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68. Laser Digital Cinema

Author

Takeuchi, Eric B., primary, Flint, Graham W., additional, Bergstedt, Robert, additional, Solone, Paul J., additional, Lee, Dicky, additional, and Moulton, Peter F., additional

Published
2001
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77. ARPA Solid State Laser and Nonlinear Materials Program.

Author

SCHWARTZ ELECTRO-OPTICS INC CONCORD MA RESEARCH DIV, Moulton, Peter F., SCHWARTZ ELECTRO-OPTICS INC CONCORD MA RESEARCH DIV, and Moulton, Peter F.

Abstract

The Research Division of Schwartz Electro-Optics, as part of the ARPA Solid State Laser and Nonlinear Materials Program, conducted a three-year study "Erbium-Laser-Based Infrared Sources." The aim of the study was to improve the understanding of semiconductor-laser-pumped, infrared (IR) solid state lasers based on the trivalent rare-earth ion erbium (Er) doped into a variety of host crystals. The initial program plan emphasized operation of erbium-doped materials on the 2.8-3.0 micrometers laser transition. Pulsed, Q-switched sources using that transition, when employed as a pump source for parametric oscillators, can provide tunable mid-IR energy. The dynamics of erbium lasers are more complex than conventional neodymium (Nd)-doped lasers and we intended to use pump-probe techniques to measure the level and temporal behavior of gain in various materials. To do so we constructed a number of different cw Er-doped lasers as probe sources and employed the Cr:LiSAF(LiSrAlF6) laser as a pulsed pump source that would simulate pulsed diode arrays. We identified the 970-nm wavelength pump band of Er as the most efficient and were able to make use of recently developed cw and pulsed InGaAs strained-quantum-well diode lasers in the effort. At the conclusion of the program we demonstrated the first pulsed diode bar pumping of the most promising materials for pulsed operation, the oxide garnets YSGG and GGG and the fluoride BaY2F8. (jg) p.1

Published
1994

80. Chromium Sensitized Garnets for Mid-IR Lasers

Author

SCHWARTZ ELECTRO-OPTICS INC CONCORD MA RESEARCH DIV, Moulton, Peter F., SCHWARTZ ELECTRO-OPTICS INC CONCORD MA RESEARCH DIV, and Moulton, Peter F.

Abstract

The characteristics of chromium-sensitized solid state lasers operating in the mid-infrared wavelength region have been studied. During the second year of research there was continued work on crystals doped with holmium and erbium, operating in the 2100-nm and 2800-nm regions. In addition, preliminary measurements were made on the laser performance of thulium around 2010 nm. For all these materials the effect of pump pulse length on output energy and overall efficiency has been measured. A flashlamp-pumped Cr,Nd:GSGG slab laser was operated and characterized at 1061 and 1310 nm. Measurements included comparison of normal mode slope efficiencies, input-output vs. pump pulse length, characterization of thermal lensing and measurement of Q-switched performance at 1061 nm. Spectroscopic properties of GGG crystals doped with Ce4+ ions were measured, including absorption and emission spectra and fluorescence lifetime. Keywords: Chromium sensitized solid state lasers, Mid infrared wavelength region.

Published
1990

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