Fiber amplifier based UV laser source

We demonstrate 30 W of average UV power, at 353 nm, by harmonically converting the output of a seeded cascade of fiber amplifiers operating at 1060 nm. The UV output represents 46% harmonic conversion efficiency from the fundamental beam. The all-fiber-amplifier, MOPA architecture supports variable pulse repetition frequencies and pulse widths. We demonstrate pulse repetition frequencies up to 2 MHz and pulse widths as short as 2 ns. Two bulk LBO crystals, oriented for second and third harmonic conversion, are used to obtain stable UV output power. A turnkey system using this architecture is commercially available. The system is entirely air-cooled and operates from a standard wall plug electric service, facilitating integration into various material processing applications.