Jonas Jakutis Neto

Investigation of blue emission from Raman-active crystals: Its origin and impact on laser performance

The origin and consequences to laser performance of blue emission observed in some Raman crystals has been studied in detail, leading us to attribute the origin of the phenomenon to fluorescence from Tm3+(1G4) impurity ions which are excited via sequential upconversion. For the specific case of a Nd:YLF/KGW Raman laser, we show that the blue fluorescence has modest but significant impacts on laser performance and thermal loading. If the blue fluorescence was eliminated, then laser efficiency could be increased by 15% and thermal loading in the KGW crystal reduced by 17%.

Two new blue laser emission lines from an intracavity Raman laser

Here we report quasi-CW operation of intracavity Raman laser generating three blue laser emission lines at 454 nm, 473 nm and 495 nm with a maximum output power of 230 mW.

LD-side-pumped Nd:YVO4 self-Raman laser at 1176 nm

We demonstrate a diode-side-pumped Nd:YVO4 self-Raman laser at 1176 nm in a grazing incidence configuration operating in quasi-continuous mode. More than 8 W of output power was achieved in multimode operation, corresponding to a slope efficiency of 15%. With TEM00 mode operation is also demonstrated.

Investigation of a Blue Luminescence Power in Raman Crystals

In order to improve the crystalline Raman lasers performance, this work presents the characterization of the power extracted by a blue luminescence present in some of the Raman crystals, seen as probable source of loss.

High beam quality cw 1.5 W BaWO 4 Raman laser using Nd:YLF as laser active medium

1.5 W of 1st Stokes, 1167 nm, cw output power was produced using a Nd:YLF laser crystal associated to a BaWO4 Raman crystal. The laser built provided a M2 of 1.51 and 1.43, vertical and horizontal, respectively. This high beam quality and Watt level power laser was built in a long cavity, demonstrating the advantages of Nd:YLF, which will ultimately enable low amplitude noise Raman lasers and allowing long length cavity geometries, such as “V” shape, for better conversion efficiencies. A preliminary result for a cw 583 nm laser has delivered 0.61 W of output power.