Rapid Communication

Applied Physics B

, Volume 80, Issue 6, pp 635-638

First online:

Sapphire-conductive end-cooling of high power cryogenic Yb:YAG lasers

  • S. TokitaAffiliated withInstitute of Laser Engineering, Osaka University Email author 
  • , J. KawanakaAffiliated withInstitute of Laser Engineering, Osaka University
  • , M. FujitaAffiliated withCentral Research Laboratory
  • , T. KawashimaAffiliated withCentral Research Laboratory
  • , Y. IzawaAffiliated withInstitute of Laser Engineering, Osaka University

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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.


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