TITLE

Quantum cascade lasers with voltage defect of less than one longitudinal optical phonon energy

AUTHOR(S)
Escarra, Matthew D.; Hoffman, Anthony J.; Franz, Kale J.; Howard, Scott S.; Cendejas, Richard; Xiaojun Wang; Jen-Yu Fan; Gmachl, Claire
PUB. DATE
June 2009
SOURCE
Applied Physics Letters;6/22/2009, Vol. 94 Issue 25, p251114
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 demonstrate a QC laser emitting at 4.2 μm featuring a low voltage defect and short injector with only four quantum wells. Devices with a voltage defect of 20 meV, well below the energy of the longitudinal optical phonons, and a voltage efficiency of 91%, a record value for QC lasers, are reported for pulsed operation at 180 K. Voltage efficiencies of greater than 80% are exhibited at room temperature. Overall performance showed wall-plug efficiencies ranging from 21% at cryogenic temperatures to 5.3% at room temperature.
ACCESSION #
42642388

 

Related Articles

  • Transverse photoeffect in PbI2 crystals under x-ray and laser excitation. Matviishyn, I.; Novosad, S.; Yaritska, L.; Novosad, I.; Futei, A. // Inorganic Materials;Sep2006, Vol. 42 Issue 9, p1034 

    Data are presented on the orientation and dose dependences and kinetics of the transverse photoemf (TPE) in rectangular samples cut from lead iodide crystals so that the angle between the normal to the face to be irradiated and the sixfold axis c is 0°, 45°, or 90°. The samples were...

  • Finite time of carrier energy relaxation as a cause of optical-power limitation in semiconductor lasers. Slipchenko, S. O.; Sokolova, Z. N.; Pikhtin, N. A.; Borschev, K. S.; Vinokurov, D. A.; Tarasov, I. S. // Semiconductors;Aug2006, Vol. 40 Issue 8, p990 

    It is shown that the reason why the maximum attainable optical power in semiconductor lasers is limited is the finite time of carrier energy relaxation via scattering by nonequilibrium optical phonons in the quantum-well active region. The power and spectral characteristics of semiconductor...

  • Role of thermal fluctuations in nondegenerate two-wave mixing. Rogovin, D.; McGraw, R.; Gavrielides, A. // Applied Physics Letters;11/6/1989, Vol. 55 Issue 19, p1937 

    The influence of thermal fluctuations on nondegenerate two-wave mixing in the nondepleted pump approximation is examined. For the specific case of an optical Kerr medium the spectrum of both amplitude and phase fluctuations as well as the signal-to-noise ratio are obtained. Detailed calculations...

  • Solitons and vortices in lasers. Weiss, C.O.; Vaupel, M.; Staliunas, K.; Slekys, G.; Taranenko, V.B. // Applied Physics B: Lasers & Optics;1999, Vol. 68 Issue 2, p151 

    Abstract. Nonlinear optical resonators, particularly active resonators, of large Fresnel number show a rich structure formation, which relates for example, lasers with fluids, superfluids, or chemical systems. "Localized structures" are structures of particular interest because of their...

  • Carrier-envelope offset phase control: A novel concept for absolute optical frequency measurement and ultrashort pulse generation. Telle, H.R.; Steinmeyer, G.; Dunlop, A.E.; Stenger, J.; Sutter, D.H.; Keller, U. // Applied Physics B: Lasers & Optics;1999, Vol. 69 Issue 4, p327 

    Abstract. The shortest pulses periodically emitted directly from a mode-locked Ti:sapphire laser are approaching the two-optical-cycle range. In this region, the phase of the optical carrier with respect to the pulse envelope becomes important in nonlinear optical processes such as high-harmonic...

  • Differential carrier lifetime in oxide-confined vertical cavity lasers obtained from electrical... Giudice, G.E.; Kuksenkov, D.V.; Temkin, H.; Lear, K.L. // Applied Physics Letters;2/15/1999, Vol. 74 Issue 7, p899 

    Evaluates differential carrier lifetime measurements performed on index-guided oxide-confined vertical cavity surface emitting lasers operating at 980 nm. Lifetimes extracted from laser impedance measurements at subthreshold currents with device size as a parameter using a small-signal model;...

  • VCSEL package design presents unique challenges. Wallace, John // Laser Focus World;Jun99, Vol. 35 Issue 6, p73 

    Describes vertical-cavity surface-emitting laser (VCSEL) which gives off light in a direction perpendicular to the semiconductor wafer on which it has been fabricated. Properties and applications of the VCSEL; Description of the array it emits; Description of the lateral alignment of the VCSEL...

  • Revised safety standards to benefit laser design and use. Tozer, Bryan A. // Laser Focus World;Mar2001, Vol. 37 Issue 3, p81 

    Provides information on the revision of the IEC 60825-1 on laser safety standards. Major changes to the laser-hazard classification system; Effect of the changes.

  • Wavelength tuning in spherical liquid dye lasers by controlling the cavity Q values. Taniguchi, Hiroshi; Tomisawa, Humihiro // Applied Physics Letters;12/26/1994, Vol. 65 Issue 26, p3305 

    Examines wavelength tuning for spherical liquid dye lasers. Control of the cavity Q value of dye lasers by polyspheres; Behavior of lasers in liquid droplets; Importance of microsphere dye lasers for nonlinear optical microdevices.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics