Tunable laser automatic mode hopping restraining method

Abstract

The invention discloses a tunable laser automatic mode hopping restraining method. Laser light emitted by a tunable laser controlled by a computer enters a scanning interferometer, the scanning interferometer is connected with a data acquisition card, the data acquisition card collects interference signals and scanning signals produced by the scanning interferometer to the computer, then an output mode of the laser is judged by means of an algorithm judged by the output judgment of the laser, after the output mode of the laser is judged to be a non single mode state, the method for restraining mode hopping by means of currents is utilized, and the tunable laser recovers to a single mode output state. According to the tunable laser automatic mode hopping restraining method, the output mode when the tunable laser operates can be detected in real time, mode hopping produced on a position needed by operation of the laser is automatically fed back and restrained, therefore the working range and reliability of the tunable laser are increased, the tunable laser can be applied to the field of precise laser interferometry, and meanwhile manual maintenance is reduced.

Description

Technical field [0001] The invention belongs to the field of precision laser interference measurement, and specifically relates to a method for suppressing automatic mode hopping of a tunable laser. Background technique [0002] In recent years, tunable lasers have developed rapidly and have been widely used in communications, spectral analysis, precision measurement and other fields. However, due to the limitations of the various parameters of the tunable laser components and the structural errors, it is easy to cause mode jumps in the laser, which leads to power instability and poor coherence in certain wavelength ranges. It is difficult for some external cavity tunable lasers to avoid mode hopping in the entire tuning range. This severely affects the performance of the tunable laser and limits its application in the band where mode hopping occurs. Therefore, suppressing the mode hopping phenomenon will greatly expand the application range of tunable lasers. [0003] The exist...

AI Technical Summary

Problems solved by technology

Moreover, the high-resolution spectrometer is expensive and the response speed is slow. If it is integrated in the automatic control system, it will affect the overall performance

In addition, using the mechanical structure to adjust the length of the external cavity can easily lead to geometric errors, causing resonant cavity detuning, and the adjustment is extremely difficult, which is one of the reasons why external cavity tunable lasers are expensive

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