Semiconductor laser with wavelength capable of tuning without mode skip

Abstract

The invention discloses a semiconductor laser with wavelength capable of tuning without mode skip, which comprises a passive resonance cavity, a gain wave guide 2 and a passive wave guide 3. Only light wave of resonant wavelength of the passive resonance cavity can generate resonance in the laser with minimum consumption. A tuning zone exists in the laser, and the index of refraction of the tuning zone can be changed through exterior means, so that the resonant wavelength of the laser can be changed, and the aim of wavelength tuning can be realized. The tuning zone comprises a part of a thirdwave guide 11 of the passive resonance cavity and a part of a first wave guide 31 of the passive wave guide 3, and conformance of the tuning velocity on the tuning wavelength of the passive cavity and the tuning velocity on the tuning wavelength of the laser can be realized through properly selecting the length of the third wave guide 11 and the length of the first wave guide 31, so that tuning without mode skip on the laser wavelength can be realized only through changing the index of refraction of the tuning zone without any extra synchronous tuning mechanism.

Description

A semiconductor laser whose wavelength can be tuned without mode hopping Technical field The present invention relates to a semiconductor laser, in particular to a semiconductor laser with tunable wavelength. Background technique In many application fields such as interferometry, spectroscopy, optical communication, etc., it is hoped to obtain a tunable laser source without wavelength mode hopping. Lasers generally change their output wavelength by adjusting the optical properties of the resonator. When the optical properties of the resonator are continuously tuned, the laser's excitation mode sometimes suddenly jumps from one wavelength to another. This is called mode hopping. Taking wavelength scanning interferometry as an example, mode hopping has an adverse effect on the spatial resolution, position accuracy and other distance / depth-dependent characteristics of distance measurement. In order to realize the wavelength adjustment without mode hopping, when the wavelength is...

AI Technical Summary

Problems solved by technology

The synchronization requirement for the two control units increases the complexity and cost of the equipment, and it is very difficult to keep synchronized due to factors such as the age of the laser or environmental conditions

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