Search Results - "Franz, Kale J"

Highly power-efficient quantum cascade lasers by Liu, Peter Q, Hoffman, Anthony J, Escarra, Matthew D, Franz, Kale J, Khurgin, Jacob B, Dikmelik, Yamac, Wang, Xiaojun, Fan, Jen-Yu, Gmachl, Claire F

“…Quantum cascade lasers 1 are promising mid-infrared semiconductor light sources for molecular detection in applications such as environmental sensing or…”
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Negative refraction in semiconductor metamaterials by Hoffman, Anthony J, Alekseyev, Leonid, Howard, Scott S, Franz, Kale J, Wasserman, Dan, Podolskiy, Viktor A, Narimanov, Evgenii E, Sivco, Deborah L, Gmachl, Claire

“…An optical metamaterial is a composite in which subwavelength features, rather than the constituent materials, control the macroscopic electromagnetic…”
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High k -space lasing in a dual-wavelength quantum cascade laser by Franz, Kale J, Menzel, Stefan, Hoffman, Anthony J, Wasserman, Dan, Cockburn, John W, Gmachl, Claire

“…The understanding of charge carrier distributions is fundamental to our knowledge of laser systems. In semiconductor lasers, because of the propensity of…”
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Low voltage-defect quantum cascade laser with heterogeneous injector regions by Hoffman, Anthony J, Schartner, Stephan, Howard, Scott S, Franz, Kale J, Towner, Fred, Gmachl, Claire

“…We demonstrate an In(0.635)Al(0.356)As/In(0.678)Ga(0.322)As strain compensated quantum cascade laser that employs heterogeneous injector regions for low…”
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Voltage Tunability of Quantum Cascade Lasers by Yao, Yu, Liu, Zhijun, Hoffman, Anthony J., Franz, Kale J., Gmachl, Claire F.

“…The voltage tunability of three types of quantum cascade laser designs is investigated. The tuning coefficients and tuning ranges of electroluminescence and…”
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Short Injector Quantum Cascade Lasers by Franz, K.J., Liu, P.Q., Raftery, J., Escarra, M.D., Hoffman, A.J., Howard, S.S., Yu Yao, Dikmelik, Y., Xiaojun Wang, Jen-Yu Fan, Khurgin, J.B., Gmachl, C.

“…We report our study on the effects of shortened quantum cascade (QC) laser injector regions. While conventional short-wavelength QC lasers typically have…”
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Evidence of cascaded emission in a dual-wavelength quantum cascade laser by Franz, Kale J., Wasserman, Daniel, Hoffman, Anthony J., Jangraw, David C., Shiu, Kuen-Ting, Forrest, Stephen R., Gmachl, Claire

“…This letter reports on a quantum cascade laser that exhibits simultaneous dual-wavelength emission from two consecutive optical transitions in each active…”
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High-power laterally coupled distributed-feedback GaSb-based diode lasers at 2 μ m wavelength by Forouhar, Siamak, Briggs, Ryan M., Frez, Clifford, Franz, Kale J., Ksendzov, Alexander

“…We report on GaSb-based laterally coupled distributed-feedback (DFB) diode lasers designed to operate at wavelengths near 2.05 μ m. Second-order Bragg gratings…”
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Role of interface roughness in the transport and lasing characteristics of quantum-cascade lasers by Khurgin, Jacob B., Dikmelik, Yamac, Liu, Peter Q., Hoffman, Anthony J., Escarra, Matthew D., Franz, Kale J., Gmachl, Claire F.

“…A density-matrix based theory of transport and lasing in quantum-cascade lasers reveals that large disparity between luminescent linewidth and broadening of…”
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Room temperature and narrow intersubband electroluminescence from ZnCdSe/ZnCdMgSe quantum cascade laser structures by Yao, Yu, Alfaro-Martinez, Adrian, Franz, Kale J., Charles, William O., Shen, Aidong, Tamargo, Maria C., Gmachl, Claire F.

