Increase in velocimeter depth of focus through astigmatism

Journal Article · Wed Nov 01 00:00:00 EST 1995 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.1146117· OSTI ID:124856

Erskine, D J ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)

Frequently, velocimeter targets are illuminated by a laser beam passing through a hole in a mirror. This mirror is responsible for diverting returning light from a target lens to a velocity interferometer system for any reflector. This mirror is often a significant distance from the target lens. Consequently, at certain target focus positions the returning light is strongly vignetted by the hole, causing a loss of signal. This note finds that the loss of signal can be prevented and that the useful depth can be greatly increased by attaching a cylindrical lens to the target lens. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 124856
• Journal Information: Review of Scientific Instruments, Vol. 66, Issue 11; Other Information: PBD: Nov 1995
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
LASER TARGETS
VELOCITY
FOCUSING
GEOMETRICAL ABERRATIONS
LENSES
MIRRORS
VELOCIMETERS