Experimental diagnostic module for ultrafast combined interferometry of the processes of interaction of ultrashort laser pulses with condensed media in vacuum

Loktionov, E. Yu.; Ovchinnikov, A. V.; Protasov, Yu. Yu.; Sitnikov, D. S.
May 2010
Instruments & Experimental Techniques;May2010, Vol. 53 Issue 3, p416
Academic Journal
An experimental diagnostic module based on a femtosecond laser system (τ0.5 ∼ 45-70 fs, 7n = 266, 400, and 800 nm) and the experimental technique for ultrafast combined interferometric investigation of the interaction of ultrashort laser pulses with condensed media in vacuum are described. A combined interferometric microscope built according to the Michelson and Mach-Zehnder schemes allows studies of the dynamics of optico-thermophysical and gas-dynamic proc esses at the surface of a target (the crater depth and diameter, optical properties) and in a plasma plume (velocity of expanding particles, electron density, optical characteristics) at a time resolution of 5 - 10-14 s in the range of delays 10-13-10-7 susing two probing wavelengths (7n = 400, 800 nm) in vacuum (to 5 - 10-5 mbar). Setting a mechanical shutter in the reference arm of the interferometer also allows obtaining of shadow photographs without changing the optical scheme.


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