laser diode

(redirected from Semiconductor lasers)
Also found in: Dictionary.

laser diode

[′lā·zər ¦dī‚ōd]

laser diode

A semiconductor-based laser used to generate analog signals or digital pulses for transmission through optical fibers. Both laser diodes and LEDs (light-emitting diodes) are used for this purpose, but the laser diode generates a smaller beam that is easier to couple with the smaller core of singlemode fibers. Laser diodes are designed to emit light either from their edge or their surface, the latter providing a circular beam that couples better with the round core of the fiber.

Laser diodes work on the same principle as the bigger gas lasers. They function as an optical oscillator by stimulating a chain reaction of photon emission inside a tiny chamber. In edge-emitting lasers, the semiconductor waver is cleaved, and the inherent properties of the semiconductor create reflective ends that may or may not be enhanced with additional reflective films. With vertical cavity surface emitting lasers (VCSELs), the reflectivity has to be added.

The most common semiconductors used in laser diodes are compounds based on gallium arsenide (750 to 900 nm in the infrared), indium gallium arsenide phosphide (1200 to 1700 nm in the infrared) and gallium nitride (near 400 nm in the blue). See laser and solid state laser.


Laser Diodes
Laser diodes such as these are all fabricated using semiconductor processes just like CPU and memory chips. Note that the VCSELs (vixels) produce a circular beam that couples well with a fiber.







A Tunable Laser Diode
Laser diodes also make great sensors. This laser diode from Jet Propulsion Labs is tunable to different frequencies in order to detect various gases both on this and other planets. (Image courtesy of JPL's Microdevices Laboratory; Robert M. Brown, photographer)
References in periodicals archive ?
Semiconductor lasers are also used in new manufacturing processes such as micromachining.
a semiconductor laser technology company that offer light sources for lidar and interior illumination products, in order to accelerate the adoption of lidar and driver monitoring technologies in advanced driver assistance systems, advanced technology supplier.
These lasers utilize semiconductor lasers as their pumping sources, and now direct diode lasers (DDLs), which use such semiconductor lasers directly for laser machining, have become a focus of attention as the next generation of laser machining light sources because they are compact, feature high-efficiency electro-optic conversion, and can be mass-produced at low costs.
There are high expectations that this newly-developed semiconductor laser system, which incorporates semiconductor diodes, can have a much wider range of future applications.
Semiconductor lasers typically require electrons and "holes" to generate light energy.
Rohm said it hopes to develop lamps that use less than one-10th of the electricity needed for florescent lights by using semiconductor lasers, which change electricity into light efficiently.
Chapter 7 looks into the future of semiconductor lasers and suggests areas of material and device improvements.
OTCBB:QPCI) "QPC," a world leader in the design and manufacture of high brightness, high power semiconductor lasers for the consumer, industrial, defense, and medical markets, today announced that it has been invited to present on the company's technology and its current and potential applications in LIDAR (light detection and ranging) and communications at the 2008 Material Research Society (MRS) Spring Meeting at 11:00 a.
Panasonic Corporation today announced that it has developed a blue-violet semiconductor laser operating at output power of 4.
Electronic and electrical engineers, materials scientists, physicists, and other contributors review efforts in various research laboratories to create semiconductor lasers that are progressively smaller, primarily for use in photonic and optoelectronic integrated circuits, where taking up less space and using less power are beneficial.
Constructed from disks only 5 micrometers in diameter and mounted in air on a pedestal, this double-decker microlaser is considerably smaller than the tiny semiconductor lasers that scan discs in compact-disc players.
Mode-locked semiconductor lasers are devices that produce short optical pulses in which the pulse width is limited only by the optical amplifier's bandwidth.

Full browser ?