DUAL-FREQUENCY COMB SPECTRAL FOCUSING COHERENT ANTI-STOKES RAMAN SPECTROSCOPY DETECTION SYSTEM

摘要

A dual-frequency comb spectral focusing coherent anti-Stokes Raman spectroscopy detection system, comprising a dual-frequency comb light source module (1), a Stokes light generating module (5), a microfocus and sample scanning module (9), a sampling triggering module (12), a coherent anti-Stokes signal detection module (11), a collection module (13) and an analysis processing module (14). The dual-frequency comb light source module (1) comprises a first frequency comb light source (1-1) and a second frequency comb light source (1-2), having a slight difference in repeat frequency, light output by the first frequency comb light source (1-1) acting as a pump light and a detection light in the detection process; the Stokes light generating module (5) uses a nonlinear effect of optical fiber to realize a frequency shift, obtaining Stokes light; the sampling triggering module (12) uses a secondary harmonic generation technique to obtain overlap positions of two frequency comb pulses, causing pulse positioning to trigger spectrum collection. The present detection system realizes non-mechanical scanning rapid broadband coherent anti-Stokes Raman spectroscopy detection, significantly increasing the capability of broadband coherent anti-Stokes spectroscopy technology in highly dynamic, multi-component detection analysis.