UV generation by intracavity frequency doubling of an OPS-pumped Pr:YLF laser with 500 mW of cw power at 360 nm

Abstract

In this paper, we report on 500 mW of cw ultraviolet radiation at 360 nm, which has been obtained by intracavity frequency doubling of a Pr:YLF laser, end pumped by 1.8 W Coherent High Power OPS Laser at 479 nm. We have demonstrated the scalability of Pr:YLF laser to pump power of 5.3Watts, resulting in real continuous wave 2.5 Watts of output power at 720 nm and cw 1.3 Watts at 360 nm.

Out of the blue: semiconductor laser pumped visible rare‐earth doped lasers

“…of Pr 3+ gives access to several wavelengths in the UV with only one non‐linear conversion step which can happen very efficiently inside the laser cavity. First experiments in this respect have been conducted , but further improvement of the performance seems to be simple to obtain considering the un‐optimized conditions in these first proof‐of‐principle experiments.…”

“…Lasers with direct emission in the visible spectral range allow for the efficient generation of UV radiation via simple intracavity frequency doubling. Utilizing a 2ω‐OPSL as the pump source, up to 1.3 W and 0.36 W of continuous wave output power could be generated at 360 nm and 320 nm, respectively, by frequency doubling of the deep‐red and red transitions at 720 nm and 640 nm in Pr 3+ :LiYF 4 . In both cases, the optical‐to‐optical efficiency with respect to the absorbed pump power was significantly higher than 20%.…”

Watt-level laser operation of Pr3+:YLF at 696 and 698 nm

“…In particular, the lasers at 696 and 698 nm in the deep red region have served many different purposes. For instance, the method of obtaining ultraviolet (UV) laser by direct frequency doubling of the deep red laser is more compact and has a higher conversion efficiency than the two-stage nonlinear process to generate a UV laser, which is more suitable for obtaining higher-power UV lasers [22][23][24][25][26] . Additionally, the 696 nm lasers can be used for the spectral analysis of the methanol chlorophyll equation [27] , the enzymatic reaction steps of the photoreduction of prochlorophyll-ester [28] , and the improvement of the picture resolution of the Cr(III)tris-oxalato complex [29] .…”

Highly stable UV-mode-locked lasers with an output power of 35 W at 355 nm

“…Recently new approaches for cw UV lasers like frequency tripled cw Nd:YVO 4 -lasers [1], frequency doubled Praseodymium lasers [2], [3] or frequency tripled OPS (optically pumped semiconductor) lasers have been developed [4]. For high power applications, mode-locked Nd:YVO 4 lasers with external frequency tripling can be used.…”