Judd-Oflet analysis of spectrum and laser performance of Ho：YAP crystal end-pumped by 1.91μm Tm：YLF laser

The Ho:YAP crystal is grown by the Czochralski technique.The room temperature polarized absorption spectra of Ho:YAP crystal was measured on a c cut sample with 1 at% holmium.According to the obtained Judd-Ofelt intensity parameters Ω2 = 1.42 × 10-20 cm2,Ω4 = 2.92 × 10-20 cm2,and Ω6 = 1.71 × 10-20 cm2,this paper calculated the fluorescence lifetime to be 6 ms for 5I7 →5 I8 transition,and the integrated emission cross section to be 2.24×10-18 cm2.It investigates the room temperature Ho:YAP laser end pumped by a 1.91 μm Tm:YLF laser.The maximum output power was 4.1 W when the incident 1.91 μm pump power was 14.4 W.The slope efficiency is 40.8%,corresponding to an optical to optical conversion efficiency of 28.4%.The Ho:YAP output wavelength was centred at 2118 nm with full width at half maximum of about 0.8 nm.

Judd--Oflet analysis of spectrum and laser performance of Ho:YAP crystal end-pumped by 1.91-μm Tm:YLF laser

The Ho:YAP crystal is grown by the Czochralski technique. The room-temperature polarized absorption spectra of Ho:YAP crystal was measured on a c-cut sample with 1 at{\%} holmium. According to the obtained Judd--Ofelt intensity parameters ${\it\Omega}_{2}=1.42\times 10^{-20}$\,cm$^{2}$, ${\it\Omega}_{4}=2.92\times 10^{-20}$\,cm$^{2}$, and ${\it\Omega} _{6}=1.71\times 10^{-20}$\,cm$^{2}$, this paper calculated the fluorescence lifetime to be 6\,ms for $^{5}I_{7}\to^{5}I_{8}$ transition, and the integrated emission cross section to be $2.24\times 10^{ - 18}$\,cm$^{2}$. It investigates the room-temperature Ho:YAP laser end-pumped by a 1.91-$\mu $m Tm:YLF laser. The maximum output power was 4.1\,W when the incident 1.91-$\mu $m pump power was 14.4\,W. The slope efficiency is 40.8{\%}, corresponding to an optical-to-optical conversion efficiency of 28.4{\%}. The Ho:YAP output wavelength was centred at 2118\,nm with full width at half maximum of about 0.8\,nm.