Continuous laser device spectral line width measurement device based on optical frequency comb

Abstract

The invention discloses a continuous laser device spectral line width measurement device based on an optical frequency comb. The continuous laser device spectral line width measurement device is characterized by comprising an optical frequency comb control module, an optical frequency comb seed source, an optical frequency comb spectrum broadening module, a continuous laser generating source, an optical beam combining module, an optical frequency selecting filtering module, a beat frequency detecting module and a signal reading module. The spectrum of the precisely-controlled optical frequency comb is broadened, output light of the precisely-controlled optical frequency comb and output light of the continuous laser generating source together enter the optical beam combining module, the light spots of two outgoing laser beams coincide, and then the two laser beams together enter the optical frequency selecting filtering module, two laser beams obtained through filtering pass through the beat frequency detecting module, the sizes of light spots are changed through shaping, and the light spots are concentrated on a detector, beat frequency signals are obtained through coherent combination, and the output spectral width of the continuous lasers to be measured can be contained through the signal reading module. The continuous laser device spectral line width measurement device is stable in structure and high in practicability, the measurement process is rapid and simple, and the output spectral width of one or more wave length continuous lasers can be obtained in real time.

Description

technical field [0001] The invention relates to the field of ultrafast lasers, specifically, a precisely controlled mode-locked laser is used to generate a stable optical frequency comb with a narrow pulse linewidth, and then the optical frequency comb is used to beat the output light of the narrow linewidth continuous laser to achieve A fast and effective measuring device for real-time measurement of the output spectral linewidth of continuous lasers with linewidths in the KHz to MHz order. Background technique [0002] Continuous laser and pulsed laser, as two branches in the field of laser technology, have been closely concerned by practitioners in various fields of scientific research, production and life. On the one hand, the ultra-narrow linewidth continuous laser based on the atomic transition line can provide frequency standard reference for many ultrafast laser technologies. At the same time, the emerging narrow linewidth continuous fiber laser has good noise suppre...

AI Technical Summary

Problems solved by technology

This not only brings inconvenience to the actual operation, but also enhances the stimulated Brillouin scattering (SBS, stimulated Brillouin scattering) effect during the laser transmission process, resulting in adverse effects such as reduced output power of the fiber laser and deterioration of beam quality; at the same time, the current There are methods that cannot realize the detection of short-term stability and long-term stability of continuous laser linewidth

Images