideal closed loop at the same time

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