We show that the propagation of coherent acoustic phonons generated by femtosecond optical excitation can be clearly resolved using a probe laser in the middle UV (MUV) range. The MUV probe is easily produced from a high-repetition-rate femtosecond laser and a homemade frequency tripler. We present various experimental results that demonstrate efficient and high frequency detection of acoustic phonons. Thus, we show that the MUV range offers a unique way to reach higher frequencies and probe smaller objects in ultrafast acoustics.
© 2010 Optical Society of America
Original Manuscript: June 7, 2010
Manuscript Accepted: September 9, 2010
Published: October 15, 2010
S. Ayrinhac, A. Devos, A. Le Louarn, P.-A. Mante, and P. Emery, "Ultrafast acoustics in the middle UV range: coherent phonons at higher frequencies and in smaller objects," Opt. Lett. 35, 3510-3512 (2010)