Watt-Level Pr3+:LiYF4 Novel Green Lasers at 519 nm, 538 nm, and 550 nm

Abstract

We report the first demonstration on three new wavelengths of 519 nm, 538 nm, 550 nm in the $\sigma $ -polarized direction based on continuous-wave (CW) Pr3+:LiYF $_{\mathbf {4}}$ laser. The transitions mechanism combined dual upper energy levels of $^{3}\text{P}_{\mathbf {1}}$ and $^{3}\text{P}_{\mathbf {0}}$ with Stark sub-levels of $^{3}\text{H}_{\mathbf {5}}$ was proposed. The CW lasers achieve output power greater than watt levels in the $\sigma $ -polarized direction at room temperature, with 1.21 W at 519 nm, 1.45 W at 538 nm, and 1.06 W at 550 nm.