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28 February 2014 400W Nd:YAG composite ceramic thin-disc laser in 10ns pulse at 167kHz
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Double-clade crystalline fiber waveguide (CFW) has been produced by using adhesive-free bond (AFB®) technology. The waveguide consists of a 1 at.% Yb:YAG core, un-doped YAG inner cladding and ceramic spinel outer cladding. It is a direct analog of the conventional double-clad glass fiber laser in the crystal domain. Signal gain of 45 or 16.5 dB has been measured in a preliminary master oscillator power amplifier (MOPA) experiment. Due to the high laser gain and the weak Fresnel reflection at the uncoated waveguide ends, the CFW even starts self-lasing above a certain pump power. Laser output power of 4 W in the backward propagation direction has been measured for input pump power of 44 W. After considering the same amount of forward propagated laser power, the laser efficiency to the absorbed pump power is estimated to be about 44%. In principle, CFW can have extremely large single mode area for high efficiency and high power laser applications. So far, Single mode area < 6700 μm2 has been demonstrated in Er:YAG CFWs.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
K. Iyama, H. Furukawa, H. Chosrowjan, T. Sakurai, K. Tsubakimoto, H. Yoshida, H. Fujita, M. Fujita, N. Miyanaga, Y. Tamaoki, Y. Kato, and T. Kawashima "400W Nd:YAG composite ceramic thin-disc laser in 10ns pulse at 167kHz", Proc. SPIE 8959, Solid State Lasers XXIII: Technology and Devices, 89590Q (28 February 2014);

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