Extremely efficient direct third harmonic generation in thin nanostructured films of ZnO
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We report a very efficient nonlinear optical conversion in thin films of wide band-gap materials. Very high conversion efficiency to the third harmonic radiation is achieved for an unamplified femtosecond Cr4+:forsterite laser in a sub-micron-thick film of a nanocrystalline ZnO pulsed-laser deposited on a fused silica substrate. Both the nonlinear optical coefficient and the coherence length are measured for a film composed of 10-nm nanoclusters.
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Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III