Tunable laser automatic mode hopping restraining method

A technology for tuning lasers and lasers, applied in the field of precision laser interferometry, can solve the problems of high price, difficult adjustment, geometric error, etc., and achieve the effect of reducing maintenance, increasing working range and reliability

Active Publication Date: 2013-09-25
XI AN JIAOTONG UNIV
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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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  • Tunable laser automatic mode hopping restraining method
  • Tunable laser automatic mode hopping restraining method
  • Tunable laser automatic mode hopping restraining method

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the drawings.

[0035] See figure 1 The present invention adopts a sampling data control system composed of scanning interferometer, data acquisition equipment, laser control equipment, and computer. The collected scanning interferometer data is analyzed through software, and the laser output beam pattern is judged, and the computer controls the laser The controller adjusts the tuning parameters of the laser until the mode hopping is suppressed.

[0036] In the present invention, an external cavity tunable diode laser with a center wavelength of 780nm is used. The laser includes an internal cavity with gain and an external resonant cavity. The external resonant cavity is composed of a grating and a mirror. The laser integrates temperature control elements. The laser wavelength tuning range is 760nm~785nm. The temperature controller 18 and the current controller 19 control the gain chip of t...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/065
Inventor 刘志刚龚海陶龙邓忠文吕涛周扬理
Owner XI AN JIAOTONG UNIV
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