Highly efficient continuous-wave 912 nm Nd:GdVO₄laser emission under direct 880 nm pumping

TLDR

Comparative results for 808 nm diode pumping into the highly absorbing 4F5/2 level are presented. The study aims to demonstrate the advantages of 880 nm wavelength pumping. We demonstrated a quasi‑three‑level 912 nm CW laser in Nd:GdVO4 pumped at 880 nm, achieving 8.1 W output (13.9 W absorbed) with a slope efficiency of 0.679, marking the first such system.

Abstract

The quasi-three-level 912 nm continuous-wave laser emission under direct diode laser pumping at 880 nm into emitting level 4F3/2 of Nd:GdVO4 have been demonstrated. An end-pumped Nd:GdVO4 crystal yielded 8.1 W of output power for 13.9 W of absorbed pump power. The slope efficiency with respect to the absorbed pump power was 0.679. To the best of our knowledge this is the first demonstration of such a laser system. Comparative results obtained for the pump with diode laser at 808 nm, into the highly-absorbing 4F5/2 level, are given in order to prove the advantages of the 880 nm wavelength pumping.