Dual-wavelength laser output device and method and semiconductor laser

Abstract

The invention provides a dual-wavelength laser output device, which is applied to the technical field of optics. The device comprises a light source module used for outputting polarized light in different polarization states; a reflection grating which is used for performing first-order diffraction on the light beam with the first specified wavelength in the polarized light to obtain diffraction light with the first specified wavelength, and performing zero-order diffraction on the polarized light to obtain zero-order diffraction light; a total reflection mirror which is used for reflecting the diffracted light with the first specified wavelength to the reflection grating; a volume Bragg grating which is used for diffracting a light beam with a second specified wavelength in the zero-order diffracted light to obtain diffracted light with the second specified wavelength; and a reflection grating which is also used for performing first-order diffraction on the diffracted light with the first specified wavelength to the light source module and performing zero-order diffraction on the diffracted light with the second specified wavelength to the light source module. The invention further discloses a dual-wavelength laser output device and method and a semiconductor laser, and dual-wavelength laser with equal intensity can be output.

Description

technical field [0001] The present application relates to the field of optical technology, in particular to a dual-wavelength laser output device and method, and a semiconductor laser. Background technique [0002] Dual-wavelength laser is a laser beam that can emit two wavelengths at the same time, and can be widely used in dual-wavelength interference imaging, optical switches, terahertz pumping sources, terahertz pumping sources, optical sensing and other fields. For example, using a dual-wavelength tunable pumping source to output phase-matched two beams of laser wavelengths with similar wavelengths, the dual-wavelength laser interacts with a nonlinear medium with a good second-order nonlinear coefficient to generate a difference frequency, and finally obtains terahertz radiation. [0003] At present, there are two main methods for realizing dual-wavelength laser output: 1. A monolithic integrated semiconductor laser, which achieves stable dual-wavelength through complex...

AI Technical Summary

Problems solved by technology

The laser output of dual-wavelength external cavity structures generally has the characteristics of high power, but the advantages and disadvantages of different external cavity structures are also significant.

For the dual VBG external cavity structure, the side mode suppression ratio of the output laser is high, but the wavelength difference between the two wavelengths cannot be tuned; for the external cavity structure such as the double Littrow external cavity structure using surface gratings, the tunable range is wide, but the side mode of this structure The suppression ratio is not high; for the composite cavity structure using VBG and surface grating at the same time, because the diffraction efficiency of the surface grating for different wavelengths of the same polarization state is not high, the output intensity of the two wavelengths will be different

Images