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Title: Optimizing the performance of nickel-like collisionally pumped x-ray lasers. II. Lasers for the wavelength range 50-100 A ring

Abstract

Soft x-ray lasers operating in the super- 100 A ring regime and using grazing incidence pumping methods are now established as efficient sources of radiation in this waveband. The concepts underlying this approach are to separate the ionization and excitation phases of the laser, and to match the pumping density of the latter to the optimal for gain generation. It is therefore of considerable interest to examine whether these ideas can be successfully applied to sub-100 A ring lasers. Three problems arise: first the adverse scaling of ionization with temperature for high atomic number ions, second the strong thermal conduction at these temperatures leads to a large hot zone upstream of the absorption, and third the optimum pumping density is greater than the critical density of 1 {mu}m wavelength, solid state pump lasers. Using analytic models and simulation we identify a strategy to overcome these problems using a pre-pulse of a mixed harmonic and fundamental radiation of Nd-glass laser radiation followed by the main pumping pulse of the fundamental normally incident. Due to the large upstream thermal zone and the high ionization temperature, we find that the energy required in the pre-pulse is much ({approx}3 times) larger than that inmore » the main, and that the energy needed consequently scales rapidly with the atomic number and therefore decreasing x-ray wavelength. Systems generating output energies of a few tens of {mu}J are examined at wavelengths between 50 and 70 A ring.« less

Authors:
 [1]
  1. Physics Department, University of York, Heslington, York, YO10 5DD (United Kingdom)
Publication Date:
OSTI Identifier:
20982184
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevA.75.023808; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ABSORPTION; ATOMIC NUMBER; DENSITY; EXCITATION; IONIZATION; LASER RADIATION; NICKEL; OPTICAL PUMPING; OPTIMIZATION; PERFORMANCE; PULSES; RING LASERS; SIMULATION; SOFT X RADIATION; SOLIDS; THERMAL CONDUCTION; WAVELENGTHS; X-RAY LASERS

Citation Formats

Pert, G. J. Optimizing the performance of nickel-like collisionally pumped x-ray lasers. II. Lasers for the wavelength range 50-100 A ring. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.023808.
Pert, G. J. Optimizing the performance of nickel-like collisionally pumped x-ray lasers. II. Lasers for the wavelength range 50-100 A ring. United States. doi:10.1103/PHYSREVA.75.023808.
Pert, G. J. Thu . "Optimizing the performance of nickel-like collisionally pumped x-ray lasers. II. Lasers for the wavelength range 50-100 A ring". United States. doi:10.1103/PHYSREVA.75.023808.
@article{osti_20982184,
title = {Optimizing the performance of nickel-like collisionally pumped x-ray lasers. II. Lasers for the wavelength range 50-100 A ring},
author = {Pert, G. J.},
abstractNote = {Soft x-ray lasers operating in the super- 100 A ring regime and using grazing incidence pumping methods are now established as efficient sources of radiation in this waveband. The concepts underlying this approach are to separate the ionization and excitation phases of the laser, and to match the pumping density of the latter to the optimal for gain generation. It is therefore of considerable interest to examine whether these ideas can be successfully applied to sub-100 A ring lasers. Three problems arise: first the adverse scaling of ionization with temperature for high atomic number ions, second the strong thermal conduction at these temperatures leads to a large hot zone upstream of the absorption, and third the optimum pumping density is greater than the critical density of 1 {mu}m wavelength, solid state pump lasers. Using analytic models and simulation we identify a strategy to overcome these problems using a pre-pulse of a mixed harmonic and fundamental radiation of Nd-glass laser radiation followed by the main pumping pulse of the fundamental normally incident. Due to the large upstream thermal zone and the high ionization temperature, we find that the energy required in the pre-pulse is much ({approx}3 times) larger than that in the main, and that the energy needed consequently scales rapidly with the atomic number and therefore decreasing x-ray wavelength. Systems generating output energies of a few tens of {mu}J are examined at wavelengths between 50 and 70 A ring.},
doi = {10.1103/PHYSREVA.75.023808},
journal = {Physical Review. A},
number = 2,
volume = 75,
place = {United States},
year = {Thu Feb 15 00:00:00 EST 2007},
month = {Thu Feb 15 00:00:00 EST 2007}
}