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Title: High Repetition Rate Table-Top Soft X-Ray Lasers in Capillary Discharges and Laser-Created Plasmas

Abstract

We discuss very recent advances in high repetition rate soft x-ray lasers resulting from the use of two different types of hot dense plasmas: fast capillary discharges and laser-created plasmas. We have demonstrated a new high repetition rate 46.9 nm capillary discharge laser that fits onto the surface area of a small desk and that operates at a relatively low voltage, therefore not requiring a Marx generator. Laser pulses with an energy of {approx} 13 {mu}J are generated at repetition rates up to 12 Hz. About (2-3)x104 laser shots can be generated with a single capillary. This new type of portable laser is an easily accessible source of intense short wavelength laser light for applications. We also discuss the demonstration of 5 Hz repetition rate table-top soft x-ray lasers producing microwatt average powers at wavelengths ranging from 13.2 to 33 nm. The results were obtained by collisional electron excitation of Ni-like and Ne-like ions in plasmas efficiently heated with a picosecond optical laser pulse impinging at grazing incidence onto a pre-created plasma. Efficient deposition of the pump beam into the gain region allows for the excitation of soft x-ray lasers in this wavelength range with a short pulse pump energymore » of only 1 J.« less

Authors:
; ; ; ; ; ; ; ;  [1];  [2];  [3]
  1. NSF ERC for Extreme Ultraviolet Science and Technology, Colorado State University (United States)
  2. (United States)
  3. Department of Applied Science, University of California Davis-Livermore, Livermore, CA 94551 (United States)
Publication Date:
OSTI Identifier:
20729259
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 808; Journal Issue: 1; Conference: 6. international conference on dense Z-pinches, Oxford (United Kingdom), 25-28 Jul 2005; Other Information: DOI: 10.1063/1.2159362; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CAPILLARIES; DEPOSITION; ELECTRIC POTENTIAL; ELECTRON COLLISIONS; ELECTRONS; EXCITATION; GAIN; ION COLLISIONS; IONS; MARX GENERATORS; PLASMA; PLASMA HEATING; PLASMA PRODUCTION; PULSES; SOFT X RADIATION; SURFACE AREA; VISIBLE RADIATION; WAVELENGTHS; X-RAY LASERS

