INTERACTION OF 1.3 MM LASER RADIATION WITH THIN FOIL TARGETS
Comprehensive studies of the hydrodynamics and energy transport in laser produced plasmas are presented. Thin low-Z foil targets (10**-5 to 10**-3 g/cm**2) were irradiated with 300 ps pulses from the Asterix-III iodine laser (lambda = 1.3 mum). Different diagnostics such as high speed photography, plasma calorimetry, Ulbricht sphere for laser light absorption measurements, and x-ray and ion techniques were used. Results on the velocity and energy of the accelerated foil, pressure, ablation rate, and lateral energy spread were obtained for a wide intensity range 10**11+10**16 W/cm**2. Pressures exceeding 10 Mbar and foil velocities of up to 10**8 cm/s were observed. The experimental data are compared with one-dimensional hydrodynamic calculations using different values of electron heat flux limitation. An indication of intensity dependent flux inhibition was found: integral-p-delta >= 0.1 at intensities below 10**13 W/cm**2, but integral-p-delta + z < 0.015 +- 0.03 at intensities above 10**14 W/cm**2.
Bibliographic Reference: PHYSICAL REVIEW A, VOL. 30 (1984), NO. 5, PP. 2568-2589.
Record Number: 1989123037600 / Last updated on: 1987-01-01
Available languages: en