Narrow linewidth laser large-range frequency quick tuning device

Abstract

A narrow linewidth laser large-range frequency quick tuning device comprises a narrow linewidth optical fiber laser unit, a polarization maintaining optical fiber isolator, an optical fiber polarization beam splitter, a first polarization maintaining optical fiber circulator, an electrooptical modulator, a Faraday mirror, a second polarization maintaining optical fiber circulator, a first optical fiber polarization beam splitter, a first semiconductor laser unit, a tunable band-pass optical fiber filter, a second semiconductor laser unit, a second optical fiber polarization beam splitter, a low-noise digital signal generator, a voltage-controlled oscillator, a microwave amplifier, a first current drive controller, a first temperature controller, a second current drive controller and a second temperature controller. According to the device, the problem that the frequency modulation range of an existing high-order sideband injection locking technology is limited is solved, and by the combination of the characteristics that the linewidth of the optical fiber laser unit is narrow and the response speed of the electrooptical modulator is high, large-range frequency quick tuning of narrow linewidth lasers is achieved.

Description

technical field [0001] The invention relates to laser frequency tuning, in particular to a device for fast tuning of wide range frequency of narrow line width laser. Background technique [0002] In the fields of inter-satellite coherent laser communication and synthetic aperture radar, in addition to high coherence and narrow linewidth, lasers as light sources also need to have excellent frequency tuning performance, including frequency tuning range, tuning speed, and tuning linearity etc., and semiconductor lasers have been widely used in the above fields due to their small size, high efficiency, and convenient use. At present, the commonly used single-frequency tunable semiconductor laser technology mainly includes external cavity semiconductor laser (ECDL) and monolithic integrated single-frequency semiconductor laser. The external cavity semiconductor laser can realize a wide range of tuning, and its output laser has good line width characteristics. , but it often has ...

AI Technical Summary

Problems solved by technology

This device can solve the problems of limited output optical power and frequency modulation range in the commonly used fast external frequency tuning of lasers, and can use small-scale tuning RF drive signals and low-bandwidth electro-optic modulators to achieve wide-range narrow-linewidth laser frequency fast tuning

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