The realization method of spectral high-resolution coherent anti-Stokes Raman scattering light source

Abstract

The invention relates to a spectrum high-resolution coherent anti-Stokes Raman scattering light source implementation method. A pump source portion is divided into n+1 parts, wherein one part of pumplight can generate required signal lights through an optical parametric oscillator, and the other parts of pump light are sequentially combined with the transmitted signal light, and the combined signal light sequentially passes through n optical parametric amplifiers, so that the power of the signal light can be continuously amplified, and the spectral width of the signal light can be narrowed, and therefore, a spectrum high-resolution CARS (coherent anti-Stokes Raman scattering) light source can be realized; the four-wave mixing effect of photonic crystal optical fibers is utilized to realize optical frequency conversion; different photonic crystal optical fibers can be selected, so that CARS source output of different bands can be realized; the optical parametric amplifiers amplify signals of specific wavelength ranges, and thus, the selection of the photonic crystal optical fibers is equivalent to the addition of a spectral filtering effect, and narrow-spectral width laser can be realized, the frequency resolution of CARS spectral analysis can be improved; homologous parametric oscillators and cascade optical parametric amplifiers can be made of the same parametric medium, andtherefore, the coherence of the parametric signal light can be maintained, and the signal to noise ratio of the laser can be improved.

Description

technical field [0001] The invention relates to a laser technology, in particular to a method for realizing a spectrally high-resolution coherent anti-Stokes Raman scattering light source. Background technique [0002] Since the first discovery of the CARS phenomenon by American scientists in 1965, the CARS technology has increased the signal intensity by 10% compared with spontaneous Raman scattering. 6 ~10 9 And received much attention. In 1982, scientists from the U.S. Naval Laboratory combined CARS technology with optical microscopes, making CARS microscopic imaging technology widely used in the research of biology, medicine and other fields. In 1999, the National Laboratory of the United States changed the layout of the light source device of coherent anti-Stokes Raman scattering CARS from a non-collinear device to a collinear device, which simplified the CARS microscopic imaging system and triggered a research boom in CARS microscopic imaging. In recent years, CARS ...

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And it is difficult to realize the wavelength tuning of the signal light by using the frequency doubling crystal

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