Citation Formats

Rocca, J.J., Luther, B.M., Heinbuch, S., Larotonda, M.A., Wang, Y., Alessi, D., Berrill, M., Marconi, M.C., Menoni, C.S., Electrical and Computer Engineering Department, Colorado State University, and Shlyaptsev, V.N. High Repetition Rate Table-Top Soft X-Ray Lasers in Capillary Discharges and Laser-Created Plasmas. United States: N. p., 2006. Web. doi:10.1063/1.2159362.
Rocca, J.J., Luther, B.M., Heinbuch, S., Larotonda, M.A., Wang, Y., Alessi, D., Berrill, M., Marconi, M.C., Menoni, C.S., Electrical and Computer Engineering Department, Colorado State University, & Shlyaptsev, V.N. High Repetition Rate Table-Top Soft X-Ray Lasers in Capillary Discharges and Laser-Created Plasmas. United States. doi:10.1063/1.2159362.
Rocca, J.J., Luther, B.M., Heinbuch, S., Larotonda, M.A., Wang, Y., Alessi, D., Berrill, M., Marconi, M.C., Menoni, C.S., Electrical and Computer Engineering Department, Colorado State University, and Shlyaptsev, V.N. Thu . "High Repetition Rate Table-Top Soft X-Ray Lasers in Capillary Discharges and Laser-Created Plasmas". United States. doi:10.1063/1.2159362.
@article{osti_20729259,
title = {High Repetition Rate Table-Top Soft X-Ray Lasers in Capillary Discharges and Laser-Created Plasmas},
author = {Rocca, J.J. and Luther, B.M. and Heinbuch, S. and Larotonda, M.A. and Wang, Y. and Alessi, D. and Berrill, M. and Marconi, M.C. and Menoni, C.S. and Electrical and Computer Engineering Department, Colorado State University and Shlyaptsev, V.N.},
abstractNote = {We discuss very recent advances in high repetition rate soft x-ray lasers resulting from the use of two different types of hot dense plasmas: fast capillary discharges and laser-created plasmas. We have demonstrated a new high repetition rate 46.9 nm capillary discharge laser that fits onto the surface area of a small desk and that operates at a relatively low voltage, therefore not requiring a Marx generator. Laser pulses with an energy of {approx} 13 {mu}J are generated at repetition rates up to 12 Hz. About (2-3)x104 laser shots can be generated with a single capillary. This new type of portable laser is an easily accessible source of intense short wavelength laser light for applications. We also discuss the demonstration of 5 Hz repetition rate table-top soft x-ray lasers producing microwatt average powers at wavelengths ranging from 13.2 to 33 nm. The results were obtained by collisional electron excitation of Ni-like and Ne-like ions in plasmas efficiently heated with a picosecond optical laser pulse impinging at grazing incidence onto a pre-created plasma. Efficient deposition of the pump beam into the gain region allows for the excitation of soft x-ray lasers in this wavelength range with a short pulse pump energy of only 1 J.},
doi = {10.1063/1.2159362},
journal = {AIP Conference Proceedings},
number = 1,
volume = 808,
place = {United States},
year = {Thu Jan 05 00:00:00 EST 2006},
month = {Thu Jan 05 00:00:00 EST 2006}
}
  • We discuss recent advances in high repetition rate table-top soft x-ray lasers that allow the generation of laser beams in the 25-100 eV photon energy region with peak spectral brightness that surpasses by several orders of magnitude that of undulators in third generation synchrotrons, enabling new applications. These advances include the demonstration of 5 Hz repetition rate table-top soft x-ray lasers that operate in the gain-saturation regime to produce intense beams at wavelengths ranging from 13.2 to 32.6 nm, and the observation of lasing at wavelengths down to 10.9 nm. The results were obtained by collisional electron impact excitation ofmore » highly ionized atoms in dense plasmas efficiently heated with picosecond optical laser pulses of only 1 J energy. Further improvement in the brightness of these compact sources was obtained seeding the soft x-ray amplifiers with high harmonic pulses. We have demonstrated the saturated amplification of high harmonic seed pulses in a dense transient collisional soft x-ray laser amplifier medium created by heating a solid titanium target. Amplification of the seed pulses in the 32.6 nm line of Ne-like Ti generated laser pulses of sub-picosecond duration that were measured to approach full spatial coherence. The scheme is scalable to produce extremely bright lasers at very short wavelength with full temporal and spatial coherence. These new compact lasers are allowing the implementation of a variety of table-top experiments with intense soft x-ray laser light.« less
  • Compact =13.9 nm and =18.9 nm lasers with >0.1 mW average power at 100 Hz repetition rate driven by a diode-pumped, 1 J, CPA laser were demonstrated. Wavelength scaling to =10.9 nm will be discussed.
  • No abstract available.
  • A sequence of high resolution shadowgrams that map the evolution of the plasma of a 380 {micro}m diameter microcapillary discharge was obtained using a very compact 46.9 nm laser. These images are the first plasma diagnostics data obtained using a table-top soft X-ray laser.
  • We have performed systematic measurements and numerical modeling of the divergence and exit beam size of a 46.9 nm Ne-like Ar capillary discharge pumped soft-x-ray amplifier. Two-dimensional near-field and far-field measurements were obtained over a wide range of discharge parameters. The spot size and divergence of the laser beam were observed to increase significantly with decreasing discharge pressure. Simultaneously, the beam intensity distribution changed from a single peak pattern to an annular profile. These effects are shown to be the result of increased refraction of the soft-x-ray beam, caused by larger density gradients in the plasma columns of the lowermore » pressure discharges. The spatial images are nearly cylindrically symmetric, and have less structure than those reported in the literature for laser-driven soft-x-ray lasers. Beam profiles synthesized by model calculations are found to be in good agreement with the recorded images. The obtained images in combination with the model computations clarify the origin of the different beam patterns that are observed in capillary discharge soft-x-ray laser experiments. {copyright} {ital 1998} {ital The American Physical Society}« less