Determination of fs-vibrational relaxation times of dyes by broadband ns-CARS

Andreas Kummrow; A. Lau; H. G. Ludewig; S. Woggon

doi:10.1117/12.197444

2 January 1995 Determination of fs-vibrational relaxation times of dyes by broadband ns-CARS

Andreas Kummrow, A. Lau, H. G. Ludewig, S. Woggon

Proceedings Volume 2370, 5th International Conference on Laser Applications in Life Sciences; (1995) https://doi.org/10.1117/12.197444
Event: Laser Applications in Life Sciences: 5th International Conference, 1994, Minsk, Belarus

Abstract

Interferometric coherent anti-Stokes Raman scattering (ICARS) using non-transform-limited broadband ns-dye lasers is used for time-resolved measurements of vibrational frequency and dephasing time of solutions of bis-(dimethylamino)heptamethinium iodide and all-trans- (beta) -carotene. The results are compared with those obtainable from conventional narrowband scanning CARS. The intensity of the strongest Raman lines of all-trans-(beta) - carotene (1523 cm^-1 and 1153 cm^-1) decrease for a Stokes laser power density exceeding 1 GW/cm² ((lambda) approximately equals 550 nm). ICARS reveals a simultaneous broadening of the 1523 cm^-1 line from 11 cm^-1 to 25 cm^-1.

Citation Download Citation

Andreas Kummrow, A. Lau, H. G. Ludewig, and S. Woggon "Determination of fs-vibrational relaxation times of dyes by broadband ns-CARS", Proc. SPIE 2370, 5th International Conference on Laser Applications in Life Sciences, (2 January 1995); https://doi.org/10.1117/12.197444

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