External cavity semiconductor laser

Abstract

The present invention discloses an external cavity semiconductor laser, comprising a semiconductor laser tube, a monoblock annular F-P cavity and a photorefractive crystal. The laying of each part in the semiconductor laser allows that: a light beam emitted from the semiconductor laser tube enters into the monoblock annular F-P cavity through an input surface of the monoblock annular F-P cavity, and is returned to the incidence point in the input surface after being reflected by at least two reflecting surfaces; and a transmitted light through one of the reflecting surfaces of the monoblock annular F-P cavity, which is made as an emergent light of the monoblock annular F-P cavity, enters into the photorefractive crystal, and is fed back to the semiconductor laser tube according to the original route. The present invention can realizes an output-stabilized narrow line width and a single-mode wide range of tune, simultaneously solves the problem that the stability of a discrete element F-P cavity is not good and vulnerable to outside interference, the volume of the F-P cavity is too large, and the system is complicated.

Description

technical field [0001] The invention relates to the technical field of semiconductor lasers, in particular to a novel single-mode wide-range tuned narrow-linewidth external-cavity semiconductor laser. Background technique [0002] At present, YabaiHeandBrianJ.Orr proposes an external cavity semiconductor laser using a discrete component folded F-P cavity structure, the structure of which can be found in figure 1 As shown, the three mirrors of the ring filter (Ringfilter) constitute an equivalent F-P cavity, and the laser beam emitted by the semiconductor laser tube (LD, Laserdiode) enters the After oscillating in the F-P cavity formed by the Ringfilter, the transmitted light passes through the partial mirror M2 and finally enters the photorefractive crystal (Photo-refractive crystal), and its phase conjugate light returns through the original path, and the refracted light feedback after passing through the F-P cavity Go to TA for model selection. [0003] However, the F-P ...

AI Technical Summary

Problems solved by technology

Generally speaking, the above-mentioned changes are not synchronous, which will cause the mode-hopping change of the laser mode, interrupting the tuning of the laser frequency, so that the available continuous non-mode-hopping tuning range of the laser frequency is very small, such as 1 to 2 GHz

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