利用体布拉格光栅进行氮气温度测量的转动-振动混合飞秒/皮秒相干反斯托克斯拉曼散射

Rovibrational hybrid fs/ps CARS using a volume Bragg grating for N₂ thermometry.

作者信息

Scherman M, Nafa M, Schmid T, Godard A, Bresson A, Attal-Tretout B, Joubert P

出版信息

Opt Lett. 2016 Feb 1;41(3):488-91. doi: 10.1364/OL.41.000488.

DOI:10.1364/OL.41.000488

Abstract

Coherent anti-Stokes Raman scattering (CARS) spectra of N2 in the hybrid femtosecond/picosecond regime have been recorded with 0.7 cm(-1) resolution. The Q-branch rovibrational structure has been resolved, making it suitable for gas-phase simultaneous rotational and vibrational thermometry applications. Resolving this spectral structure requires synchronization of a narrowband picosecond probe pulse with a broadband femtosecond pair of pump and Stokes pulses. It is achieved using a single femtosecond ytterbium-laser source and a volume Bragg grating in a compact experimental arrangement.

摘要

在飞秒/皮秒混合区域中记录了N₂的相干反斯托克斯拉曼散射（CARS）光谱，分辨率为0.7 cm⁻¹。已分辨出Q支转动振动结构，使其适用于气相同时进行转动和振动温度测量应用。解析这种光谱结构需要将窄带皮秒探测脉冲与宽带飞秒泵浦脉冲和斯托克斯脉冲对同步。这是通过在紧凑的实验装置中使用单个飞秒镱激光源和体布拉格光栅实现的。