Direct diode-pumped integrated Tm:YAG/Ho:YAP laser

Abstract We demonstrate a compact diode-pumped Ho laser via integrating heterogenous Tm-doped and Ho-doped gain media into a single bulk gain medium for the first time. After achieving efficient Ho laser operation from the Tm:YAG intra-cavity pumped Ho:YAP scheme, with an maximum output power of 6.6 W, the integrated Tm:YAG/Ho:YAP laser was realized with a maximum output power of 5.1 W at 2129.7 nm, corresponding to a slope efficiency of 25.4% and optical conversion efficiency of 21.6% by considering the absorbed diode pump power.