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Proceedings Paper

The Copper Vapor Laser A Novel Light Source For High-Speed Photography
Author(s): Robert E. Grove; W. B. Abrahams; A. Mallan
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Paper Abstract

Many of the limitations associated with conventional (incoherent) stroboscopic sources for high-speed photography can be overcome by the use of the copper laser for illumination. Properties of this short pulse, high-repetition-rate visible source are discussed and its use with a high-speed video camera described. Many of the limitations associated with conventional (incoherent) light sources for high-speed film or video recording can be overcome by the use of the copper vapor laser (CVL) for illumination. These limitations include: 1) mechanical shutter-speed constraints 2) limited repetition rate of strobes 3) relatively long pulse widths (4 microseconds) 4) proximity requirements of light source to subject 5) substantial target heat-loading These problems are reduced or eliminated by the use of the copper laser for illumination. The CVL is a pulsed, visible laser which has recently gained wide commercial acceptance as an efficient, rugged laser source for a variety of scientific and commercial applications. The laser produces pulses of 2-8 mJ in energy at a repetition rate of 4-6 kHz. The resulting total average power is 10-40 W at 510 nm and 578 nm. The laser's repetition rate exceeds by a factor of three to ten that of the fastest conventional strobe sources, allowing blur-free multiple images within a reasonable illumination field size. For example, a projectile traveling at 1500 m/s moves a distance of less than 50 microns during CVL illumination and only about 25 cm between pulses. Thus the copper laser can be used to measure not only projectile velocity but acceleration, spin rate and spin acceleration as well.

Paper Details

Date Published: 1 February 1985
PDF: 2 pages
Proc. SPIE 0491, 16th Intl Congress on High Speed Photography and Photonics, (1 February 1985); doi: 10.1117/12.967953
Show Author Affiliations
Robert E. Grove, Plasma Kinetics, Inc. (United States)
W. B. Abrahams, Eastman Kodak Company (United States)
A. Mallan, Eastman Kodak Company (United States)


Published in SPIE Proceedings Vol. 0491:
16th Intl Congress on High Speed Photography and Photonics
Michel L. Andre; Manfred Hugenschmidt, Editor(s)

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