Ultrafast optics of solid density plasma using multicolor probes

作者：Singh Prashant Kumar; Chatterjee Gourab; Adak Amitava; Lad Amit D; Brijesh P; Kumar G Ravindra^*

来源：Optics Express, 2014, 22(19): 22320-22327.

DOI：10.1364/OE.22.022320

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 x 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.

• 出版日期2014-9-22