Search Results - "Geels, R.S."

High speed quantum-well lasers and carrier transport effects by Nagarajan, R., Ishikawa, M., Fukushima, T., Geels, R.S., Bowers, J.E.

“…Carrier transport can significantly affect the high-speed properties of quantum-well lasers. The authors have developed a model and derived analytical…”
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Modeling temperature effects and spatial hole burning to optimize vertical-cavity surface-emitting laser performance by Scott, J.W., Geels, R.S., Corzine, S.W., Coldren, L.A.

“…Two-dimensional physical models for single-mode index guided vertical cavity surface emitting lasers (VCSELs) are developed and compared with experimental…”
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Transport limits in high-speed quantum-well lasers: experiment and theory by Nagarajan, R., Fukushima, T., Ishikawa, M., Bowers, J.E., Geels, R.S., Coldren, L.A.

“…It is shown experimentally that the modulation bandwidth of quantum well lasers can be reduced by a factor of six due to carrier transport across undoped…”
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Low threshold planarized vertical-cavity surface-emitting lasers by Geels, R.S., Corzine, S.W., Scott, J.W., Young, D.B., Coldren, L.A.

“…Vertical-cavity surface-emitting lasers fabricated utilizing a self-aligned process to provide planarized contacts are discussed. A single 80-AA In/sub…”
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Strained Ga/sub x/In/sub 1-x/P/(AlGa)/sub 0.5/In/sub 0.5/P heterostructures and quantum-well laser diodes by Bour, D.P., Geels, R.S., Treat, D.W., Paoli, T.L., Ponce, F., Thornton, R.L., Krusor, B.S., Bringans, R.D., Welch, D.F.

“…The properties of (AlGa)/sub 0.5/In/sub 0.5/P, strained Ga/sub x/In/sub 1-x/P/(AlGa)/sub 0.5/In/sub 0.5/P heterostructures, and single quantum well (QW) laser…”
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Narrow-linewidth, low threshold vertical-cavity surface-emitting lasers by Geels, R.S., Coldren, L.A.

“…We report for the first time linewidth measurements of a strained quantum well (SQW) vertical-cavity surface-emitting laser (VCSEL). A straight-forward. high…”
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Design of Fabry-Perot surface-emitting lasers with a periodic gain structure by Corzine, S.W., Geels, R.S., Scott, J.W., Yan, R.-H., Coldren, L.A.

“…A detailed analysis of a Fabry-Perot surface emitting laser (FP-SEL) which utilizes the recently proposed concept of periodic gain is presented. It is shown…”
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InGaAs vertical-cavity surface-emitting lasers by Geels, R.S., Corzine, S.W., Coldren, L.A.

“…The authors give theoretical and experimental results for vertical-cavity surface-emitting lasers (VCSELs). The modeling is applied to the design of InGaAs…”
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Drift leakage current in AlGaInP quantum-well lasers by Bour, D.P., Treat, D.W., Thornton, R.L., Geels, R.S., Welch, D.F.

“…The temperature dependence of threshold current and quantum efficiency for Ga/sub x/In/sub 1-x/P (x=0.4, 0.6; lambda =680, 633 nm) single 80-AA quantum-well…”
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Submilliamp threshold vertical-cavity laser diodes by GEELS, R. S, CODREN, L. A

“…We report for the first time room-temperature, continuous-wave operation of individual vertical-cavity laser diodes with submilliampere threshold currents. A…”
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Design and characterization of In/sub 0.2/Ga/sub 0.8/As MQW vertical-cavity surface-emitting lasers by Geels, R.S., Thibeault, B.J., Corzine, S.W., Scott, J.W., Coldren, L.A.

“…The device design, material characterization, and performance of optimized vertical-cavity surface-emitting lasers (VCSELs) are presented. The basic design…”
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610-nm band AlGaInP single quantum well laser diode by Bour, D.P., Treat, D.W., Beernink, K.J., Krusor, B.S., Geels, R.S., Welch, D.F.

“…The short-wavelength limits of AlGaInP visible laser diodes with Al/sub 0.5/In/sub 0.5/P cladding layers, and Ga/sub x/In/sub 1/spl minus/x/P single quantum…”
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Characteristics of short-wavelength (617< lambda <640 nm) Ga/sub 0.4/In/sub 0.6/P/(Al/sub x/Ga/sub 1-x/)/sub 0.5/In/sub 0.5/P strained, thin multiple-quantum-well lasers by Bour, D.P., Treat, D.W., Thornton, R.L., Bringans, R.D., Paoli, T.L., Geels, R.S., Welch, D.F.

“…The authors examine the operating characteristics of short wavelength (617< lambda <640 nm) AlGaInP lasers containing three thin ( approximately 20 AA)…”
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70-GHz relaxation oscillation in a vertical cavity surface emitting laser by Tauber, D., Wang, G., Geels, R.S., Bowers, J.E., Coldren, L.A.

“…Summary form only given. Very-high-frequency relaxation oscillations were measured in an electrically pumped vertical cavity surface emitting laser (VCSEL)…”
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High-speed single-quantum-well InGaAs/GaAs laser design and experiment by Nagarajan, R., Fukushima, T., Bowers, J.E., Geels, R.S., Coldren, L.A.

“…Summary form only given. The authors report damping factors an order of magnitude lower than previously reported for SQW lasers. They also report bandwidths of…”
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Multi-quantum well electro-optic modulator using a combination of excitonic index and absorption changes by Yan, R.H., Simes, R.J., Geels, R.S., Coldren, L.A., English, J.H., Gossard, A.C.

“…Efficient reflection modulation, using index and absorption changes in a novel p-i-n surface-normal Fabry-Perot resonator configuration, is reported. A reverse…”
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Generation if picosecond pulses with a gain-switched GaAs surface-emitting laser by KARIN, J. R, MELCER, L. G, NAGARAJAN, R, BOWERS, J. E, CORZINE, S. W, MORTON, P. A, GEELS, R. S, COLDREN, L. A

“…Pulses shorter than 4 ps (deconvolved) have been obtained by optically gain switching a GaAs multiple quantum well vertical-cavity surface-emitting laser with…”
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Efficient, narrow-linewidth distributed-Bragg-reflector surface-emitting laser with periodic gain by Corzine, S.W., Geels, R.S., Yan, R.H., Scott, J.W., Coldren, L.A., Gourley, P.L.

“…Efficient, narrow-line emission from a novel vertical cavity distributed-Bragg-reflector surface-emitting laser with gain segments periodically placed on…”
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90 W CW red laser diode bar by Geels, R.S., Sakamoto, M., Welch, D.F.

“…We report 1 cm wide monolithic arrays of semiconductor laser diodes emitting output powers up to 90 W CW. Bars with lower fill factors were found to fail by…”
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AlGaInP red laser diodes by OMVPE by Bour, D.P., Treat, D.W., Bringans, R.D., Geels, R.S., Welch, D.F.

“…We summarize the growth and characterization of (AlGa)/sub 0.5/In/sub 0.5/P quantum well (QW) lasers, including the important issues of p-doping, optimized…”
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