Femtosecond laser produced plasmas
are violent objects with extreme conditions of temperature and pressure
and so it is a bright source of electromagnetic radiation and high charge
state ions with energies extending from fraction of an electron volt to
million electron volts (MeV). Usual electron temperatures are as high
as a few hundred keVs.
We are looking at the generation, optimisation and applications
of fs X-ray sources. This physics underlying the efficient laser-plasma
coupling schemes, plasma heating and X-ray generation are being investigated
with a number of low Z and high Z targets. The main objective of the present
experiments is to provide a predictable X-ray source for applications
in time resolved pump-probe experiments. Extremely short pulse durations
and large flux can be made use of to study the lattice dynamics and transient
chemical reaction dynamics. The very low exposure dose compared to continuous
sources is useful for imaging living cells.
Through High Harmonic Generation, femtosecond or sub-femtosecond
coherent pulses are generated in the VUV to soft X-ray region with laser
intensities of the order of 1015-1016 W/cm2.
There is excellent progress in this area across the world, but phase matching
of the generated field with the fundamental is one of the challenges towards
attaining maximum efficiency. Here in SILIS we are looking at various
phase matching schemes using modulated capillary wave guides and capillary
discharges and we hope to provide the beam for applied research in science