Femtosecond wide-spectrum difference frequency intermediate infrared laser

Abstract

A femtosecond wide-spectrum difference frequency intermediate infrared laser comprises a seed light source module, a separation pulse amplification module, a 2 [mu]m wide-spectrum generation module and a difference frequency module. The seed light source module is used for generating a semiconductor laser light source for mode-locked pulses as a seed light source, and two beams of difference frequency light provide signal sources after beam splitting through an output coupler and are output and connected to the separation pulse amplification module and the 2 [mu]m wide-spectrum generation module respectively. The separation pulse amplification module is used for generating high-power femtosecond pulse laser in the separation pulse amplification mode and generating femtosecond pulse laser with the maximum W magnitude. The 2 [mu]m wide-spectrum generation module is used for tuning and amplifying by adopting a tunable optical filter to generate a wide spectrum from 1700 nm to 2000 nm at a hundred milliwatt magnitude. The difference frequency module is used for generating difference frequency through the nonlinear crystal by using the time and space coincidence of the high-frequency light and the low-frequency light of the nonlinear crystal so as to generate intermediate infrared laser. The problem that the tunable wavelength of an existing difference frequency intermediate infrared laser is short is solved, a wide spectrum is generated, the wavelength range is expanded, and the application range of the laser is wider.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a mid-infrared difference frequency generating laser. Background technique [0002] Mid-infrared band (wavelength is 3 ~ 12μm) laser has important applications in industry, medicine, communication and so on. In the field of laser processing, 6μm band laser plays an important role in laser cutting, welding and other applications of plastic materials. Plastic materials are basically transparent to lasers from ultraviolet to near-infrared. In addition, many important hydrocarbon gas and other toxic gas molecules There are strong characteristic absorption peaks in the 3-12μm band. Therefore, the mid-infrared laser can be used to measure the molecular spectrum of toxic gases, organic substances, etc. Because the mid-infrared band is in the transparent window of the atmosphere, it has a high transmittance for smoke, and is less scattered by molecules when it is transmitted in the air....

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned deficiencies of the prior art. In order to overcome the deficiencies of the prior art, a solution is provided, which provides a wider spectrum for the DFG technology by using a tunable filter, and solves the problem of existing mid-infrared lasers. Difficult structure, complex system, narrow bandwidth, etc.

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