Novel Wavelengths Watt-Level Pr3+:LiYF4 Orange Lasers

We report the first demonstration on four new wavelengths of 609 nm, 613 nm, 618 nm in both $\sigma $ - and $\pi $ -polarized direction based on continuous-wave Pr $^{3+}$ :LiYF4(Pr $^{3+}$ :YLF) lasers. The transitions mechanism combined dual upper energy levels of $^{3}\text{P}_{1}$ and $^{1}\text{I}_{6}$ with Stark sub-levels of $^{3}\text{H}_{6}$ and $^{3}\text{F}_{2}$ was designated. The CW lasers achieve output power greater than watt levels at room temperature, with 2.36 W at 609 nm, 1.85 W at 618 nm, in the $\sigma $ -polarized direction and 1.93 W at 613 nm, 1.40 W at 618 nm, in the $\pi $ -polarized direction.