Semiconductor laser of external cavity of tunable grating

Abstract

The invention discloses a semiconductor laser of an external cavity of a tunable grating. The semiconductor laser mainly comprises a semiconductor laser, a collimating lens, a diffraction grating and a tuning device. Laser emitted from the semiconductor laser is collimated through the collimating lens and then irradiates onto the diffraction grating; a primary diffraction light obtained by diffraction returns to an active region of the semiconductor laser along an original path and interacts with a light field in the active region, so that the output at narrow linewidth of a single longitudinal mode can be realized, wherein a zero-grade diffraction light is taken as an output light. The wavelength tuning of the laser is realized by the rotation of the collimating lens. When a driving device drives the collimating lens to rotate at a small angle, a collimated light beam passing through the collimating lens can deviate from an optical axis of a system, so that the angle of the light beam incident to the diffraction grating is changed, namely, the diffraction grating rotates, and the wavelength tuning is realized. The semiconductor laser can be used for implementing the rapid tuning of the wavelength of the laser, and is beneficial to the miniaturization of the system.

Description

technical field [0001] The invention relates to semiconductor laser technology, in particular to a tunable grating external cavity semiconductor laser, which can perform wavelength tuning by using a rotating collimating lens. Background technique [0002] The wavelength tuning technology of light source is an important part of laser technology. Tunable grating external cavity semiconductor laser has the advantages of wide adjustable range, good spectral purity, high conversion efficiency and good reliability. It is widely used in optical communication, optical storage, atomic physics, Measurement and other fields have broad application prospects. [0003] In the prior art, there are generally two types of tunable grating external cavity semiconductor lasers. One is a Littrow type tunable grating external cavity semiconductor laser, and the other is a Littman-Metcalf type tunable grating external cavity semiconductor laser. The following is a brief introduction to the abo...

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Problems solved by technology

Littrow-type tunable grating external-cavity semiconductor laser has the advantages of good spectral characteristics, but its structure is more complicated than Littrow-type tunable grating external-cavity semiconductor laser, so Littrow-type tunable grating external-cavity semiconductor laser is usually used

[0006] The wavelength tuning of the Littrow-type tunable grating external-cavity semiconductor laser and the Littman-Metcalf-type tunable grating external-cavity semiconductor laser is realized by rotating the diffraction grating or mirror. The angle is very sensitive, resulting in a slow tuning speed of the system, high precision requirements, and a large system volume

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