Conversion of laser light into soft X-rays with 3-ns and 30-ps laser pulses
The X-ray emission from planar targets made of aluminium, copper, or gold irradiated by a frequency-doubled Nd laser (530 nm wavelength and 1.0 E12 to 1.0 E14 W/cm2 laser intensity) was measured at two pulse durations: 3 ns and 30 ps. The X-ray emission was measured absolutely with spectral, temporal, and spatial resolution in the wavelength range 3 to 250 Angstroms by using filtered bolometers, a transmission grating spectrometer, X-ray diodes, and an X-ray streak camera as diagnostics. In addition, the absorption of laser light was measured. For the short, 30 ps laser pulse the conversion of incident laser energy into X-rays was considerably less than that with the long, 3 ns pulse. This is caused by less absorption of laser light and, in addition, by less conversion of absorbed laser energy into X-rays in the case of the short pulse. The results are compared with numerical simulations performed with the MULTI hydrocode.
Bibliographic Reference: Article: Laser and Particle Beams, Vol. 9 (1991) No. 2, pp. 551-562
Record Number: 199111412 / Last updated on: 1994-12-02
Original language: en
Available languages: en