Abstract
We observed a strong change in the frequency of coherent THz phonons from 1.4 to 4.6 THz under tight focusing (NA ~ 0.4) of intense femtosecond laser radiation (~ 1013 W/cm2) ignited the plasma within a bulk of quartz. Strong frequency shifts are caused by local heating of a microvolume (4 × 4 × 60 μm3) up to the temperature close to the α-β phase transition (846 K) of quartz. The effective target heating and coherent phonon excitation are provided via a laser-induced plasma.
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