Search results for: Steven R Bowman
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Broadband transparency, high thermal conductivity, and strong nonlinearity make gallium nitride a promising material for high power frequency conversion. We have fabricated and tested periodically oriented gallium nitride (PO-GaN) devices for quasi-phase matched (QPM) frequency conversion.
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Methods for growing periodically alternating polarities of GaN on N-polar and Ga-polar GaN substrates have been developed. The resulting periodically oriented samples can be extended to thick growth, allowing their use in non-linear optics.
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Nanoscale Research Letters > 2013 > 8 > 1 > 1-11
Crystalline hosts with low phonon energies enable novel energy transfer processes when doped with rare earth ions. Two applications of energy transfer for rare earth ions in thulium-sensitized low phonon energy crystals that result in infrared luminescence are discussed. One application is an endothermic, phonon-assisted cross-relaxation process in thulium-doped yttrium chloride that converts lattice...
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Methods for growing periodically alternating polarities of GaN on GaN substrates have been developed. The resulting periodically oriented samples can be extended to thick growth, allowing their use in non-linear optics.
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Optical Materials > 2010 > 32 > 9 > 1050-1054
In order to study the feasibility of power scaling in resonantly-pumped Er-doped lasers, the fractional heat loads of several laser materials were measured using direct thermocouple calorimetry under low-power illumination with ∼1550nm light. A sample of 2% Er:YAG exhibited heat loads (relative to the absorbed power) of less than 5.4%, while samples of 1.1% Er-doped fluorophosphate glasses showed...
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A room temperature 4.5µm laser is reported in Er: KPb2Cl5 crystals using 0.8µm diode excitation. Long fluorescent lifetimes lead to important ETU and ESA processes. The impact of these excitation channels on laser performance is assessed.
