High accuracy measurement system of line width of narrow line width laser

Abstract

The invention relates to a high accuracy measurement system of the line width of a narrow line width laser. The high accuracy measurement system comprises a first optical coupler and a second optical coupler; an a port of the first optical coupler is connected with a laser light source to be measured; a b port of the first optical coupler is connected with a signal receiving unit through a photoelectric detector; a c port of the first optical coupler is connected with an f port of the second optical coupler through an isolator; a d port of the first optical coupler is connected with an e port of the second optical coupler; a g port of the second optical coupler is connected with the reflecting surface through an optical fiber delay line; a beat frequency signal is generated by the light which is fed back through the outer chamber of the reflecting surface to pass through the optical fiber delay line twice and the light of the f port of the second optical coupler through the g port of the second optical coupler; the beat frequency signal is output through the b port of the first optical coupler and converted into a current signal through the photoelectric detector; the current signal is received by the signal receiving unit and a corresponding lorentz linear light current spectrum line is obtained; the full width half maximum of the light current spectrum line is the line width of the laser light source to be measured. The high accuracy measurement system of the line width of the narrow line width laser has the advantages of being simple and compact in structure, easy to implement, low in cost and high in accuracy.

Description

technical field [0001] The invention relates to the measurement technology of laser line width, in particular to a high-precision measurement system of narrow line width laser line width. Background technique [0002] With the development of optical fiber communication networks, Dense Wavelength Division Multiplexing (DWDM) systems and coherent optical communication systems, single-frequency lasers have attracted attention because of their narrow linewidth, compatibility with communication systems, and their application prospects in further expansion of DWDM. At the same time, narrow-linewidth fiber lasers are widely used in the fields of optical fiber communication, optical fiber sensing, optical fiber remote sensing, mine detection and high-precision spectroscopy due to their narrow linewidth, low noise, anti-electromagnetic interference, safety and remote control. In addition, high-power narrow-linewidth single-frequency fiber lasers are also of great significance in the ...

AI Technical Summary

Problems solved by technology

The second-order Stokes light has an extremely narrow linewidth, so the measurement accuracy is high, but the biggest limitation of this method is that it cannot measure a wider laser linewidth, and to obtain the second-order Stokes light requires a large injection power. For low-power Lasers can't test

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