6 March 2013 Versatile fs laser-written glass chip lasers
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We report laser-written chip lasers with potential to be a platform planar technology versatile enough to cover the visible through to the mid-infrared spectral region. By femtosecond laser direct-writing a thulium doped fluoride based glass host (ZBLAN), we have demonstrated a 151% quantum efficiency λ=1.9 μm laser with a close to diffraction limited beam quality (M2~ 1.12 ± 0.08) with 225 nm of continuous tunability in a device that can be rapidly fabricated by singlestep optical processing. The 9 mm long planar chip developed for concept demonstration contains fifteen large modearea waveguides that can operate in semi-monolithic or external cavity laser configurations. This chip laser has achieved the highest quantum efficiency from a planar glass waveguide laser. The depressed cladding geometry supports the largest fundamental modes reported for a rare-earth doped waveguide laser thereby favouring high peak-power operation which is demonstrated by achieving 1.9 kW peak-power pulses when Q-switched.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
D. G. Lancaster, D. G. Lancaster, S. Gross, S. Gross, A. Fuerbach, A. Fuerbach, H. Ebendorff Heidepriem, H. Ebendorff Heidepriem, T. M. Monro, T. M. Monro, M. J. Withford, M. J. Withford, "Versatile fs laser-written glass chip lasers", Proc. SPIE 8599, Solid State Lasers XXII: Technology and Devices, 859907 (6 March 2013); doi: 10.1117/12.2012519; https://doi.org/10.1117/12.2012519

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