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Proceedings Paper

Weight scaling model for high-power DPAL system
Author(s): Siva Mani; Douglas Rigdon; Kevin B. Hewett; David Hostutler
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Paper Abstract

Since Krupke proposed and demonstrated pumping alkali atoms using diode lasers in 2003, there has been lot of interest in the diode pumped alkali laser (DPAL) systems. Several researchers have been able to scale the DPAL system to powers in the tens of watts. We have conducted a systems-level, weight-scaling study of a notional medium power, CW DPAL system. Three different modes of operation are considered: (i) very high pressure operation (over 25 atmospheres of He) in which the absorption and emission lines of the alkali atoms are broadened sufficiently to allow for efficient pumping with off-the-shelf diodes that have line width of 2 to 3 nm, (ii) intermediate pressure regime (~ 5 atmospheres) that requires diodes that are line narrowed to ~0.4 nm, and (iii) low pressure operation (~ 1 atmosphere) that requires diodes that are line narrowed to < 0.1 nm for efficient pumping of pump radiation into the alkali vapor. In the latter two cases some amount of methane, ethane, or some other gas would be needed to mix the two upper states rapidly; while in the first case, helium is used to broaden the transition and to mix the upper states. We have considered closed-cycle transverse flowing systems with the transverse length limited by medium inhomogeneity caused by heat deposition into the gas. Weight models have been developed for each of the following sub-systems: Pump Diodes, Fluid Flow System, Thermal Management System, Optics and Diagnostics System, Instrumentation & Control System, and Electrical Power system. The results of our weight estimates for a notional 100 kW DPAL system are presented.

Paper Details

Date Published: 4 May 2010
PDF: 11 pages
Proc. SPIE 7686, Laser Technology for Defense and Security VI, 76860Y (4 May 2010); doi: 10.1117/12.850333
Show Author Affiliations
Siva Mani, Schafer Corp. (United States)
Douglas Rigdon, Schafer Corp. (United States)
Kevin B. Hewett, Air Force Research Lab. (United States)
David Hostutler, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 7686:
Laser Technology for Defense and Security VI
Mark Dubinskii; Stephen G. Post, Editor(s)

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