Most Downloaded Journal Articles: last days    
Page 8 of 8:  Prev << 1 2 3 4 5 6 7 8    (177 Items)
1.  High-Power Continuous-Wave Operation of Quantum-Cascade Lasers Up to 60 °C
J.S. Yu, A. Evans, J. David, L. Doris, S. Slivken and M. Razeghi
IEEE Photonics Technology Letters, 16 (3)-- March 1, 2004 ...[Visit Journal]
High-temperature high-power continuous-wave (CW) operation of high-reflectivity-coated 12 μm wide quantum-cascade lasers emitting at λ = 6 μm with a thick electroplated Au top contact layer is reported for different cavity lengths. For a 3 mm long laser, the CW optical output powers of 381 mW at 293 K and 22 mW at maximum operating temperature of 333 K (60°C) are achieved with threshold current densities of 1.93 and 3.09 kA/cm2, respectively. At 298 K, the same cavity gives a maximum wall plug efficiency of 3.17% at 1.07 A. An even higher CW optical output power of 424 mW at 293 K is obtained for a 4-mm-long laser and the device also operates up to 332 K with an output power of 14 mW. Thermal resistance is also analyzed at threshold as a function of cavity length. [reprint (PDF)]
 
1.  Growth and characterization of InAs/GaSb photoconductors for long wavelength infrared range
H. Mohseni, E. Michel, J. Sandven, M. Razeghi, W. Mitchel, and G. Brown
Applied Physics Letters 71 (10)-- September 8, 1997 ...[Visit Journal]
In this letter we report the molecular beam epitaxial growth and characterization of InAs/GaSb superlattices grown on semi-insulating GaAs substrates for long wavelength infrared detectors. Photoconductive detectors fabricated from the superlattices showed photoresponse up to 12 µm and peak responsivity of 5.5 V/W with Johnson noise limited detectivity of 1.33 × 109 cm·Hz½/W at 10.3 µm at 78 K. [reprint (PDF)]
 
Page 8 of 8:  Prev << 1 2 3 4 5 6 7 8    (177 Items)
Center for Quantum Devices
ECE Department, McCormick School of Engineering, Northwestern University
 Address: Center for Quantum Devices; 2220 Campus Drive RM 4051; Evanston, IL 60208-0893
 Phone: (847) 491-7251
 Email: razeghi@northwestern.edu
© 2020 Center for Quantum Devices, Northwestern University  Disclaimer