| Workshop 2000 | SEKCE |
CTU, Faculty of Nuclear Sciences and Physical Engineering, Dept. of Physical Electronics
Břehová 7, 115 19 Praha 1
* Université Paris-Sud, LSAI
Bat. 350, 91405 Orsay, France
|
Lasing at short wavelengths in the EUV and soft X-ray regions of the spectrum is achieved in high-parameter plasmas. Temperatures of several hundred electronvolts are required.Large high-power infrared, visible or Uv lasers are generally employed to realize conditions for inverse population. To construct more efficient and compact sources of shortwave coherent radiation, several new approaches are proposed. This contribution reviews shortly some results in the area of of these new-generation EUV/X-ray lasing systems. Substatial part of the presented work has been carried out as a part of doctoral research of one of the authors (J.K.) in the framework of Czech-French agreement on common graduate study at the universities of these countries. Very important role in the development of this topic has played also Czech-Austrian cooperation supported by the program Aktion. The results of two various studies will be presented : (1) Transient Collisional Excitation (TCE)of Lasers Emitting in EUV/X Region: A survey of experimental research of double-pulse driven systems lasing effectively in the wavelength region < 20 nm. The work has been done by an international group (including A.K, J.K.) in French laboratories. To support these, and some planned experiments,a new code for the study of transient systems based on simplified Maxwell-Bloch equations has been developped. (2) Discharge-Driven and Hybride Lasing Systems (HLS) in EUV/X Region : Analysis of some topics related to the possibility tu use intense capillary discharges to generate short-wave coherent radiation and conceptual study of special - pseudocapillary - geometries of discharge systems and systems wirh additional excitation by powerfull subpicosecond lasers. The study was a part of the emerging research of potential discharge-drivem lasers at the FNSPE.
References[1] Klisnick,A. et al: Demonstration of Two-Color Transient Pumping in Ni-like Silver at 13.9 nm and 16.1 nm. New Progress in Application of X-Ray Lasers (Invited Paper). In: SPIE Conference on Soft X-Ray Lasers and Applications III, Denver,Colorado,July 1999. SPIE Vol. 3776, p. 282. (Co-author: Kuba J.)[2] Dr ka,L. : Pseudocapillary and Hybrid Lasing Systems. In: Seminar on Austrian-Czech Contributions to the Research of Lasers Pumped by Electrical Discharges, Prague, October 25, 1999. This research has been conducted in the framework of CTU project J04/98:210000022. |