Device for measuring linewidth of narrow linewidth laser based on optical fiber time-delay self heterodyne method as well as method for measuring thereof
An optical fiber delay line and optical fiber delay technology, which are used in measurement devices, optical devices, instruments, etc., can solve the problems of high cost, bulky, inconvenient use, etc., and achieve the effect of high-precision testing and reducing volume
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[0059] Assuming that the linewidth of the measured laser is 10kHz, the coherence time τ c =100μs; using 2500m delay line, τ d =121.5μs, N=τ d / τ c = 0.823. Substituting the three parameters into the simulation program, the result is shown in Figure 4, which is actually the power curve when N=0.823, and the line width is 25.5kHz; " * "The line is the power spectrum curve obtained by using the uniformly widened line shape function, and the line width is 10.001kHz. The two results reflect that when the delay time of the optical fiber delay line is not large enough, the line width is 2.5 wider than the actual line width It can only roughly reflect the magnitude of the line width, and the accuracy error is too large.
[0060] According to the above method, the length of the fiber delay line is selected as 2500m, and the laser line width ranges from 2kHz to 60kHz, and 30 frequency points with a step of 2kHz are respectively selected, and the corresponding parameters are converte...
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