Toru Shimada, N. Kamaraju, Christian Frischkorn, Martin Wolf and Tobias Kampfrath:
Appl. Phys. Lett. 105, 111908 (2014), pp 4;
We irradiate a ZnTe single crystal with 10-fs laser pulses at a repetition rate of 80MHz and investigate its resulting gradual modification by means of coherent-phonon spectroscopy. We observe the emergence of a phonon mode at about 3.6 THz whose amplitude and lifetime grow monotonously with irradiation time. The speed of this process depends sensitively on the pump-pulse duration. Our observations strongly indicate that the emerging phonon mode arises from a Te phase induced by multiphoton absorption of incident laser pulses. A potential application of our findings is lasermachining of microstructures in the bulk of a ZnTe crystal, a highly relevant electrooptic material.
The original publication is available by link DOI: 10.1063/1.4896039