22 February 2013 Fabrication and characterization of gain guided, index anti-guided planar waveguide laser resonator
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Abstract
Gain-guided and index anti-guided waveguides hold great promise to increase laser output power while maintaining single mode operation. Although lasing in GG-IAG fibers was demonstrated, slope efficiency is poor and output power is low. This work presents the first, to the best of our knowledge, lasing characteristics of a diode-pumped GG-IAG planar waveguide in a plano-plano resonator configuration. The laser waveguide is fabricated using 1% doped Nd:YAG core with diffusion bonded TGG claddings. With continuous-wave pumping, 8.5% slope efficiency is demonstrated and an output power of 1.5W achieved, the highest power reported so far from a GG-IAG waveguide laser. Under such pumping condition, however, thermal lensing is shown to override gain guiding and mode narrowing is observed.
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Adam Dittli, Tsing-Hua Her, Lee Casperson, "Fabrication and characterization of gain guided, index anti-guided planar waveguide laser resonator", Proc. SPIE 8600, Laser Resonators, Microresonators, and Beam Control XV, 860021 (22 February 2013); doi: 10.1117/12.2005201; https://doi.org/10.1117/12.2005201
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