Results 261 to 270 of about 165,132 (302)
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Analysis of optical locking applied for rephasing halt in photon echoes
Journal of the Optical Society of America B, 2011Optical locking applied to rephased atoms in photon echoes is analyzed for on-demand photon storage time extension, where the storage time extension is confined by the inverse of spin inhomogeneous broadening. Both optical locking and photon storage mechanisms in atomic frequency comb echoes are discussed and compared with those in two-pulse photon ...
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IEICE Transactions on Electronics, 2011
We report on the enhancement of system detection efficiency in a superconducting nanowire single-photon detector (SNSPD) by applying the optical cavity structure. The nanowire was made using 4-nm-thick NbN thin films and covered with an SiO cavity and Au mirror designed for 1300-1600nm wavelengths. The device is mounted into fiber-coupled packages, and
Shigehito MIKI +4 more
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We report on the enhancement of system detection efficiency in a superconducting nanowire single-photon detector (SNSPD) by applying the optical cavity structure. The nanowire was made using 4-nm-thick NbN thin films and covered with an SiO cavity and Au mirror designed for 1300-1600nm wavelengths. The device is mounted into fiber-coupled packages, and
Shigehito MIKI +4 more
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2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID), 2019
We investigate the nonlinear optical properties of a series of two-photon absorbing chromophores in the femtosecond regime using both two-photon induced fluorescence spectroscopy and the Z-scan technique. We apply a simplified sum-over-states model to the experimental data to predict nonlinear refraction.
Trenton R. Ensley +4 more
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We investigate the nonlinear optical properties of a series of two-photon absorbing chromophores in the femtosecond regime using both two-photon induced fluorescence spectroscopy and the Z-scan technique. We apply a simplified sum-over-states model to the experimental data to predict nonlinear refraction.
Trenton R. Ensley +4 more
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Optics Communications, 2007
Abstract A new broadband filter, based on the high-order band gap in one-dimensional photonic crystal (PCs) of the form Si∣air∣Si∣air∣Si∣air∣Si∣air∣Si∣air∣Si, has been designed by the plane wave expansion method (PWEM) and transfer matrix method (TMM) and fabricated by lithography.
Xiaodong Lu +7 more
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Abstract A new broadband filter, based on the high-order band gap in one-dimensional photonic crystal (PCs) of the form Si∣air∣Si∣air∣Si∣air∣Si∣air∣Si∣air∣Si, has been designed by the plane wave expansion method (PWEM) and transfer matrix method (TMM) and fabricated by lithography.
Xiaodong Lu +7 more
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Journal of the Optical Society of America B, 1996
Transient-grating techniques are used to investigate the picosecond dynamics of photoexcited carriers in a range of n- and p-doped ZnSe thin-film layers grown by molecular-beam epitaxy. Two-photon absorption is employed experimentally to generate known excitation levels, comparable with those under laser action in II–VI diode structures.
I. J. Blewett +3 more
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Transient-grating techniques are used to investigate the picosecond dynamics of photoexcited carriers in a range of n- and p-doped ZnSe thin-film layers grown by molecular-beam epitaxy. Two-photon absorption is employed experimentally to generate known excitation levels, comparable with those under laser action in II–VI diode structures.
I. J. Blewett +3 more
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Review of Scientific Instruments, 1981
An electro-optical pulse selection system for mode-locked cw lasers is described. The repetition rate of the exciting pulses can be chosen by electronically dividing the mode locker drive frequency. The shortest repetition time for pulse picking is 3 μs.
van Hoek, A., Visser, A.J.W.G.
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An electro-optical pulse selection system for mode-locked cw lasers is described. The repetition rate of the exciting pulses can be chosen by electronically dividing the mode locker drive frequency. The shortest repetition time for pulse picking is 3 μs.
van Hoek, A., Visser, A.J.W.G.
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The Journal of Physical Chemistry A, 1999
Degenerate four-wave mixing (DFWM) spectroscopy is modified to exploit femtosecond pulses, phase-sensitive-detection, frequency (wavelength) agility, two-color (nearly degenerate multiwave mixing) radiation, and improved signal-to-noise capabilities that can be realized through a combination of new solid state lasers, nonlinear optical components, and ...
K. A. Drenser +3 more
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Degenerate four-wave mixing (DFWM) spectroscopy is modified to exploit femtosecond pulses, phase-sensitive-detection, frequency (wavelength) agility, two-color (nearly degenerate multiwave mixing) radiation, and improved signal-to-noise capabilities that can be realized through a combination of new solid state lasers, nonlinear optical components, and ...
K. A. Drenser +3 more
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Optical Engineering, 2007
A new broadband filter, based on the high level bandgap in 1-D photonic crystals (PCs) of the form Si|air|Si|air|Si|air|Si|air|Si|air|Si is designed by the plane wave expansion method (PWEM) and the transfer matrix method (TMM) and fabricated by lithography.
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A new broadband filter, based on the high level bandgap in 1-D photonic crystals (PCs) of the form Si|air|Si|air|Si|air|Si|air|Si|air|Si is designed by the plane wave expansion method (PWEM) and the transfer matrix method (TMM) and fabricated by lithography.
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Microwave and Optical Technology Letters
AbstractIn this study, a novel freeform surface lens coupler is designed to realize the coupling functions in the hollow‐core photonic crystal fiber (HCPCF) resonator optical gyroscope. One surface of the lens is an ellipsoid. Coupling of the two HCPCF loop's ports can be directly accomplished via reflection on the ellipsoid surface.
Wen Fan +6 more
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AbstractIn this study, a novel freeform surface lens coupler is designed to realize the coupling functions in the hollow‐core photonic crystal fiber (HCPCF) resonator optical gyroscope. One surface of the lens is an ellipsoid. Coupling of the two HCPCF loop's ports can be directly accomplished via reflection on the ellipsoid surface.
Wen Fan +6 more
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An Improved Delay Time Of Optical Half-Adder Applying Nonlinear Photonic Crystals Technology
2023 2nd International Conference on Electronics, Energy and Measurement (IC2EM), 2023Bouaouina Mohamed Salah +1 more
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