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Enhanced vacuum laser-impulse coupling by volume absorption at infrared wavelengths

Published online by Cambridge University Press:  09 March 2009

C. R. Phipps Jr ,
R. F. Harrison ,
T. Shimada ,
G. W. York ,
T. P. Turner ,
X. F. Corlis ,
H. S. Steele ,
L. C. Haynes  and
T. R. King
C. R. Phipps Jr
Affiliation:
Los Alamos National Laboratory, Chemical and Laser Sciences Division, Mail Stop E543, Los Alamos, New Mexico 87545
R. F. Harrison
Affiliation:
Los Alamos National Laboratory, Chemical and Laser Sciences Division, Mail Stop E543, Los Alamos, New Mexico 87545
T. Shimada
Affiliation:
Los Alamos National Laboratory, Chemical and Laser Sciences Division, Mail Stop E543, Los Alamos, New Mexico 87545
G. W. York
Affiliation:
Los Alamos National Laboratory, Chemical and Laser Sciences Division, Mail Stop E543, Los Alamos, New Mexico 87545
T. P. Turner
Affiliation:
Los Alamos National Laboratory, Chemical and Laser Sciences Division, Mail Stop E543, Los Alamos, New Mexico 87545
X. F. Corlis
Affiliation:
Los Alamos National Laboratory, Chemical and Laser Sciences Division, Mail Stop E543, Los Alamos, New Mexico 87545
H. S. Steele
Affiliation:
Los Alamos National Laboratory, Chemical and Laser Sciences Division, Mail Stop E543, Los Alamos, New Mexico 87545
L. C. Haynes
Affiliation:
Los Alamos National Laboratory, Chemical and Laser Sciences Division, Mail Stop E543, Los Alamos, New Mexico 87545
T. R. King
Affiliation:
Boeing Aerospace Company, Physical Sciences Research Center, Mail Stop 2R-00, P.O. Box 3999, Seattle, WA 98124
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Abstract

We report measurements of vacuum laser impulse coupling coefficients as large as 90 dyne/W, obtained with single μs-duration CO2 laser pulses incident on a volume-absorbing, cellulose-nitrate-based plastic. This result is the largest coupling coefficient yet reported at any wavelength for a simple, planar target in vacuum, and partly results from expenditure of internal chemical energy in this material. Enhanced coupling was also observed in several other target materials that are chemically passive, but absorb light in depth at 10-μm and 3-μm wavelengths. We discuss the physical distinctions between this important case and that of simple, planar surface absorbers [such as metals] which were studied in the same experimental series, in light of the predictions of a simple theoretical model. Ablation parameters for use with the model were determined in separate experiments near threshold in air and in vacuum. The transition from volume- to surface-absorption behavior in the infrared is described as being controlled by fluence-limiting and wavelength conversion in the uppermost target layer.

Type
Research Article
Information
Laser and Particle Beams , Volume 8 , Issue 1-2 , January 1990 , pp. 281 - 298
Copyright
Copyright © Cambridge University Press 1990

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