Time-Dependent X-Ray Reflectivity of a Germanium Crystal Heated with 25 ps 1.06 µm Laser Light

C. J. Hailey; G. Busch; R. Johnson; Z. Koenig; J. Lupton; R. Schroeder; D. Sullivan; W. Goldstein

doi:10.1117/12.936593

12 August 1986 Time-Dependent X-Ray Reflectivity of a Germanium Crystal Heated with 25 ps 1.06 µm Laser Light

C. J. Hailey, G. Busch, R. Johnson, Z. Koenig, J. Lupton, R. Schroeder, D. Sullivan, W. Goldstein

Proceedings Volume 0690, X-Rays in Materials Analysis: Novel Applications and Recent Developments; (1986) https://doi.org/10.1117/12.936593
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

Abstract

Preliminary experimental and theoretical studies have been undertaken of the time dependent x-ray reflectivity of a germanium crystal under pulsed laser illumination. The integrated x-ray reflectivity is used as a temperature probe of the crystal. The Chroma laser system at KMS Fusion provided a 1.054 μm (IR) heating pulse with a 25 ps (FWHM) width. Fluences on the germanium (333) crystal varied from 0 to 2 Vcm2. The germanium crystal was simultaneously irradiated with high intensity x-rays from a laser plasma. The emitting plasma was formed by directing a high energy, 0.527 μm laser at a manganese target. The time history of the x-rays reflected from the crystal was detected by an x-ray streak camera. A computer code was written which models temperature dependent dynamical x-ray diffraction. The code takes into account the heating beam absorption profile, depth-dependent Debye-Waller effect and thermal strain profile. The present setup is sensitive to reflectivity changes of 20%. With some improvements, the technique appears to have some promise for real-time studies of crystal behavior.

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C. J. Hailey, G. Busch, R. Johnson, Z. Koenig, J. Lupton, R. Schroeder, D. Sullivan, and W. Goldstein "Time-Dependent X-Ray Reflectivity of a Germanium Crystal Heated with 25 ps 1.06 µm Laser Light", Proc. SPIE 0690, X-Rays in Materials Analysis: Novel Applications and Recent Developments, (12 August 1986); https://doi.org/10.1117/12.936593

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