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Title: Power balancing the multibeam OMEGA laser

Abstract

Multibeam lasers often require an output beam balance that specifies the degree of simultaneity of laser output energy, instantaneous power, or instantaneous irradiance (power per unit area). In this work the general problem of balancing a multibeam laser is described. Specific techniques used to balance the output power of the 60-beam pulsed OMEGA Laser System are discussed along with a measured reduction of beam-to-beam imbalance. In particular, the square-pulse distortion induced by a simple saturating amplifier operating with its output at some fraction of its saturation fluence is derived, and a novel method of exchanging gain between saturated amplifiers in a single beam that have different saturation fluences to adjust balance is described.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1485416
Alternate Identifier(s):
OSTI ID: 1480557
Report Number(s):
2018-169, 1452
Journal ID: ISSN 1559-128X; APOPAI
Grant/Contract Number:  
NA0001944
Resource Type:
Accepted Manuscript
Journal Name:
Applied Optics
Additional Journal Information:
Journal Volume: 57; Journal Issue: 32; Journal ID: ISSN 1559-128X
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY

Citation Formats

Sampat, S., Kosc, T. Z., Bauer, K. A., Dean, R. D., Donaldson, W. R., Kwiatkowski, J., Moshier, R., Rigatti, A. L., Romanofsky, M. H., Waxer, L. J., and Kelly, J. H. Power balancing the multibeam OMEGA laser. United States: N. p., 2018. Web. doi:10.1364/AO.57.009571.
Sampat, S., Kosc, T. Z., Bauer, K. A., Dean, R. D., Donaldson, W. R., Kwiatkowski, J., Moshier, R., Rigatti, A. L., Romanofsky, M. H., Waxer, L. J., & Kelly, J. H. Power balancing the multibeam OMEGA laser. United States. doi:10.1364/AO.57.009571.
Sampat, S., Kosc, T. Z., Bauer, K. A., Dean, R. D., Donaldson, W. R., Kwiatkowski, J., Moshier, R., Rigatti, A. L., Romanofsky, M. H., Waxer, L. J., and Kelly, J. H. Mon . "Power balancing the multibeam OMEGA laser". United States. doi:10.1364/AO.57.009571. https://www.osti.gov/servlets/purl/1485416.
@article{osti_1485416,
title = {Power balancing the multibeam OMEGA laser},
author = {Sampat, S. and Kosc, T. Z. and Bauer, K. A. and Dean, R. D. and Donaldson, W. R. and Kwiatkowski, J. and Moshier, R. and Rigatti, A. L. and Romanofsky, M. H. and Waxer, L. J. and Kelly, J. H.},
abstractNote = {Multibeam lasers often require an output beam balance that specifies the degree of simultaneity of laser output energy, instantaneous power, or instantaneous irradiance (power per unit area). In this work the general problem of balancing a multibeam laser is described. Specific techniques used to balance the output power of the 60-beam pulsed OMEGA Laser System are discussed along with a measured reduction of beam-to-beam imbalance. In particular, the square-pulse distortion induced by a simple saturating amplifier operating with its output at some fraction of its saturation fluence is derived, and a novel method of exchanging gain between saturated amplifiers in a single beam that have different saturation fluences to adjust balance is described.},
doi = {10.1364/AO.57.009571},
journal = {Applied Optics},
number = 32,
volume = 57,
place = {United States},
year = {2018},
month = {1}
}

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Cited by: 4 works
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Figures / Tables:

Fig. 1. Fig. 1.: (a) A typical cryogenic target implosion pulse shape shot on OMEGA containing three pickets followed by a drive. (b) The depicted pulse shape has an energy imbalance of 3.5% rms across 60 beams; the picket and the drive have a power imbalance of 2.5% rms and, 3.5% rms,more » respectively.« less

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