Journal
OPTICS EXPRESS
Volume 18, Issue 9, Pages 9628-9633Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.009628
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- NSF
- FAPESP
- CNPq
- CAPES (Brazil)
- Air Force Office of Scientific Research [FA9550-07-1-0374]
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We present a broadband (460-980 nm) analysis of the nonlinear absorption processes in bulk ZnO, a large-bandgap material with potential blue-to-UV photonic device applications. Using an optical parametric amplifier we generated tunable 1-kHz repetition rate laser pulses and employed the Z-scan technique to investigate the nonlinear absorption spectrum of ZnO. For excitation wavelengths below 500 nm, we observed reverse saturable absorption due to one-photon excitation of the sample, agreeing with rate-equation modeling. Two-and three-photon absorption were observed from 540 to 980 nm. We also determined the spectral regions exhibiting mixture of nonlinear absorption mechanisms, which were confirmed by photoluminescence measurements. (C) 2010 Optical Society of America
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