Device for generating supercontinuum white laser and method for making nonlinear laser crystal

Abstract

The invention provides a device for generating a supercontinuum white laser. The device comprises a pump light source and a nonlinear laser crystal, wherein the pump light source is a mid-infrared femtosecond pulse laser light source and the frequency of the femtosecond pulse laser provided by the pump light source covers a mid-infrared section, and the femtosecond pulsed laser has the characteristics of high peak power, The nonlinear laser crystal is made of ferroelectric crystal material and comprises a series of cells, and the length of the cells along the light propagation direction changes in accordance with the rules of continuous chirp changes along the light propagation direction. The device can generate supercontinuum and completely coherent white laser in a visible optical band and has the advantages of controllable structure, easy preparation, design flexibility, high energy conversion efficiency, ultra-wideband laser spectrum, supercontinuum and small size.

Description

technical field [0001] The invention relates to the field of laser technology, in particular, the invention relates to a device for generating supercontinuous white light laser and a method for making a corresponding nonlinear laser crystal. Background technique [0002] Lasers have huge and extensive applications and values ​​in various fields of social life, industrial production, information and communications, medical and health care, and national defense and military, such as laser processing, detection, remote sensing, imaging, ophthalmic surgery, infrared night vision imaging, laser weapons, Controlled nuclear fusion, etc. Laser technology has grown tremendously over the past few decades. However, due to the energy level limitation of the gain medium, the laser cannot produce output at any frequency. In order to obtain the laser at the desired frequency, people often need to use nonlinear frequency conversion techniques (frequency doubling, sum frequency, difference...

AI Technical Summary

Problems solved by technology

However, this solution still has shortcomings such as low conversion efficiency and insufficient spectral broadening range (difficult to achieve white light coverage).

Moreover, the supercontinuum laser source in this scheme is not a completely coherent laser source, that is, the radiated light is a coherent laser in a specific narrow band, but there is no good coherence between the radiated light of different colors, which limits The scope of application of the light source

For example, it is impossible to use the supercontinuum laser source to generate ultrashort pulse laser

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