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We aim to reach power up to a petawatt level (1015 Watt) in laser pulses with duration of tens femtoseconds (10-14s). The pulses will be used for a study of new effects in ultra-high electromagnetical fields. We concentrate on an ultra-short pulse propagation in media and a technique of pulse amplification up to 30 terawatts (30×1012 W).
Celý text >>Our hybrid lasers are set up by an association of proper solid-state and gas laser media in a single laser system, which can exploit advantages of both media. The solid-state laser can provide an easier control of pulse shape or a higher energy extraction to the amplified pulse, for example. The gaseous iodine laser could have a narrower gain linewidth and, particularly, a more homogenous beam profile, which is important for the ultra-high-power pulse generation. Celý text >>
We prepare a system for optical parametric amplification of femtosecond pulses by the technique of optical parametric chirped pulse amplification (OPCPA). We also develop a model of Raman laser, which is an efficient convertor of laser wavelength. We plan to expand the research of laser interaction with matter in the future.
Celý text >>A fully automatic alignment system for a pulsed infrared laser beam was developed and tested. The system allows:
The hybrid iodine photodissociation laser SOFIA has been constructed. The pulse feeding the amplifier chain is the idler wave of an optical parametric oscillator (OPO) tuned to the atomic iodine transition at 1315 nm. This solid-state oscillator enables ps-synchronization to other laser systems. A homemade automatic stabilization of the OPO idler wave as to wavelength and pointing ensures long-term stable operation of the whole system. The active medium of the SOFIA amplifiers is a mixture of C3F7I and He. The SOFIA pulses are frequency-tripled in two KD*P crystals and then serve as the driver in a two-stage optical parametric amplification scheme in which chirped broadband Ti:sapphire laser pulses are amplified (OPCPA).
A minute, yet practical, modification of a well-known spectrograph based on a set of wedged narrow band filters is presented. It makes possible two-dimensional-imaging spectral measurements with a potential subpixel precision of a few micrometers. The simple spectroscopic device can evaluate dispersion of quantities which can be transformed into an image, e.g., into a spatial beam distribution. The spectrograph was used to measure angular dispersion of both a laser oscillator producing femtosecond pulses and a simple dispersive optical system, an optical wedge.
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Copyright © 2008, Fyzikální ústav AV ČR, v. v. i.
