Laser System:
A terawatt high intensity titanium-sapphire – KrF excimer laser system is operated in our laboratory. The laser system has three main parts:
- titanium-sapphire laser system as front end to generate seed pulses;
- KrF excimer preamplifier to preamplify seed pulses with help of two amplification stages;
- main (power) amplifier to amplify our pulses.
Inbetween two amplification stages of excimer preamplifier a spatial filter has been installed to filter amplified spontaneous emission (ASE) of excimer pulses. Laser pulses are compressed by a grating compressor pair placed in front of ASE spatial filter. In front of the power amplifier a beam expander telescope is installed to expand the beam to the correct size. Behind the power amplifier the main beam parameters are:
- pulse energy: ~ 450 mJ
- pulse duration: ~ 200 fs
- wavelength: 248 nm
- beam size: ~ 10 cm (4 inches) in diameter
 Laser System |
 Spatial Filter |
 Preamplifier |
 Basic scheme of the high intensity laser system |