A robust, alignment-free broadband CARS system based on stimulated processes in heavy water

• Published in: Applied physics. B, Lasers and optics Vol. 123; no. 6; pp. 1 - 7
• Main Authors: Yuan, Hong, Gai, Baodong, Liu, Jinbo, Guo, Jingwei, Cai, Xianglong, Xia, Xusheng, Li, Xueyang, Zhang, Baichao, Deng, Liezheng, Jin, Yuqi
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.06.2017; Springer Nature B.V
• Subjects: Alignment; Applied physics; Brillouin zones; Broadband; Coherent scattering; Color; Dyes; Energy distribution; Energy measurement; Engineering; Fluid flow; Heavy water; Laser beams; Lasers; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Physics and Astronomy; Quantum Optics; Raman spectra; Rhodamine; Robustness; Time measurement
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-017-6753-4

We have established a new method for realizing a typical “2-color” collinear CARS (coherent anti-Stokes Raman scattering) system. The system mainly consists of a laser source, a D 2 O cell, and a spectrometer. The pump/probe beam and the Stokes beam are provided by SBS (stimulated Brillouin scattering) and BSRS (backward stimulated Raman scattering) of D 2 O, respectively. The CARS system is statistically stable, and it is also a broadband and alignment-free system. Measurement of N 2 signal in air with this system is demonstrated. Detection of N 2 in 0.006 bar air is realized with this system. Time-resolved pulse shapes of SBS and BSRS are measured to confirm their generation. Transference of energy from the SBS pulse to the BSRS pulse is realized with a Rhodamine 101 dye cuvette and discussed. This results in a better energy distribution between the pump/probe and Stokes pulses for CARS.