Operating condition limitations of high density QCW arrays

Jeremy Junghans; Joseph Levy; Ryan Feeler

doi:10.1117/12.909097

8 February 2012 Operating condition limitations of high density QCW arrays

Jeremy Junghans, Joseph Levy, Ryan Feeler

Proceedings Volume 8241, High-Power Diode Laser Technology and Applications X; 82410E (2012) https://doi.org/10.1117/12.909097
Event: SPIE LASE, 2012, San Francisco, California, United States

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.

Citation Download Citation

Jeremy Junghans, Joseph Levy, and Ryan Feeler "Operating condition limitations of high density QCW arrays", Proc. SPIE 8241, High-Power Diode Laser Technology and Applications X, 82410E (8 February 2012); https://doi.org/10.1117/12.909097

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KEYWORDS

Diodes

Semiconductor lasers

Heatsinks

Laser cutting

Optoelectronics

Solid state lighting

Laser development

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