Orthogonal polarization dual-wavelength Nd: GdVO₄ laser at 1341 nm and 1344 nm with 880 nm LD direct pumping

We report an orthogonal polarization dual-wavelength Nd:GdVO₄ crystal laser with 880 nm LD directly pumping. By adjusting the tilting angle of an uncoated BK7 glass plate inserted in the cavity to change the transmittance of two polarization emission to balance the gain and cavity losses of these emission, an orthogonal polarization dual-wavelength laser at 1340.9 nm (π-polarization) and 1344.4 nm (σ-polarization) is obtained. To the best of our knowledge, this is the first demonstration of orthogonal polarization dual-wavelength lasers in Nd:GdVO₄ crystal at 1.3 μm. With an incident pump power of 13.9 W, the total output power of the dual-wavelength laser is about 1.18 W, with individual power of 0.45 W and 0.68 W at 1340.9 and 1344.4 nm respectively. Such dual-wavelength laser is potential to apply for terahertz emission with nonlinear difference frequency technology.