“…We report ZnCdSe/ZnCdMgSe Quantum Cascade structures with "two-phonon" and "bound-to-continuum" active region designs. The electroluminescence shows more than…”
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High dynamic range laser dispersion spectroscopy of saturated absorption lines by Franz, Kale J, Weidmann, Damien, Wysocki, Gerard

“…A spectroscopic detection of molecular dispersion based on frequency-chirped laser is presented. Unlike non-linear direct absorption methods yielding line…”
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A widely voltage-tunable quantum cascade laser based on "two-step" coupling by Yao, Yu, Franz, Kale J., Wang, Xiaojun, Fan, Jen-Yu, Gmachl, Claire

“…A novel quantum cascade laser design with "two-step" coupling between the injector and the upper laser state is demonstrated to achieve a widely…”
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Quantum cascade lasers with voltage defect of less than one longitudinal optical phonon energy by Escarra, Matthew D., Hoffman, Anthony J., Franz, Kale J., Howard, Scott S., Cendejas, Richard, Wang, Xiaojun, Fan, Jen-Yu, Gmachl, Claire

“…Efficient use of applied voltage in quantum cascade (QC) lasers is a critical factor in achieving high wall-plug efficiency and low compliance voltage. We…”
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Limitations to the power output and efficiency of mid-Infrared quantum cascade lasers imposed by transport by Dikmelik, Yamac, Khurgin, Jacob B, Liu, Peter Q, Escarra, Matthew D, Hoffman, Anthony J, Franz, Kale J, Gmachl, Claire F

“…We use a density-matrix framework to evaluate the wallplug efficiency of mid-infrared quantum cascade lasers. We assess the limitations to maximum current and…”
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Improvement on the luminescence efficiency, electroluminescence linewidth and transport properties of ZnCdSe/ZnCdMgSe Quantum Cascade structures by Yu Yao, Charles, William O, Franz, Kale J, Aidong Shen, Tamargo, Maria C, Gmachl, Claire F

“…We present electroluminescence from ZnCdSe/ZnCdMgSe Quantum Cascade structures, with 3 times higher luminescence efficiency, 30% narrower electroluminescence…”
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Wavelength selection for quantum cascade lasers by cavity length by Young, Christina, Cendejas, Richard, Howard, Scott S., Sanchez-Vaynshteyn, Wendy, Hoffman, Anthony J., Franz, Kale J., Yao, Yu, Mizaikoff, Boris, Wang, Xiaojun, Fan, Jenyu, Gmachl, Claire F.

“…A systematic shift in spectral emission wavenumbers in quantum cascade lasers (QCLs) is observed over a variation in cavity lengths from 0.5 to 3 mm resulting…”
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Role of interface roughness in the transport and lasing characteristicsof quantum-cascade lasers by Khurgin, Jacob B., Dikmelik, Yamac, Liu, Peter Q., Hoffman, Anthony J., Escarra, Matthew D., Franz, Kale J., Gmachl, Claire F.

“…A density-matrix based theory of transport and lasing in quantum-cascade lasers reveals that large disparity between luminescent linewidth and broadening of…”
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Zn Cd Se ∕ Zn Cd Mg Se quantum cascade electroluminescence by Franz, Kale J., Charles, William O., Shen, Aidong, Hoffman, Anthony J., Tamargo, Maria C., Gmachl, Claire

“…This letter reports electroluminescence emission from a Zn Cd Se ∕ Zn Cd Mg Se quantum cascade (QC) structure. With a two-well QC active region design, the…”
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Lasing-induced reduction in core heating in high wall plug efficiency quantum cascade lasers by Hoffman, Anthony J., Braun, Phillip X., Escarra, Matthew D., Howard, Scott S., Franz, Kale J., Wang, Xiaojun, Fan, Jenyu, Gmachl, Claire

“…Quantum cascade (QC) laser core heating is a primary impediment to high device wall plug efficiency (WPE). Here, we demonstrate that efficient photon…”
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Laterally coupled distributed-feedback GaSb-based diode lasers for atmospheric gas detection at 2 μm by Briggs, R. M., Frez, C., Ksendzov, A., Franz, K. J., Bagheri, M., Forouhar, S.

“…We demonstrate single-mode laterally coupled distributed-feedback diode lasers at 2.05 μm employing low-loss etched gratings. Single-facet CW output exceeds 50…”
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