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Proceedings Paper

Spectral beam combining of thulium fiber laser systems
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Paper Abstract

Beams from three frequency stabilized master oscillator power amplifier (MOPA) thulium fiber laser systems were spectrally beam combined using a metal diffraction grating. Two of the laser oscillators were stabilized with guided mode resonances filters while the third was stabilized using a gold-coated diffraction grating. Each system was capable of producing a minimum of 40 W output powers with slope efficiencies between 50-60 %. The three lasers undergoing combination were operating at wavelengths of 1984.3, 2002.1, and 2011.9 nm with spectral linewidths between 250-400 pm. Beam combining was accomplished by spatially overlapping the spectrally separated beams on a water-cooled gold-coated diffraction grating with 600 lines/mm. Beam quality measurements were completed using M2 measurements at multiple power levels of the combined beam. Power levels of 49 W were achieved before thermal heating of the metal diffraction grating cause degradation in beam quality. The combining grating was ~66% efficient for the unpolarized light corresponding to a total optical-to-optical efficiency of 33% with respect to launched pump power.

Paper Details

Date Published: 17 February 2010
PDF: 6 pages
Proc. SPIE 7580, Fiber Lasers VII: Technology, Systems, and Applications, 75801Q (17 February 2010); doi: 10.1117/12.842500
Show Author Affiliations
R. Andrew Sims, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Christina C. C. Willis, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Pankaj Kadwani, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Timothy S. McComb, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Northrop Grumman (United States)
Lawrence Shah, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Vikas Sudesh, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Quantum Tech Inc. (United States)
Zachary Roth, The Univ. of North Carolina at Charlotte (United States)
Menelaos Poutous, The Univ. of North Carolina at Charlotte (United States)
Eric G. Johnson, The Univ. of North Carolina at Charlotte (United States)
Martin Richardson, CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)


Published in SPIE Proceedings Vol. 7580:
Fiber Lasers VII: Technology, Systems, and Applications
Kanishka Tankala, Editor(s)

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