Coherent optical phonons in alexandrite crystal studied by Optical Kerr Effect spectroscopy

Abstract

Herewith, we report on the first observation of coherent phonons in alexandrite crystal obtained by means of the femtosecond Optical Kerr Effect spectroscopy. We have managed to observe dynamics of the Raman‐active modes with high resolution and to find their lifetimes in the temperature range between 263 K and 373 K. We have used the obtained temperature dependence of phonon lifetimes and frequencies for calculation of the anharmonic coupling constants. On the basis of our results, we have also calculated the widths of homogeneously broadened Raman lines. Our results prove that, in case of transparent samples, this experimental technique is a very good alternative to the commonly used transient reflection method. Copyright © 2013 John Wiley & Sons, Ltd.

Recent advances in linear and nonlinear Raman spectroscopy. Part VIII

“…used optical Kerr Effect spectroscopy to report the first observation of coherent optical phonons in alexandrite crystals. Their results prove that, in case of transparent samples, this experimental technique is a very good alternative to the commonly used transient reflection method …”

“…Their results prove that, in case of transparent samples, this experimental technique is a very good alternative to the commonly used transient reflection method. [198] Metals and other crystalline materials Bacchi and coworkers presented a Raman investigation of polymorphism in 1,1,4,4-tetraphenylbutadiene (TPB), a well-known blue luminescent molecule, which retains its emissive properties in the solid-state. Lattice dynamics calculations yielded a preliminary assignment of the low-wavenumber Raman spectra and provide information of the relative stability of the phases.…”