Abstract
Recent progress in multi-mode parallel pumping techniques led to the development of a new class of compact, all-fiber format seeded Yb and Er sources operating around 1 and 1.5 μm, average power levels in excess of 10 W, and lifetimes over 100 years of continuous operation. These seeded sources are capable of providing high average and peak fundamental powers and in combination with highly nonlinear periodically poled materials allow up to 40-80% efficient single-pass second-harmonic generation (SHG) with average power levels up to several watts.12 This makes efficient second-stage up-frequency conversion of these sources into the ultraviolet possible. Recently we demonstrated UV generation at 384 nm by using tandem SHG in PPKTP and PPLT.3 To access the deeper UV around 265 nm, poled materials with under 1 μm period, and transparency at 265 nm are required. PPLT is unsuitable for this application. On the other hand, with peak power levels of several hundred Watts after the first stage SHC in periodically pofed materials, the use of bulk crystals for fourth harmonic generation (FHG) may still be a technologically promising approach. Hundreds of milliwatts of deep UV could be generated in single-pass configuration. Resulting medium power, compact, fiber-based UV sources will find their unique application niche as none of the traditional FHG, large frame laser systems4,5 compete in equivalent power range and at the same time offer single-mode fiber delivery of the fundamental, comparable lifetimes, efficiency, compactness, and simplicity of operation.
© 2002 Optical Society of America
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