Cryogenic Ceramic 277 Watt Yb: YAG Thin-Disk Laser
Journal Article - Open Access
University of New Mexico Albuquerque United States
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A ceramic ytterbiumyttrium aluminum garnet YbYAG thindisk laser is investigated at 15 deg C 288 K and also at 80 K, where it behaves as a four-level laser. We introduce a new two-phase spray cooling method to cool the YbYAG. One system relies on R134a refrigerant while the other uses liquid nitrogen LN2. The use of two systems allows the same disk to be tested at the two temperatures. When the YbYAG is cooled from room to cryogenic temperatures, the lasing threshold drops from 155 W to near 10 W, while the slope efficiency increases from 54 to a 63. A 277 W laser with 520 W of pump is demonstrated. We also model the thermal and structural properties at these two temperatures and estimate the beam quality.
- Lasers and Masers