Cryogenic Yb:YAG lasers operating at 1029 nm have been demonstrated at Snake Creek Lasers with high average
power CW and ultrafast output powers, and provide near diffraction-limited output beams that are ideal for applications
in harmonic generation. We describe experiments that have produced high average power green output power at 515 nm
as well as preliminary experiments producing UV output power at 257.25 nm. Frequency doubling experiments used a
20 mm long non-critically phase-matched LBO crystal mounted in a constant temperature oven. A mode-locked Yb fiber
laser operating at 50 MHz was used to drive a two Yb:YAG cryogenic amplifier system, producing hundreds of watts of
average power output with a FWHM pulsewidth of 12 ps. Doubling efficiencies of > 50 % have been observed. For
frequency quadrupling, we have used hydrothermally grown KTTP crystals grown at Clemson University and Advanced
Photonic Crystals. KBBF offers unprecedented UV transmission down to 155 nm, and was used in a Type I phasematching
configuration. The properties of KBBF will be discussed, as well as the experimental results observed and
conversion efficiency.
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