Spectrally resolved detection in transient-reflectivity measurements of   coherent optical phonons in diamond
  Coherent optical phonons in bulk solid system play a crucial role in understanding and designing light-matter interactions and can be detected by the transient-reflectivity measurement. In this paper, we demonstrate spectrally resolved detection of coherent optical phonons in diamond from ultrashort infrared pump-probe measurements using optical band-pass filters. We show that this enhances the sensitivity approximately 35 times in measuring the coherent oscillations in the transient reflectivity compared with the commonly used spectrally integrated measurement. To explain this observation, we discuss its mechanism. 
Kazutaka G. Nakamura, Kazuma Ohya, Hiroshi Takahashi, Tetsuya Tsuruta,   Hiroya Sasaki, Shin-ichi Uozumi, Katsura Norimatsu,...
cond-mat.mes-hall physics.optics