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Title: Pump pulse-width dependence of grazing-incidence pumped transient collisional soft-x-ray lasers

Abstract

The output energy dependence of high repetition rate grazing incidence pumped Ni-like Mo, Ni-like Ag, and Ne-like Ti transient collisional soft x-ray lasers on the duration of the pump pulse was studied combining experiments and model simulations. Lasing is observed to occur for a wide range of pump pulse widths (e.g., 2 to 18 ps for Ni-like Ag), with maximum output occurring for pump pulses of 4-6 ps FWHM, corresponding to pump intensities of 1.4-2.0x10{sup 14} W/cm{sup 2}. Moderately short pump pulses are observed to be optimum for lasers that make use of preplasmas in which the mean degree of ionization approaches the charge of the lasing ion, while long pump pulses produce over-ionization and weaker lasing. However, long pump pulses are capable of producing gain and lasing in low Z ions even when the preplasma has a very low degree of ionization after expanding for 5 ns. As the duration of the pump pulse shortens the optimum delay respect to the prepulse is observed to decrease. The physics that determines these and other measured trends is discussed.

Authors:
; ; ; ;  [1];  [2]
  1. NSF ERC for Extreme Ultraviolet Science and Technology, and Electrical and Computer Engineering Department, Colorado State University, Fort Collins, Colorado 80523 (United States)
  2. Department of Applied Science, University of California Davis--Livermore, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
21000537
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 75; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevA.75.063821; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ENERGY DEPENDENCE; IONIZATION; IONS; MOLYBDENUM; OPTICAL PUMPING; PHOTON-ATOM COLLISIONS; PLASMA PRODUCTION; PULSES; SILVER; SIMULATION; SOFT X RADIATION; TITANIUM; TRANSIENTS; X-RAY LASERS

Citation Formats

Berrill, M, Wang, Y, Larotonda, M A, Luther, B M, Rocca, J J, and Shlyaptsev, V N. Pump pulse-width dependence of grazing-incidence pumped transient collisional soft-x-ray lasers. United States: N. p., 2007. Web. doi:10.1103/PHYSREVA.75.063821.
Berrill, M, Wang, Y, Larotonda, M A, Luther, B M, Rocca, J J, & Shlyaptsev, V N. Pump pulse-width dependence of grazing-incidence pumped transient collisional soft-x-ray lasers. United States. https://doi.org/10.1103/PHYSREVA.75.063821
Berrill, M, Wang, Y, Larotonda, M A, Luther, B M, Rocca, J J, and Shlyaptsev, V N. 2007. "Pump pulse-width dependence of grazing-incidence pumped transient collisional soft-x-ray lasers". United States. https://doi.org/10.1103/PHYSREVA.75.063821.
@article{osti_21000537,
title = {Pump pulse-width dependence of grazing-incidence pumped transient collisional soft-x-ray lasers},
author = {Berrill, M and Wang, Y and Larotonda, M A and Luther, B M and Rocca, J J and Shlyaptsev, V N},
abstractNote = {The output energy dependence of high repetition rate grazing incidence pumped Ni-like Mo, Ni-like Ag, and Ne-like Ti transient collisional soft x-ray lasers on the duration of the pump pulse was studied combining experiments and model simulations. Lasing is observed to occur for a wide range of pump pulse widths (e.g., 2 to 18 ps for Ni-like Ag), with maximum output occurring for pump pulses of 4-6 ps FWHM, corresponding to pump intensities of 1.4-2.0x10{sup 14} W/cm{sup 2}. Moderately short pump pulses are observed to be optimum for lasers that make use of preplasmas in which the mean degree of ionization approaches the charge of the lasing ion, while long pump pulses produce over-ionization and weaker lasing. However, long pump pulses are capable of producing gain and lasing in low Z ions even when the preplasma has a very low degree of ionization after expanding for 5 ns. As the duration of the pump pulse shortens the optimum delay respect to the prepulse is observed to decrease. The physics that determines these and other measured trends is discussed.},
doi = {10.1103/PHYSREVA.75.063821},
url = {https://www.osti.gov/biblio/21000537}, journal = {Physical Review. A},
issn = {1050-2947},
number = 6,
volume = 75,
place = {United States},
year = {Fri Jun 15 00:00:00 EDT 2007},
month = {Fri Jun 15 00:00:00 EDT 2007}
}