منابع مشابه
Two-photon absorption in potassium niobate
We report measurements of thermal self-locking of a Fabry–Perot cavity containing a potassium niobate (KNbO3) crystal. We develop a method to determine linear and nonlinear optical absorption coefficients in intracavity crystals by detailed analysis of the transmission line shapes. These line shapes are typical of optical bistability in thermally loaded cavities. For our crystal we determine th...
متن کاملVibration and two-photon absorption
A treatment of nuclear vibrational motions in two-photon absorption is laid out in detail. Perturbation theory is used to develop working formulas for diatomic molecules and tested for the X S – A P transition of carbon monoxide. The results are compared with the exact numerical values. Certain vibrational contributions, not previously recognized, are found to make an important contribution to ...
متن کاملPhoton energy upconversion in porphyrins: one-photon hot-band absorption versus two-photon absorption
We study the porphyrin S1 ! S0 fluorescence and the photosensitized singlet oxygen Dg ! Rg phosphorescence, both originating from absorption of photons with energy less than the porphyrin S0 ! S1 transition energy. By measuring the excitation intensity dependence of fluorescence at lowered sample temperatures, we are able to discriminate between two parallel processes of one-photon hot-band abs...
متن کاملTwo-step four-photon absorption.
We report a theoretical investigation of effective four-photon absorption (4PA) process and propose a two-step 4PA model of three-photon- induced excited-state absorption (ESA). Based on three-level rate-equation theory, we find an analytical result for the effective 4PA coefficient that depends on the three-photon absorption (3PA) cross-section, excited-state photophysical properties, and lase...
متن کاملInfrared single-photon detection by two-photon absorption in silicon
We propose a scheme for infrared single-photon detection based on two-photon absorption at room temperature in Si avalanche photodiodes, where the detected photon’s energy is lower than the band gap and the energy difference is complemented by a pump field. A quantum nonperturbative model is developed for nondegenerate two-photon absorption in direct and indirect semiconductors yielding proper ...
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ژورنال
عنوان ژورنال: Journal of the Optical Society of America B
سال: 2001
ISSN: 0740-3224,1520-8540
DOI: 10.1364/josab.18.001813