19 March 2018 2-micron lasing in Tm:Lu2O3 ceramic: initial operation
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Abstract
We report on initial lasing of Tm:Lu2O3 ceramic laser with tunable output in the vicinity of 2 μm. Tm:Lu2O3 ceramic gain materials offer a much lower saturation fluence than the traditionally used Tm:YLF and Tm:YAG materials. The gain element is pumped by 796 nm diodes via a "2-for-1" crossrelaxation energy transfer mechanism, which enables high efficiency. The high thermal conductivity of the Lu2O3 host (~18% higher than YAG) in combination with low quantum defect of ~20% supports operation at high-average power. Konoshima’s ceramic fabrication process overcomes the scalability limits of single crystal sesquioxides. Tm:Lu2O3 offers wide-bandwidth amplification of ultrashort pulses in a chirped-pulse amplification (CPA) system. A laser oscillator was continuously tuned over a 230 nm range from 1890 to 2120 nm while delivering up to 43W QCW output with up to 37% efficiency. This device is intended for initial testing and later seeding of a multi-pass edge-pumped disk amplifier now being developed by Aqwest which uses composite Tm:Lu2O3 disk gain elements.
Conference Presentation
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John Vetrovec, John Vetrovec, David M. Filgas, David M. Filgas, Carey A. Smith, Carey A. Smith, Drew A. Copeland, Drew A. Copeland, Amardeep S. Litt, Amardeep S. Litt, Eldridge Briscoe, Eldridge Briscoe, Ernestina Schirmer, Ernestina Schirmer, } "2-micron lasing in Tm:Lu2O3 ceramic: initial operation", Proc. SPIE 10511, Solid State Lasers XXVII: Technology and Devices, 1051103 (19 March 2018); doi: 10.1117/12.2291380; https://doi.org/10.1117/12.2291380
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