Lasing in a Tm:Ho:Yb3Al5O12 crystal pumped into the 3H6 – 3F4 transition

A growth technology has been developed, and a Tm:Ho:Yb₃Al₅O₁₂ laser crystal of high optical quality has been grown by Czochralski method. Its spectral and luminescent characteristics are studied. Lasing at a wavelength of 2100 nm is obtained under pumping into the absorption line on the ³H₆ – ³F₄ transition of the Tm³⁺ ion at a wavelength of 1678 nm. The slope and total (optical) efficiencies of the laser at an output power of up to 320 mW reach 41% and 30%, respectively.