FDB laser array based on injection locking

Abstract

The present invention relates to the technical field of optoelectronics and more particularly to an FDB laser array based on injection locking. The FDB laser array comprises a master laser, n slave lasers, n beam splitting devices, n circulators, a wave plate, and n+1 phase modulators. The master laser is connected to the ports 1 of the corresponding circulators through the beam splitting devices.The tail end of the master laser is connected to the corresponding phase modulator through the wave plate and the modulated laser is outputted from the output end of the corresponding phase modulator. The output end of each slave laser is connected to the port 2 of the corresponding circulator. The port 3 of each circulator is connected to the corresponding phase modulator, and the modulated laser is outputted from the output end of the corresponding phase modulator. The FDB laser array based on injection locking provided by the present invention finally forms a laser array output with excellent spectral characteristic, the same phase and the same polarization direction, greatly improves the output characteristics, and satisfies the requirements of practical use.

Description

【Technical field】 [0001] The invention relates to the field of optoelectronic technology, in particular to an injection-locked DFB laser array. 【Background technique】 [0002] At present, due to the advantages of semiconductor lasers such as small size, simple structure, low input energy, long life, easy modulation and low price, semiconductor laser arrays have been widely used in the field of optoelectronic technology, especially distributed feedback lasers (Distributed Feedback Lasers) , abbreviated as DFB) array application. However, with the development of practical applications, the requirements for the output characteristics of the semiconductor laser array are gradually increasing, especially the requirements for the power, coherence and polarization state of the output laser array are getting higher and higher. Generally, the closer the power of the laser units output by the laser array, the smaller the phase difference, the more consistent the polarization, the bet...

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Problems solved by technology

Generally, the closer the power of the laser units output by the laser array, the smaller the phase difference, the more consistent the polarization, the better the output characteristics, the more conducive to the application; while in the traditional semiconductor laser array, the spectral consistency of each laser output is poor, coherent low degree and large phase difference, it is difficult to meet the needs of actual use

For example, when used as an array light source, the traditional laser array has a large degree of scattering and poor laser coherence. When used in an environment with a lot of suspended particles such as underwater or foggy days, the interference is large. Scanning or imaging has a greater impact

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