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Proceedings Paper

Spectral beam combining of diode laser bars to achieve efficient near diffraction limited output power
Author(s): Steven Chase Tidwell; Steve Roman; Don Jander; Dennis D. Lowenthal
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Paper Abstract

The use of diode laser bars has traditionally been limited in many applications because of their poor beam quality in the plane of the junction (slow direction). Spectral Beam Combination (SBC) corrects this defect with minimal impact on efficiency. Aculight has demonstrated efficient SBC of nearly 400 single transverse mode semiconductor lasers. The semiconductor lasers were packaged in two adjacent 1-cm wide, 200 emitter bars. The M2 of a single 1-cm wide diode bar is typically greater than 1000. Using SBC we have measured an output M2 of less than 1.5. The output bandwidth of the device is ~10 nm; and it is this spectral width that allows combination with the result that each of the 200 lasers deliver power through the same output aperture. The efficiency of this process was measured at >70% when high quality optical components were employed. Efficiency is defined as the SBC output power normalized to the power provided by the diode bars without SBC. With single emitters we have achieved SBC efficiencies of >80%.

Paper Details

Date Published: 19 June 2003
PDF: 5 pages
Proc. SPIE 4973, High-Power Diode Laser Technology and Applications, (19 June 2003); doi: 10.1117/12.478375
Show Author Affiliations
Steven Chase Tidwell, Aculight Corp. (United States)
Steve Roman, Aculight Corp. (United States)
Don Jander, Aculight Corp. (United States)
Dennis D. Lowenthal, Aculight Corp. (United States)

Published in SPIE Proceedings Vol. 4973:
High-Power Diode Laser Technology and Applications
Mark S. Zediker, Editor(s)

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