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17 Aug 1998

Volume 73, Issue 7, pp. 865-1010

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Domain broadening in quasi-phase-matched nonlinear optical devices

G. Rosenman, Kh. Garb, A. Skliar, M. Oron, D. Eger, and M. Katz

Appl. Phys. Lett. 73, 865 (1998); http://dx.doi.org/10.1063/1.121969 (3 pages) | Cited 34 times

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Dominant factors influencing domain broadening in periodically poled ferroelectric domain structures for quasi-phase-matched nonlinear optical converters are studied. It is shown that fabricated patterned switching electrode gives rise to a high tangential field causing polarization inversion behind an isolated layer of the patterned electrode. The domain broadening depends on basic electron parameters of a ferroelectric crystal such as surface electron concentration and electron mobility. © 1998 American Institute of Physics.
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42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
42.79.Nv Optical frequency converters
85.50.-n Dielectric, ferroelectric, and piezoelectric devices
42.86.+b Optical workshop techniques
77.22.Ej Polarization and depolarization
77.80.Dj Domain structure; hysteresis

Modeling the optical properties of hexagonal GaN

Aleksandra B. Djurišić and E. Herbert Li

Appl. Phys. Lett. 73, 868 (1998); http://dx.doi.org/10.1063/1.121970 (3 pages) | Cited 11 times

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An adjustable broadening function instead of the conventional Lorentzian one is incorporated in the dielectric function model for hexagonal GaN. One-electron contributions at E1 critical points and higher-state (m>1) exciton terms, which were incorrectly disregarded in the previous study, are taken into account. Model parameters were determined using the acceptance-probability-controlled simulated annealing. As a result, excellent agreement with experimental data for both real and imaginary parts in the range from 1.5 to 10 eV is obtained. Average discrepancy between experimental and calculated data for the real part of the index of refraction equals 2.75×10−4, and for the imaginary part is 1.66×10−3. © 1998 American Institute of Physics.
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78.20.Ci Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity)
71.45.Gm Exchange, correlation, dielectric and magnetic response functions, plasmons
42.25.-p Wave optics
71.35.-y Excitons and related phenomena

Photon generation by silicon diodes in avalanche breakdown

N. Akil, S. E. Kerns, D. V. Kerns, A. Hoffmann, and J-P. Charles

Appl. Phys. Lett. 73, 871 (1998); http://dx.doi.org/10.1063/1.121971 (2 pages) | Cited 15 times

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Light emission from a p-n diode biased in controlled avalanche breakdown has been measured over the photon energy range 1.4–3.4 eV. Previously published models are compared with measured data to associate specific mechanisms with avalanche photon emission in silicon. A multimechanism model fitting the measured spectrum is presented. © 1998 American Institute of Physics.
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85.60.Dw Photodiodes; phototransistors; photoresistors
85.30.De Semiconductor-device characterization, design, and modeling
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions
77.22.Jp Dielectric breakdown and space-charge effects
72.20.Ht High-field and nonlinear effects

Ultrafast generation of blue light by efficient second-harmonic generation in periodically-poled bulk and waveguide potassium titanyl phosphate

Y. Wang, V. Petrov, Y. J. Ding, Y. Zheng, J. B. Khurgin, and W. P. Risk

Appl. Phys. Lett. 73, 873 (1998); http://dx.doi.org/10.1063/1.121972 (3 pages) | Cited 8 times

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We have investigated second-harmonic generation in short-period periodically-poled bulk and waveguide potassium titanyl phosphate crystals to generate blue light using subpicosecond laser pulses. For the bulk, the highest conversion efficiency is ≈ 5.5%, which is about two orders of magnitude larger than that achieved previously. For the waveguide, the highest conversion efficiency is ≈ 32%, which is about a factor of 4 higher than that obtained before. These measured values are in good agreement with our theoretical results. We have observed saturation of conversion efficiency, which sets a limit to the maximum efficiency that can be achieved. © 1998 American Institute of Physics.
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42.65.Ky Frequency conversion; harmonic generation, including higher-order harmonic generation
42.65.Re Ultrafast processes; optical pulse generation and pulse compression
42.79.Nv Optical frequency converters
78.47.-p Spectroscopy of solid state dynamics
42.65.Wi Nonlinear waveguides
42.79.Gn Optical waveguides and couplers

Coherent control of optical gain from electronic intersubband transitions in semiconductors

Xuedong Hu and Walter Pötz

Appl. Phys. Lett. 73, 876 (1998); http://dx.doi.org/10.1063/1.121973 (3 pages) | Cited 9 times

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We study electronic transitions between a subband and a lower subband doublet which is driven by a coherent microwave (MW) field in a semiconductor double well structure. Within a microscopic three-band model, we show that variation of the MW phase allows manipulation of the optical gain provided the probe pulse duration is shorter than the period of the MW-field-generated interband polarization in the doublet. Moreover, we find that optical gain without inversion can be achieved in spite of subpicosecond dissipative mechanisms provided by electron-phonon coupling and electron tunneling into and out of the double well. © 1998 American Institute of Physics.
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78.66.-w Optical properties of specific thin films
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
42.55.Px Semiconductor lasers; laser diodes
73.40.Gk Tunneling
71.38.-k Polarons and electron-phonon interactions

Energy transfer from a naphthalimide functionalized side chain polymer towards DCM used as a dopant molecule

C.-M. Bouché, P. Le Barny, H. Facoetti, and P. Robin

Appl. Phys. Lett. 73, 879 (1998); http://dx.doi.org/10.1063/1.122025 (3 pages) | Cited 2 times

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The influence of the introduction of a dopant molecule, namely DCM, in a matrix of a naphthalimide derived polymer (PNI) is studied by means of UV-visible absorption spectroscopy, photoluminescence emission and excitation spectrometry, and 2D photoluminescence spectrometry. We demonstrate that, contrary to previous observations on similar systems, energy transfer occurs between PNI and DCM. Moreover, photoluminescent (PL) and electroluminescent (EL) emissions are assigned to arise from the same excited state. © 1998 American Institute of Physics.
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78.55.Kz Solid organic materials
42.70.Jk Polymers and organics
78.60.Fi Electroluminescence
78.40.Me Organic compounds and polymers
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