Apparatus and method for generating broadband optical radiation based on chirped nonlinear crystals

Abstract

The invention discloses a device and method for generating broadband light radiation based on a chirp nonlinear crystal. The device is a synchronous pump optical parametric oscillator based on a chirpperiodically-designed quasi-phase matching second-order nonlinear crystal, so that the device can generate broadband light radiation; period lengths at different positions of the chirp periodically-designed quasi-phase matching second-order nonlinear crystal are different, and different periods are corresponding to phase matching at different wavelengths; when pump light generated by a pumping source passes through the crystal, different signal wavelengths will be generated at different positions of the crystal; cavity mirrors are arranged at two ends of the crystal respectively; and a resonant cavity is provided with a dispersion function element which enables dispersion so as to reduce net dispersion in the resonant cavity. The chirp periodically-designed quasi-phase matching second-order nonlinear crystal is adopted. Compared with the prior art, the device of the invention can assist in solving the problems of high requirements for components, complex structure and the like of a broadband optical radiation device in the prior art.

Description

technical field [0001] The invention belongs to the technical field of broadband optical radiation control, and more specifically relates to a device and method for generating broadband optical radiation based on a chirped nonlinear crystal. The device and method are based on a chirped nonlinear crystal optical parametric A quasi-phase-matched second-order nonlinear crystal synchronously pumped optical parametric oscillator designed with a chirp period is used to generate broadband optical radiation, which can generate radiated light with a bandwidth not lower than the spectral bandwidth of the pump light. Background technique [0002] Spatially coherent ultra-broadband light sources are widely used in scientific research, component measurement, material composition detection, medical diagnosis, imaging and other fields. For example, spatially coherent broadband mid-infrared light sources can be used to achieve high-sensitivity identification and quantitative detection of mu...

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a device and method for generating broadband optical radiation based on a chirped nonlinear crystal, wherein the various components of the device and their working relationship with each other are improved , especially the use of quasi-phase-matched second-order nonlinear crystals based on chirp period design, compared with the prior art, can effectively solve the problems of broadband optical radiation devices requiring high-function components or complex structures.

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