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Efficient generation of coherent THz phonons with a strong change in frequency excited by femtosecond laser plasma formed in a bulk of quartz

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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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Authors and Affiliations

  1. Faculty of Physics and International Laser Centre, Moscow State University, 119991, Moscow, Russia

    F.V. Potemkin & P.M. Mikheev

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  1. F.V. Potemkin
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  2. P.M. Mikheev
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Correspondence to F.V. Potemkin.

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Potemkin, F., Mikheev, P. Efficient generation of coherent THz phonons with a strong change in frequency excited by femtosecond laser plasma formed in a bulk of quartz. Eur. Phys. J. D 66, 248 (2012). https://doi.org/10.1140/epjd/e2012-30048-x

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  • DOI: https://doi.org/10.1140/epjd/e2012-30048-x

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