Double clad YAG crystalline fiber waveguides for diode pumped high power lasing

Xiaodong Mu; Stephanie Meissner; Helmuth Meissner; Anthony W. Yu

doi:10.1117/12.2048223

28 February 2014 Double clad YAG crystalline fiber waveguides for diode pumped high power lasing

Xiaodong Mu, Stephanie Meissner, Helmuth Meissner, Anthony W. Yu

Proceedings Volume 8959, Solid State Lasers XXIII: Technology and Devices; 895906 (2014) https://doi.org/10.1117/12.2048223
Event: SPIE LASE, 2014, San Francisco, California, United States

Abstract

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.

Citation Download Citation

Xiaodong Mu, Stephanie Meissner, Helmuth Meissner, and Anthony W. Yu "Double clad YAG crystalline fiber waveguides for diode pumped high power lasing", Proc. SPIE 8959, Solid State Lasers XXIII: Technology and Devices, 895906 (28 February 2014); https://doi.org/10.1117/12.2048223

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