Quantum dot laser

Quantum dot laser

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.

References

* Fujitsu (September 10, 2004). " [http://www.fujitsu.com/news/pr/archives/month/2004/20040910-01.html Fujitsu, University of Tokyo Develop World's First 10Gbit/s Quantum Dot Laser Featuring Breakthrough Temperature-Independent Output] ". Press Release.


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Quantum dot — Part of a series of articles on Nanomaterials Fullerenes …   Wikipedia

  • Quantum dot display — A quantum dot display is a type of display technology used in flat panel displays as an electronic visual display. Quantum dots (QD) or semiconductor nanocrystals are a form of light emitting technology and consist of nano scale crystals that can …   Wikipedia

  • Quantum dot — Point quantique Vue idéalisé d un quantum dot pyramidal d arséniure d indium (InAs) sur de l arséniure de gallium (GaAs) Un point quantique appelée aussi boite quantique ou encore par son appellation anglophone quantum dot est un nanocristal de… …   Wikipédia en Français

  • Quantum dot — Ein Quantenpunkt (engl. quantum dot) ist eine nanoskopische Materialstruktur, meist aus Halbleitermaterial (z. B. InGaAs, CdSe oder auch GaInP/InP). Ladungsträger (Elektronen, Löcher) in einem Quantenpunkt sind in ihrer Beweglichkeit in allen… …   Deutsch Wikipedia

  • Láser de punto cuántico — Un láser de punto cuántico es un láser semiconductor que usa puntos cuánticos como el medio activo en su región de emisión de luz. Debido al apretado confinamiento de los portadores de carga en los puntos cuánticos, exhiben una estructura… …   Wikipedia Español

  • Quantum heterostructure — is a heterostructure in a substrate (usually a semiconductor material), with size restricting the movements of the charge carriers and forcing them into a quantum confinement, leading to formation of a set of discrete energy levels at which the… …   Wikipedia

  • Quantum well — A quantum well is a potential well with only discrete energy values. One technology to create quantization is to confine particles, which were originally free to move in three dimensions, to two dimensions, forcing them to occupy a planar region …   Wikipedia

  • Quantum mechanics — For a generally accessible and less technical introduction to the topic, see Introduction to quantum mechanics. Quantum mechanics …   Wikipedia

  • Timeline of quantum computing — Timeline of quantum computers1970s* 1970 Stephen Wiesner invents conjugate coding.* 1973 Alexander Holevo publishes a paper showing that n qubits cannot carry more than n classical bits of information (a result known as Holevo s theorem or Holevo …   Wikipedia

  • Blue laser — The term blue laser is frequently applied to semiconductor laser diode based on gallium nitride. These new devices have applications in many areas ranging from optoelectronic data storage at high density to medical applications. Thanks to prior… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”