Vibration-selective coherent anti-Stokes Raman scattering with linearly chirped white-light pulses

線形チャープ白色光パルスを用いた振動選択CARS

笠嶋 辰也; 横山 啓一  ; 松岡 雷士; 横山 淳

Kasajima, Tatsuya; Yokoyama, Keiichi; Matsuoka, Leo; Yokoyama, Atsushi

A practical extension of selective excitation using broadband laser is reported. A specific molecular vibration is excited by stimulated Raman scattering induced by a pair of linearly chirped white-light pulses (650-900 nm). The white-light pulse is generated by filamentation produced in a focused Ti:sapphire laser beam (30 fs, 1.8 mJ/pulse). The excited amplitude is probed by coherent anti-Stokes Raman scattering using the third pulse with a narrow bandwidth (769.9 1.5 nm). As a demonstration, the N and O molecules are respectively excited at different time intervals of the pulse pair without changing the wavelength region of the light source.