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Proceedings Paper

Fiber-coupled laser systems for high-power and high-brightness applications
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Paper Abstract

Fiber-coupled systems based on broad-area multimode emitters require complicated optical trains in order to transform their poor quality output beam into a usable form. Recently, Nuvonyx has reported implementations of a single spatial mode, high-brightness laser diode bar with significantly improved beam quality. These laser bars represent a broad technology platform at the core of many Nuvonyx systems. The low output divergence of these devices enables efficient coupling into a 400 &mgr;m core, 0.22 numerical aperture fiber with a single focusing lens. Larger systems using stacks of high-brightness diode laser bars can achieve greater than 1.7 kW output from this same fiber size, corresponding to a power density level exceeding 1.4 MW/cm2. The high-brightness bars reported here are compatible with techniques for achieving high spatial or spectral brightness. Using external feedback elements such as a volume Bragg grating, the output spectrum can be narrowed to less than 0.25 nm and is stabilized to dλ/dI = 4 pm/A and dλ/dT = 2 pm/°C. Using spectral beam combination, a single high brightness bar can be coupled into a 100 &mgr;m core, 0.22 NA fiber with approximately 90% efficiency.

Paper Details

Date Published: 10 May 2007
PDF: 6 pages
Proc. SPIE 6552, Laser Source Technology for Defense and Security III, 655211 (10 May 2007); doi: 10.1117/12.717937
Show Author Affiliations
D. M. Grasso, Nuvonyx, Inc. (United States)
S. D. Roh, Nuvonyx, Inc. (United States)
N. P. Ostrom, Nuvonyx, Inc. (United States)
B. O. Faircloth, Nuvonyx, Inc. (United States)

Published in SPIE Proceedings Vol. 6552:
Laser Source Technology for Defense and Security III
Gary L. Wood; Mark A. Dubinskii, Editor(s)

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