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Proceedings Paper

Diode-pumped vanadate lasers for variable-resolution video projectors
Author(s): Robert J. Martinsen; Masayuki Karakawa; Stephen R. McDowell; Keith W. Kennedy; Andrew J. Radl
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Paper Abstract

Laser diodes are an important optical pump source for achieving high luminous efficiencies (i.e., total projected lumens per watt of input power) for laser video projectors. The commercial viability of these projectors will rely on extremely stable, diode-pumped near infrared lasers and high- quality nonlinear crystals to generate the required powers of red, green and blue light. Since pulsed lasers achieve the high peak powers that lead to efficient nonlinear interactions, there is a compelling argument for projectors to use pulsed rather than cw infrared lasers to create the RGB primaries. A method of spatial light modulation compatible with pulsed light sources is acousto-optic line writing, by which the modulation for an entire row of pixels (i.e., line of video) is captured by a single pulse of light. This modulation scheme, however, requires that the laser(s) produce short pulses at high rep rate to display the full resolution of the input video signal. Diode-pumped Nd:YVO4 lasers are well suited for variable resolution projectors for their ability to deliver short pulses (less than 20 ns) over a wide range of rep rates (up to 90 kHz). We describe in this paper how pulsed Nd:YVO4 lasers and AO modulators, enable variable resolution laser projectors that can display 2xNTSC, 4xNTSC, VGA, SVGA, XGA, and SXGA video formats.

Paper Details

Date Published: 4 May 1998
PDF: 9 pages
Proc. SPIE 3285, Fabrication, Testing, Reliability, and Applications of Semiconductor Lasers III, (4 May 1998); doi: 10.1117/12.307600
Show Author Affiliations
Robert J. Martinsen, Corp. for Laser Optics Research (United States)
Masayuki Karakawa, Corp. for Laser Optics Research (United States)
Stephen R. McDowell, Corp. for Laser Optics Research (United States)
Keith W. Kennedy, Corp. for Laser Optics Research (United States)
Andrew J. Radl, Corp. for Laser Optics Research (United States)


Published in SPIE Proceedings Vol. 3285:
Fabrication, Testing, Reliability, and Applications of Semiconductor Lasers III
Kurt J. Linden; Mahmoud Fallahi; Kurt J. Linden; S. C. Wang, Editor(s)

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