Time Stability Test Method of Photoelectric Receiver Based on Dual Acousto-optic Frequency Shifting

Abstract

The invention belongs to a laser application technology, and relates to a photoelectric receiver time stability test method based on double-acousto-optical frequency shift. The method includes using a single-frequency laser as a light source, outputting a double-frequency laser after the single-frequency laser passes a double-acousto-optical frequency shifter, utilizing a non-polarized beam splitting prism for beam splitting, and testing phase difference between a to-be-tested photoelectric receiver and a reference photoelectric receiver. The method has the advantages that in testing, linearly polarized light with the frequencies of v1 and v2 in a reference light beam is transmitted in a coaxial identical-optical-path mode, and linearly polarized light with the frequencies of v1 and v2 in a measurement light beam is transmitted in a coaxial identical-optical-path mode; phases of the two light beams are unaffected by external environmental changes, extra phase errors are not introduced, and test accuracy is high; test frequency can be changed by the aid of the double-acousto-optical frequency shifter, and time stability of photoelectric receivers is tested when different beat frequencies interfere the frequency.

Description

technical field [0001] The invention belongs to laser application technology, and mainly relates to a method for testing the time stability of a photoelectric receiver based on double acousto-optic frequency shifting. Background technique [0002] With its high sensitivity, high precision and non-contact characteristics, laser interferometry occupies an increasingly important position in the fields of precision and ultra-precision processing, microelectronics equipment, nanotechnology and other cutting-edge industrial equipment and national defense equipment, and has been widely used. [0003] In the laser heterodyne interferometry system, the photoelectric receiver plays an important role in realizing signal reception and signal conversion, and its performance, especially time stability, will directly affect the measurement stability and measurement accuracy of the entire measurement system. In order to study the time stability of the photoelectric receiver, Xi'an Universit...

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Problems solved by technology

However, this document only theoretically analyzes the noise characteristics and data of photodetectors, and does not actually analyze the errors introduced in the electrical signal processing circuit and their impact on stability

[0005] To sum up, the current noise analysis and stability analysis of the photoelectric receiver are only realized through theory and simulation, and the time stability of the photoelectric receiver is not actually tested, so that the stability of the photoelectric receiver Calibration only stays at the stage of theoretical analysis and is not accurate; moreover, the current analysis only analyzes the stability of the photodetector device in the photoelectric receiver, and does not analyze the time stability of the electrical signal processing circuit of the photoelectric receiver. In practice, the electrical signal processing circuit part will introduce phase drift into the output signal of the photoelectric receiver, which will affect the time stability of the photoelectric receiver, and the time stability of the optical beat frequency signal of different frequencies is also different. To a certain extent, it will affect the calibration of the working time stability of the heterodyne interferometry system

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