Coherent anti-Stokes Raman spectrum measurement system and method based on double optical frequency combs

Abstract

The invention discloses a coherent anti-Stokes Raman spectrum measurement system and method based on double optical frequency combs. According to the coherent anti-Stokes Raman spectrum measurement system and method based on the double optical frequency combs, optical frequency comb repetition frequency parameters of a first pulse transmitting module or a second pulse transmitting module are adjusted; the optical frequency comb repetition frequency difference value of the first pulse transmitting module and the second pulse transmitting module does not exceed the repetition frequency difference threshold value, the signal-to-noise ratio of spectrum collection is enhanced by selecting a proper dual-optical frequency comb repetition frequency parameter range, and then when a non-resonant four-wave mixing background with certain intensity is detected through a photoelectric detection element, the spectrum collection accuracy is improved. A signal acquisition triggering instruction is sent to the spectrum acquisition module, so that after the spectrum acquisition module receives the signal acquisition triggering instruction, after a preset waiting time and after the four-wave mixing background light signal is weakened, the spectrum signal of the pulse laser is acquired; the technical problem that spectral data acquisition and measurement are difficult due to off-resonance four-wave mixing interference in existing coherent anti-Stokes Raman spectrum measurement is solved.

Description

technical field [0001] The present application relates to the field of optical technology, and in particular, to a coherent anti-Stokes Raman spectroscopy measurement system and method based on dual optical frequency combs. Background technique [0002] Raman scattering spectroscopy is widely used in chemical analysis, chemical detection, biomedical imaging and other fields. Coherent Raman scattering is a technique to improve the signal-to-noise ratio of Raman spectroscopy by applying ultrafast laser pulse technology. Coherent anti-Stokes Raman scattering is a nonlinear optical process of Raman scattering based on four-wave mixing of laser pulses. It requires three beams of light to work together to generate a coherent Raman signal. For the pump light, Stokes light, probe light. Ultrafast pulsed light is generally used to generate coherent anti-Stokes Raman scattering, because the intensity of the pulsed light is high, so the nonlinearity is stronger, and the resulting coh...

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Problems solved by technology

[0003] This application provides a coherent anti-Stokes Raman spectrum measurement system and method, which are used to solve the problem of spectral data acquisition and measurement caused by non-resonant four-wave mixing interference in the existing coherent anti-Stokes Raman spectrum measurement difficult technical issues

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