Chapter 4 Stimulated Scattering Effects of Intense Coherent Light

Intramolecular Vibration Energy-Transfer-Driven Cascaded Stimulated Raman Scattering and Four-Wave Mixing in Benzene Series

“…To date, most fundamental studies of SRS have been done in a large number of transparent organic solvents, such as benzene, carbon disulfide, nitrobenzene, and carbon tetrachloride. − All above-mentioned liquids generally exhibit a relatively large RSCS and Kerr constant for their vibrational Raman modes and can withstand higher pump intensity to obtain cascaded high-order SRS . The SRS application had made it a focus of research for the last few decades. − Bender et al proposed optical Kerr effect spectroscopy technology by studying the relationship between the Kerr effect of benzene and temperature . He analyzed the FWM in the SRS process of benzene and observed the coherent emission components produced by FWM processes usually manifest conical shaped spatial structures and can be observed only in the forward direction .…”

“…The SRS application had made it a focus of research for the last few decades. − Bender et al proposed optical Kerr effect spectroscopy technology by studying the relationship between the Kerr effect of benzene and temperature . He analyzed the FWM in the SRS process of benzene and observed the coherent emission components produced by FWM processes usually manifest conical shaped spatial structures and can be observed only in the forward direction . Kakinuma had investigated the low-frequency dynamics of six-membered ring molecular liquids to elucidate the effects of aromaticity on the low-frequency spectra and ultrafast molecular dynamics .…”

“…When the pump intensity is slightly higher than the threshold for SRS, usually there is only a first-order Stokes SRS observed at the screen as a central spot. When the pump intensity increases to a moderate level, the second-order Stokes SRS is obtained in the same axial direction; at the same time, a ring-like second-order SRS and first-order anti-Stokes SRS can be observed corresponding to different conic angles, following the phase-matching shown in Figure …”

“…19 He analyzed the FWM in the SRS process of benzene and observed the coherent emission components produced by FWM processes usually manifest conical shaped spatial structures and can be observed only in the forward direction. 20 Kakinuma had investigated the low-frequency dynamics of six-membered ring molecular liquids to elucidate the effects of aromaticity on the lowfrequency spectra and ultrafast molecular dynamics. 21 SRS is also used to generate new laser sources with wavelengths ranging from ultraviolet to visible and infrared wavebands 22,23 The studies of various stimulated scattering effects greatly enrich our understanding and knowledge of the interaction between intense coherent light and matter.…”

“…The [01] SRS always appears with the [30] SRS peak in all four benzene series; the relative intensities of the two peaks were mutually exchanged. The first-order Stokes SRS of CH vibration cannot be generated when the [20] SRS peak was excited only. The result confirmed that the intramolecular vibration energy transfer between CC and CH existed in the benzene series, and both modes were crossing-pumped during the excitation process.…”