Continuous mode-hop-free tunable grating external-cavity diode laser

Abstract

The embodiment of the invention discloses a continuous mode-hop-free tunable grating external-cavity diode laser, which comprises at least one optical module consisting of a gain medium and a collimating lens, a tuning device and at least one diffraction grating; coherent beams emitted by the gain medium become parallel light after passing through the collimating lens; after the parallel light isdiffracted by the diffraction grating, one part of diffraction light directly becomes first output laser which is output, and the other part of diffraction light returns to the gain medium along the prior incident light path, is oscillated and amplified to be greater than an oscillator threshold of the laser in the gain medium, and becomes second output laser; the diffraction grating is arranged on the tuning device; the tuning device drives the diffraction grating to rotate around a rotating shaft positioned on the back of the diffraction grating; and the rotating shaft is parallel to the diffraction surface of the diffraction grating and vertical to the optical axis of the laser. The laser can realize mode-hop-free continuous tuning of laser frequency, and reduces the production cost ofthe laser.

Description

technical field [0001] The invention relates to the technical field of semiconductor lasers, in particular to a continuous non-mode-hopping tunable grating external cavity semiconductor laser. Background technique [0002] The wavelength tuning technology of light source is an important part of laser technology, and grating-tuned external cavity lasers (GTECL, Grating-tuned external cavity lasers) have high spectral purity, wide wavelength coverage, compact structure, and high conversion efficiency. , single-mode output, low cost, good reliability and other outstanding advantages, so it has been widely used in many fields such as optical communication, optical switching, optical storage, fiber optic gyroscope, metrology and measurement, high-resolution spectral measurement and biomedicine. Great application prospects. [0003] In the prior art, there are generally two types of tunable grating external cavity semiconductor lasers. One is a Littrow tunable grating external c...

AI Technical Summary

Problems solved by technology

But even so, in the manufacturing process of the above-mentioned lasers, there are still many problems such as complex optical and mechanical alignment, additional material cost of optical devices, large cavity size and very slow tuning speed.

[0025] In summary, there are many problems mentioned above in the lasers used in the prior art, which greatly limit the application of tunable grating external cavity semiconductor lasers in various fields

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