A quantum dot laser is a semiconductor laser that uses quantum dots as the active laser medium in its light emitting region. Due to the tight confinement of charge carriers in quantum dots, they exhibit an electronic structure similar to atoms. Lasers fabricated from such an active media exhibit device performance that is closer to gas lasers, and avoid some of the negative aspects of device performance associated with traditional semiconductor lasers based on bulk or quantum well active media. Improvements in modulation bandwidth, lasing threshold, relative intensity noise, linewidth enhancement factor and temperature insensitivity have all been observed. The quantum dot active region may also be engineered to operate at different wavelengths by varying dot size and composition. This allows quantum dot lasers to be fabricated to operate at wavelengths previously not possible using semiconductor laser technology.
Recently, devices based on quantum dot active media are finding commercial application in medicine (laser scalpel, optical coherence tomography), display technologies (projection, laser TV), spectroscopy and telecommunications. A 10 Gbit/s quantum dot laser that is insensitive to temperature fluctuation for use in optical data communications and optical networks has been developed using this technology. The laser is capable of high-speed operation at 1.3 μm wavelengths, at temperatures from 20 °C to 70 °C. It works in optical data transmission systems, optical LANs and metro-access systems. In comparison to the performance of conventional strained quantum-well lasers of the past, the new quantum dot laser achieves significantly higher stability of temperature.
See also
List of laser articles
References
Fujitsu (September 10, 2004). Fujitsu, University of Tokyo Develop World's First 10Gbit/s Quantum Dot Laser Featuring Breakthrough Temperature-Independent Output. Press Release.
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Pin-Diode.svg Semiconductor lasers
Basic types
Laser diode (LD) Double heterostructure laser (DH) Separate confinement heterostructure laser (SCH) Distributed Bragg reflector laser (DBR) Distributed feedback laser (DFB) Quantum well laser Quantum dot laser Quantum cascade laser (QCL) External-cavity laser (ECL)
Hybrid types
Extended cavity diode laser Volume Bragg grating laser
Other Types
Vertical-cavity surface-emitting laser (VCSEL) Vertical-external-cavity surface-emitting-laser (VECSEL) Hybrid silicon laser Interband cascade laser (ICL) Semiconductor ring laser
Theory
Semiconductor laser theory Laser diode rate equations
Materials
Indium arsenide (InAs) Gallium arsenide (GaAs) List of semiconductor materials
Laser types: Solid-state
Semiconductor Dye Gas
Chemical Excimer Ion Metal Vapor
Display technology
Video displays
Past
generation
Eidophor Cathode-ray tube (CRT) Jumbotron Electroluminescent display (ELD) Plasma display panel (PDP)
ALiS
Current
generation
Quantum dot display (QLED) Organic light-emitting diode (OLED)
AMOLED Electronic paper
E Ink Gyricon Light emitting diode display (LED) Liquid-crystal display (LCD)
TFT
TN IPS LED Blue Phase Digital Light Processing (DLP) Liquid crystal on silicon (LCoS)
Next
generation
microLED Electroluminescent Quantum Dots (ELQD/QD-LED) Organic light-emitting transistor (OLET) Surface-conduction electron-emitter display (SED) Field emission display (FED) Laser TV
Quantum dot Liquid crystal MEMS display
IMoD TMOS Ferro liquid crystal display (FLCD) Thick-film dielectric electroluminescent technology (TDEL) Telescopic pixel display (TPD) Laser-powered phosphor display (LPD)
Non-video
Electromechanical
Flip-dot Split-flap Vane Eggcrate Fiber optic Nixie tube Vacuum fluorescent display (VFD) Light-emitting electrochemical cell (LEC) Lightguide display Dot-matrix display Seven-segment display (SSD) Nine-segment display Fourteen-segment display (FSD) Sixteen-segment display (SISD)
3D display
Stereoscopic Autostereoscopic Multiscopic Hologram
Holographic display Computer-generated holography Volumetric Fog display
Static media
Monoscope Movie projector Neon sign Slide projector Transparency Laser beam
Display capabilities
EDID
CEA-861 DisplayID Always on Display See-through display
Related articles
History of display technology Large-screen television technology Optimum HDTV viewing distance High-dynamic-range imaging (HDRI) Color Light Output Flexible display Comparison of CRT, LCD, Plasma, and OLED displays
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