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Proceedings Paper

Operating condition limitations of high density QCW arrays
Author(s): Jeremy Junghans; Joseph Levy; Ryan Feeler
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Paper Abstract

Northrop Grumman Cutting Edge Optronics (NGCEO) has developed a laser diode array package with minimal bar-tobar spacing. These High Density Stack (HDS) packages allow for a power density increase on the order of ~ 2.5x when compared to industry-standard arrays. Power densities as high as 15 kW/cm2 can be achieved when operated at 200 W/bar. This work provides a detailed description of the duty factor, pulse width and power limitations of high density arrays. The absence of the interposing heatsinks requires that all of the heat generated by the interior bars must travel through the adjacent bars to the electrical contacts. This results in limitations to the allowable operating envelope of the HDS arrays. Thermal effects such as wavelength shifts across large HDS arrays are discussed. An overview of recent HDS design and manufacturing improvements is also presented. These improvements result in reliable operation at higher power densities and increased duty factors. A comparison of the effect of bar geometry on HDS performance is provided. Test data from arrays featuring these improvements based on both full 1 cm wide diode bars as well as 3 mm wide mini-bars is also presented.

Paper Details

Date Published: 8 February 2012
PDF: 8 pages
Proc. SPIE 8241, High-Power Diode Laser Technology and Applications X, 82410E (8 February 2012); doi: 10.1117/12.909097
Show Author Affiliations
Jeremy Junghans, Northrop Grumman Cutting Edge Optronics (United States)
Joseph Levy, Northrop Grumman Cutting Edge Optronics (United States)
Ryan Feeler, Northrop Grumman Cutting Edge Optronics (United States)

Published in SPIE Proceedings Vol. 8241:
High-Power Diode Laser Technology and Applications X
Mark S. Zediker, Editor(s)

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