Sapphire-conductive end-cooling of high power cryogenic Yb:YAG lasers
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- Tokita, S., Kawanaka, J., Fujita, M. et al. Appl. Phys. B (2005) 80: 635. doi:10.1007/s00340-005-1779-4
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We have demonstrated a high-power laser oscillator with end-cooling using a sapphire-sandwiched Yb:YAG disk at near liquid nitrogen temperature. An output power of 75 W with a near-diffraction-limited beam was obtained from a 0.6-mm thick activemedium. The slope efficiency and themaximum optical–optical efficiency were 80 and 70%, respectively, with respect to absorbed pump power.