20 May 2015 Higher order mode selection for power scaling in laser resonators using transmitting Bragg gratings
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Abstract
Power scaling using a higher order mode in a ribbon fiber has previously been proposed. However, methods of selecting the higher order mode and converting to a single lobe high brightness beam are needed. We propose using a multiplexed transmitting Bragg grating (MTBG) to convert a higher order mode into a single lobe beam. Using a ribbon fiber with core dimensions of 107.8 μm by 8.3 μm, we use the MTBG to select a higher order mode oscillating within the resonator with 51.4% efficiency, while simultaneously converting the higher order mode to a beam with diffraction limited divergence of 10.2 mrad containing 60% of the total power.
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Brian M. Anderson, Brian M. Anderson, George Venus, George Venus, Dan Ott, Dan Ott, Evan Hale, Evan Hale, Ivan Divliansky, Ivan Divliansky, Derrek R. Drachenberg, Derrek R. Drachenberg, Jay Dawson, Jay Dawson, Mike J. Messerly, Mike J. Messerly, Paul H. Pax, Paul H. Pax, John B. Tassano, John B. Tassano, Leonid B. Glebov, Leonid B. Glebov, } "Higher order mode selection for power scaling in laser resonators using transmitting Bragg gratings", Proc. SPIE 9466, Laser Technology for Defense and Security XI, 94660C (20 May 2015); doi: 10.1117/12.2177060; https://doi.org/10.1117/12.2177060
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