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Page 8 of 8: Prev << 1 2 3 4 5 6 7 8 (177 Items)
| 1. | High-power, continuous-wave, phase-locked quantum cascade laser arrays emitting at 8 μm
WENJIA ZHOU,QUAN-YONG LU,DONG-HAI WU, STEVEN SLIVKEN, AND MANIJEH RAZEGHI
OPTICS EXPRESS 27, 15776-15785-- May 20, 2019 ...[Visit Journal]
We report a room-temperature eight-element phase-locked quantum cascade laser
array emitting at 8 μm with a high continuous-wave power of 8.2 W and wall plug efficiency
of 9.5%. The laser array operates primarily via the in-phase supermode and has single-mode
emission with a side-mode suppression ratio of ~20 dB. The quantum cascade laser active
region is based on a high differential gain (8.7 cm/kA) and low voltage defect (90 meV)
design. A record high wall plug efficiency of 20.4% is achieved from a low loss buried ridge
type single-element Fabry-Perot laser operating in pulsed mode at 20 °C. [reprint (PDF)]
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| 1. | Type–II superlattices base visible/extended short–wavelength infrared photodetectors with a bandstructure–engineered photo–generated carrier extractor
Arash Dehzangi, Ryan McClintock, Abbas Haddadi, Donghai Wu, Romain Chevallier, Manijeh Razeghi
Scientific Reports volume 9, Article number: 5003 -- March 21, 2019 ...[Visit Journal]
Visible/extended short–wavelength infrared photodetectors with a bandstructure–engineered photo–generated carrier extractor based on type–II InAs/AlSb/GaSb superlattices have been demonstrated. The photodetectors are designed to have a 100% cut-off wavelength of ~2.4 μm at 300K, with sensitivity down to visible wavelengths. The photodetectors exhibit room–temperature (300K) peak responsivity of 0.6 A/W at ~1.7 μm, corresponding to a quantum efficiency of 43% at zero bias under front–side illumination, without any anti–reflection coating where the visible cut−on wavelength of the devices is <0.5 µm. With a dark current density of 5.3 × 10−4 A/cm² under −20 mV applied bias at 300K, the photodetectors exhibit a specific detectivity of 4.72 × 1010 cm·Hz½W-1. At 150K, the photodetectors exhibit a dark current density of 1.8 × 10−10 A/cm² and a quantum efficiency of 40%, resulting in a detectivity of 5.56 × 1013 cm·Hz½/W [reprint (PDF)]
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Page 8 of 8: Prev << 1 2 3 4 5 6 7 8 (177 Items)
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Address: Center for Quantum Devices; 2220 Campus Drive RM 4051; Evanston, IL 60208-0893
Phone: (847) 491-7251
Email: razeghi@northwestern.edu