This work investigates the feasibility of passive cooling in high-power Yb amplifiers. Experimentally, an all-glass airclad step-index (ACSI) amplifier is diode-pumped with 400W and provides 200W power levels. With only natural convection to extract heat, core temperatures are estimated near 130°C with no degradation of performance relative to cooled architectures. Further, advanced analysis techniques allow for core temperature determination using thermal interferometry without the need for complicated stabilization or calibration.
Joshua Bradford, Justin Cook, Jose Enrique Antonio-Lopez, Larry Shah, Rodrigo Amezcua Correa, and Martin Richardson, "Demonstration of passively cooled high-power Yb fiber amplifier," Proc. SPIE 10512, Fiber Lasers XV: Technology and Systems, 105121G (Presented at SPIE LASE: February 01, 2018; Published: 26 February 2018); https://doi.org/10.1117/12.2290243.
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