调谐光频梳干涉光谱技术的改进与标定研究

Study on Improvements and Characterizations of Wavelength Tuning Frequency Comb Interference Spectroscopy

光频梳为高分辨分子光谱测量提供了理想光源。基于两台异步光梳的双光梳光谱技术能够在射频域解析光梳梳齿,具有光谱范围宽、分辨率高、精度高及测量时间短的优势。但是该技术存在系统复杂度高且对环境噪声敏感等问题,限制了其在工业领域的应用。探索并改进了基于单台光梳与连续激光器拍频的光梳干涉光谱技术(FCIS)。通过高频电子器件与高速数据采集系统,单次成谱范围拓展至66 GHz(0.5 nm),使其在10μs内实现对660个纵模频谱的一次性测量。试验对乙炔、氰化氢气体的近红外分子谱线进行了高分辨测量。谱分辨率达50 MHz(0.4 pm),谱线精度0.3 pm。试验结果与HITRAN标准数据一致,证明了系统能够用于快速、高精度的气体光谱测量与定量分析。研究为探索适用于工业气体监测的高分辨光梳光谱技术提供了参考。

Optical frequency comb provides an ideal light source for high-resolution molecular spectroscopy.Dual-comb spectroscopy relying on two asynchronous optical combs can analyze the optical comb teeth in the radio frequency domain.It has the advantages of wide spectral range,high resolution,high precision,and short measurement times.However,its application in industrial fields is limited due to its high system complexity and susceptibility to environmental noise.This paper explores and enhances frequency comb interference spectroscopy(FCIS)technology based on optical heterodyne detection between a single optical comb and a continuous-wave laser.Through high-frequency electronic devices and high-speed data acquisition system,the single-shot spectral range is expanded to 66GHz(or 0.5 nm),so that it can realize the simultaneous measurement of 660 longitudinal modes within 10μs.The near-infrared molecular spectra of acetylene and hydrogen cyanide were measured with high resolution.The spectral resolution reaches 50 MHz(0.4 pm)and the spectral precision is 0.3 pm.The experimental results are consistent with the HITRAN database,showing that the system can be used for rapid and high-precision gas spectral measurement and quantitative analysis.This study thus offers valuable insight into advancing high-resolution optical comb spectroscopy technology suitable for industrial gas monitoring.