Abstract
Progress on developing a petawatt laser source in 10&mgr;m region is described. Analysis of optical pumping N<sub>2</sub>O containing active media by pulsed multifrequency HF laser has been performed. It is shown that amplification of ultrashort pulses should be carried out in the gain band centered at 930cm<sup>-1</sup>. Amplification of seed ultrashort (~1ps) pulses in atmospheric and high pressure N<sub>2</sub>O (up to 5atm) amplifiers pumped by powerful pulsed HF chemical lasers is theoretically studied. It is shown that N<sub>2</sub>O atmospheric pressure amplifiers can be effectively used for production output energy of 1kJ. We discuss a simple add for subpicosecond N<sub>2</sub>O- laser system to generate joule-level 200 fs pulses with high temporal quality and an overall conversion efficiency of 80%. Petawatt class N<sub>2</sub>O laser could be prospective for strong-field physics applications and production of high energy proton beams upon irradiating gas jets.
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