diode laser

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diode laser

[′dī‚ōd ‚lāz·ər]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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)
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References in periodicals archive ?
The TDLS8100 joins a lineup that includes the TDLS8000 tunable diode laser spectrometer for high-temperature and high-pressure gas concentration measurement applications, and is intended for use in the measurement of flowing gases where there is a need to reduce installation costs.
The fourth patient with congenital glaucoma did not achieve a successful outcome after the third diode laser application.
The method of using a diode laser for treating BPH includes diode laser enucleation of the prostate (DiLEP) and diode laser vaporization of the prostate.
Katz and his associates examined the use of a noninvasive 1,060-nm diode laser (SculpSure) in 10 subjects with moderate to severe hyperhidrosis of the axilla, defined as having Hyperhidrosis Disease Severity Scale (HDSS) scores of 3 or 4.
Our present case report reveals knowledge about using diode laser for the treatment of mucocele with a variety of beneficial effects such as minimal anesthesia, less procedural timings, good surgical site visualization, hemostasis, and minimal carbonization in 45 days of periodical follow-up.
A head-mounted 808 nm diode laser (DC-3300, Nidek Co., Ltd., Japan) through an indirect delivery system (Keeler Ophthalmic instruments, UK) and a wide-field aspheric handheld condensing lens (MaxField 28D, Ocular Instruments Inc., WA, USA) were used in all treatments.
Professor Marshall led the development of lasers for ophthalmic surgery, inventing and patenting the Excimer laser and the first diode laser for eye conditions linked to diabetes, glaucoma and ageing.
Head, Department of Urology CMC Hospital Professor Dr Malak Hussain Jalbani told media that the facility of Diode Laser Machine is available only in private sector including Aga Khan Hospital, SIUT