Laser linewidth measuring device

Abstract

The invention discloses a laser linewidth measuring device comprising a plurality of optical fiber couplers. The optical fiber couplers are connected with a multichannel optical switch through an optical fiber, a laser beam passing through the optical switch irradiates vertically on ground glass, the laser beam passing through the ground glass enters an F-P etalon, the laser beam passing through the F-P etalon irradiates directly on a CCD after passing through a lens and a vertical slit successively, the CCD transforms an optical signal into an electric signal and communicates the electric signal with a PC machine. The measuring device of the invention has compact structure and convenient operation, realizes the online, instant, precise and automatic measurement of laser linewidth parameters, is capable of measuring a linewidth of continuous laser and a linewidth of pulse laser, and measureing linewidths of multi-path different lasers quickly.

Description

technical field [0001] The invention belongs to a light width measuring instrument, in particular to a laser line width measuring device which uses an F-P etalon to measure the width of laser light. Background technique [0002] In the application field of laser technology, the line width of laser represents the monochromaticity of laser, which is one of the important parameters of laser. Especially in the application field of laser technology that requires good monochromaticity and precise controllable laser wavelength, such as dye lasers, solid-state tunable lasers, optical parametric oscillators, etc., it is essential to accurately measure the linewidth of the laser. The commonly used method of measuring laser line width is to use scanning interferometer, but this method has great limitations for pulsed laser measurement, especially for pulsed lasers with high repetition rate and narrow pulse width (less than 100ns). Due to the pulse jitter phenomenon and the existence o...

AI Technical Summary

Problems solved by technology

Although this measurement method has the advantage of intuitive images, it has certain requirements for the light to be measured and the measurement environment, and takes up a relatively large space. Moreover, the experimental data needs to be processed and calculated, and the line width value cannot be accurately obtained in real time.

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