Laser amplifier phase noise measurement system

Abstract

A laser amplifier phase noise measurement system which comprises a master oscillator, an optical beam splitter, a phase modulator, a phase modulation signal generator, an optical path adjustment device, an optical path adjustment device controller, a laser amplifier to be measured, laser alignment systems, a high reflectivity mirror, a power receiver, a total reflective mirror, polarization rotators, a polarization beam combiner, polarizers, photoelectric detectors, phase demodulation systems, 3dB electricity beam splitters, pi / 2 phase shifters and a data acquisition module. The phase modulator is connected with the phase modulation signal generator which is used for applying modulating signals with needed frequencies on the phase modulator, and the optical path adjustment device is connected with the optical path adjustment device controller which accurately controls the optical path adjustment device. According to the laser amplifier phase noise measurement system, the influence of factors such as the polarization state and the amplitude ratio of a light beam on the phase noise measurement system can be avoided, and the accurate measurement of laser phase noise can be achieved.

Description

technical field [0001] The invention belongs to the field of laser technology, and relates to a laser amplifier phase noise measurement system based on polarization beam combining and digital phase shifting technology. Background technique [0002] Due to environmental disturbances, mechanical vibrations, thermal effects, pump power fluctuations and other factors, laser amplifiers will inevitably produce certain phase noise distribution characteristics. In the fields of high-precision sensing, gravitational wave detection, and laser coherent synthesis, the distribution characteristics of the phase noise of the amplifier directly determine the overall performance of the system. Specifically, in high-precision sensing and gravitational wave detection systems, the amplitude and noise spectral density of phase noise determine the authenticity and accuracy of the entire demodulated signal; in coherent synthesis systems, the amplitude and noise spectral density of phase noise Det...

AI Technical Summary

Problems solved by technology

[0003] At present, the measurement methods for phase noise are mainly based on the Mach–Zehnder interferometer structure or the double-beam interference structure arranged in an array. The entire measurement system is easily affected by factors such as laser polarization state and amplitude ratio.

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