Harmonic generation is investigated at an intensity range of 10'5-10' W/cm by using a 280fsec KrF laser. The highest-order harmonic observed with Ne as a nonlinear medium is the 25th (9.9 nm), which gives the shortest-wavelength coherent radiation ever obtained. The inversions or anomalous peaks of harmonic intensity are first found at the 19-21st in Ne, the 17-19th in He, and the 11-13th in Ar. The intensity dependence of the harmonics is measured over a range of 10"-10'8 W/cm'. The observed distribution of harmonics is discussed and compared with the previous reports.Recently there has been rapid progress in the study of
A high-repetition-rate (10-Hz), terawatt excimer laser system was developed by using a discharged-pumped, wide-aperture (6 cm x 4 cm) amplifier. A new scheme of gated gain amplification was applied to the final stage for the increase of the output energy along with the suppression of the amplified spontaneous emission. An output energy of 410 mJ was obtained with a pulse width of 280 fsec and an amplified spontaneous emission of 10%, resulting in a peak power of 1.5 TW by two beams. The beam was focused by an off-axis parabolic mirror to a spot size of 2.3 microm x 2.4 microm.
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