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Proceedings Paper

Photographic Applications Of Pulsed Semiconductor Lasers
Author(s): Lee A. Cross
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Paper Abstract

The recent development of photographic illuminators using high-power pulsed semiconductor lasers as light sources has demonstrated their attractiveness for this purpose. The small size of these lasers and their modest power requirements permits very compact multiple-source illuminators and cameras to be assembled. Single-image, multiple-exposure and 20-image Cranz-Schardin cameras using film as the recording medium will be described. An orthogonal stereo single-image camera is also described. Although the average power output power of a semiconductor laser is low, they can be employed in applications requiring high average powers for a short time. In back-lit camera systems, framing rates above 2 MHz can be supported. In such an application, experience has shown that duty factors more than 1000 times higher than the normal rating can be obtained without permanent damage to the laser. The effective emitting area of a semiconductor laser is typically a fraction of a millimeter on a side, but the real source actually consists of a set of chip faces arranged in parallel rows. The emitting area of each chip is much longer than it is wide; the typical width being less than ten microns. Care must be exercised in the design of an optical system to avoid having this structure appear on the image.

Paper Details

Date Published: 1 February 1989
PDF: 9 pages
Proc. SPIE 0981, High Speed Photography, Videography, and Photonics VI, (1 February 1989); doi: 10.1117/12.948684
Show Author Affiliations
Lee A. Cross, Special Illumination Systems, Inc (United States)

Published in SPIE Proceedings Vol. 0981:
High Speed Photography, Videography, and Photonics VI
Gary L. Stradling, Editor(s)

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