A method for generating ultra-wideband optical radiation based on a chirp pulse optical parametric oscillator

Abstract

The invention discloses a method for generating ultra-wideband optical radiation based on a chirp pulse optical parametric oscillator. The method includes as the steps of: determining pump light of acorresponding wave band and corresponding second-order nonlinear crystal according to the wavelength of required ultra-wideband optical radiation; determining the length of the second-order nonlinearcrystal according to the bandwidth of the required ultra-wideband optical radiation, and determining the pulse width of the pump light according to the second-order nonlinear crystal; designing a third-order nonlinear optical parametric oscillator (OPO) to ensure the existence of self-phase modulation (SPM) in the OPO cavity, so as to obtain the spectral broadening. By introducing enough third-order nonlinear effect into the resonant cavity to make the optical parametric oscillator work in the mode of chirped pulse, and precisely controlling the intracavity net dispersion through a dispersionadjusting element in the cavity, the optical parametric oscillator outputs ultra-wideband optical radiation close to the second-order nonlinear crystal phase matching bandwidth.

Description

technical field [0001] The invention belongs to the field of mid-infrared light sources, and more specifically relates to a method for generating ultra-broadband optical radiation based on a chirped pulse optical parametric oscillator. 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 ultra-broadband mid-infrared light sources can be used to achieve highly sensitive identification and quantitative detection of molecules. [0003] The thermal light source based on blackbody radiation is the most commonly used broadband light source at present; however, the blackbody radiation thermal light source is an incoherent light source with low spectral brightness, so the signal-to-noise ratio and efficiency obtained when used for spectral measurement are low. The difference frequency ge...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide a method for generating ultra-broadband optical radiation based on a chirped pulse optical parametric oscillator, aiming to solve the problem that the current mid-infrared light source cannot have both wide-spectrum output and high-spectral brightness

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