Journal
OPTICS EXPRESS
Volume 18, Issue 26, Pages 26843-26853Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.026843
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Funding
- National Science Foundation of China [10704042, 10934003]
- Program for New Century Excellent Talents in University
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Based on the simplified five-level rate-equation theory, we investigate the hybrid third-order optical nonlinear processes which combine the instantaneous nonlinearity and the one-photon absorption induced excited-state nonlinearity. We obtain the analytical third-order nonlinear absorption and refraction coefficients originating from the singlet and triplet excited-state effects. We explore the photodynamic process and give the corresponding level diagram in the nanosecond, picosecond, and femtosecond regimes. We develop the pulse-duration-dependent Z-scan theory for characterizing the simultaneous instantaneous nonlinearity and cumulative effect of the excited-state nonlinearity. We also demonstrate the validity of the presented theory to analyze the experimental results. (C) 2010 Optical Society of America
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