Open AccessUltrafast optics of solid density plasma using multicolor probes
Author(s) -
Prashant Kumar Singh,
Gourab Chatterjee,
Amitava Adak,
Amit D. Lad,
P. Brijesh,
G. Ravindra Kumar
Publication year - 2014
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.22.022320
Subject(s) - optics , ultrashort pulse , picosecond , plasma , materials science , wavelength , absorption (acoustics) , bremsstrahlung , atomic physics , laser , physics , photon , quantum mechanics
We present time-resolved reflectivity and transmissivity of hot, overdense plasma by employing a multicolor probe beam, consisting of harmonics at wavelengths of 800 nm, 400 nm and 266 nm. The hot-dense plasma, formed by exciting a fused silica target with a 30 fs, 2 × 10(17) W cm(-2) intensity pulse, shows a sub-picosecond transition in reflectivity (transmissivity), and a wavelength-dependent fall (rise) in the reflected (transmitted) signal. A simple model of probe absorption in the plasma via inverse bremsstrahlung is used to determine electron-ion collision frequency at different plasma densities.