SHORT-WAVELENGTH LASING ON COLLISIONALLY PUMPED, HIGHLY EXCITED 2S HOLE STATES OF NEON-LIKE IONS IN PREFORMED PLASMAS, IRRADIATED WITH INTENSE PICOSECOND PULSES

Citation
Sb. Healy et al., SHORT-WAVELENGTH LASING ON COLLISIONALLY PUMPED, HIGHLY EXCITED 2S HOLE STATES OF NEON-LIKE IONS IN PREFORMED PLASMAS, IRRADIATED WITH INTENSE PICOSECOND PULSES, Optics communications, 144(1-3), 1997, pp. 24-30
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Optics
Journal title
ISSN journal
0030-4018
Volume
144
Issue
1-3
Year of publication
1997
Pages
24 - 30
Database
ISI
SICI code
0030-4018(1997)144:1-3<24:SLOCPH>2.0.ZU;2-6
Abstract
Simulations of preformed germanium and yttrium plasmas irradiated with intense greater than or equal to 10(15) W cm(-2) picosecond pulses ar e presented. The results indicate that the combination of high electro n temperature (similar to 2 keV) at electron densities of greater than or equal to 10(21) cm(-3) can lead to lasing on 2s hole transitions a t wavelengths of 62 Angstrom and 42 Angstrom for the germanium and ytt rium respectively. In both cases, the small signal gain is considerabl y smaller than that predicted for the mon usual 2p hole transitions be cause it is limited by the large Doppler linewidths associated with th e shorter wavelengths, However, the wavelength also leads to improved sampling of the gain regions as refraction effects are reduced. The fa r field patterns are characterised by deflected angles of similar to 5 mrad with narrow horizontal and vertical divergence. In addition, it is shown that the output intensity can be enhanced by using curved tar gets for lengths of similar to 2 cm. (C) 1997 Elsevier Science B.V.