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Third harmonic generation is demonstrated in a novel dielectric mirror made of aperiodic layers of HfxAlyO and SiO2. One percent conversion has been measured with 70-fs pulses and efficiencies larger than ten percent seem possible.
Third harmonic microscopy is applied to probe electron densities in femtosecond laser-induced air plasmas, determine nonlinear susceptibilities of thin films, and image nascent, laser incubated, and laser damaged dielectric coatings with unprecedented contrast. The relative contribution of signals from the layer of interest and its surroundings is analyzed.
Optical multilayer materials HfO2 and SiO2 exhibit subpicosecond laser damage thresholds of just 10% of their intrinsic value when tested in vacuum. A few Torr of water vapor is shown to remedy this effect.
We discuss our recent progress using IBAD MgO as a template for subsequent deposition of YBa 2 Cu 3 O 7-δ (YBCO) high-temperature superconductors on metallic substrate tapes. We have refined the process by improving substrate preparation and by using reflected high-energy electron diffraction to monitor and improve IBAD MgO films. High quality, continuously processed...
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