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

D. M. Grasso; S. D. Roh; N. P. Ostrom; B. O. Faircloth

doi:10.1117/12.717937

10 May 2007 Fiber-coupled laser systems for high-power and high-brightness applications

D. M. Grasso, S. D. Roh, N. P. Ostrom, B. O. Faircloth

Proceedings Volume 6552, Laser Source Technology for Defense and Security III; 655211 (2007) https://doi.org/10.1117/12.717937
Event: Defense and Security Symposium, 2007, Orlando, Florida, United States

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.

Citation Download Citation

D. M. Grasso, S. D. Roh, N. P. Ostrom, and B. O. Faircloth "Fiber-coupled laser systems for high-power and high-brightness applications", Proc. SPIE 6552, Laser Source Technology for Defense and Security III, 655211 (10 May 2007); https://doi.org/10.1117/12.717937

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