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Topic: Laser diode


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  Laser diode - Wikipedia, the free encyclopedia
A laser diode is a laser where the active medium is a semiconductor similar to that found in a light-emitting diode.
The efficiency of a quantum well laser is greater than that of a bulk laser because the density of states function of electrons in the quantum well system has an abrupt edge that concentrates electrons in energy states that contribute to laser action.
Laser diodes are numerically the most common type of laser, with 2004 sales of approximately 733 million diode lasers (Steele 2005), as compared to 131,000 of other types of lasers (Kincade and Anderson 2005).
en.wikipedia.org /wiki/Laser_diode   (1920 words)

  
 [No title]
Laser pointers and diode laser modules - the low stress approach: ---------------------------------------------------------------- Where what you really want is a working visible diode laser, a commercial laser pointer or diode laser module may be the best option.
Laser drivers (1) to (3) were from CW laser lights used for positioning in medical applications while (4) was from a UPC bar code scanner.
Laser diode power supply 2: -------------------------- This one, from the same manufacturer as the one described in the section: "Laser diode power supply 1", seems to be an improved design including a soft-start (ramp-up) circuit and an inductor in series with the laser diode.
www.geocities.com /CapeCanaveral/Lab/3931/laserdps.htm   (5671 words)

  
 Encyclopedia of Laser Physics and Technology - laser diodes, diode lasers, semiconductor
Laser diodes (= diode lasers) are semiconductor lasers in which the gain is generated by an electrical current flowing through a p-n junction.
Laser diodes are normally built as edge-emitting lasers, where the laser cavity is formed by coated or uncoated end facets (cleaved edges) of the semiconductor wafer.
As the light emitted by a laser diode is in basically all cases linearly polarized, it is possible to combine the outputs of two laser diodes with a polarizing beam splitter, so that an unpolarized beam with twice the power of a single diode but the same beam quality can be obtained (→ polarization multiplexing).
www.rp-photonics.com /laser_diodes.html   (626 words)

  
 Reference.com/Encyclopedia/Laser diode
The efficiency of a quantum well laser is greater than that of a bulk laser due to a tailoring of the distribution of electrons and holes that are involved in the stimulated emission (light producing) process.
VCSELs are semiconductor lasers that emit light perpendicular to the chip surface, contrary to conventional diode lasers that are edge-emitting (in-plane) devices.
Before the development of reliable laser diodes, small helium-neon lasers were used in CD players and barcode scanners.
www.reference.com /browse/wiki/Laser_diode   (1383 words)

  
 Define laser diode - a Whatis.com definition   (Site not responding. Last check: 2007-11-07)
A laser diode, also known as an injection laser or diode laser, is a semiconductor device that produces coherent radiation (in which the waves are all at the same frequency and phase) in the visible or infrared (IR) spectrum when current passes through it.
Laser diodes are used in optical fiber systems, compact disc (CD) players, laser printers, remote-control devices, and intrusion detection systems.
Laser diodes differ from conventional lasers, such as the helium-neon (He-Ne), ruby, and gas types, in several ways.
whatis.techtarget.com /definition/0,,sid9_gci213532,00.html   (269 words)

  
 Sam's Laser FAQ - Diode Lasers   (Site not responding. Last check: 2007-11-07)
Electrical input to the laser diode may be provided by a special current controlled DC power supply or from a driver which may modulate or pulse it at potentially very high data rates for use in fiber optic or free-space communications.
The main beam as it emerges from the laser diode is wedge shaped and highly divergent (unlike a helium-neon laser) with a typical spread of 10 by 30 degrees.
There are two temperature tuning rates for a diode laser, one is the tuning of a given longitudinal mode with temperature and the other is the tuning over larger temperature changes where the lasing mode hope from longitudinal mode to longitudinal mode to be close to the peak of the gain curve.
repairfaq.ece.drexel.edu /sam/laserdio.htm   (20316 words)

  
 Sam's Laser FAQ - Diode Laser Power Supplies   (Site not responding. Last check: 2007-11-07)
Laser diodes have been around for a good few years now, and I thought it was fairly widely known how you make them go and (harder) keep going for a long time; but there have been several postings recently from folk who are busy making themselves poorer by driving lasers inappropriately.
Laser drivers (1) to (3) were from CW laser lights used for positioning in medical applications.
The actual laser driver portion of circuits (1) to (3) as well as the one presented in the section: Sam's Laser Diode Driver (SG-LD1) is very similar to the basic design provided in a Toshiba application note named something like: "Example Driving Circuit for TOLD92xx Series Visible Laser Diodes".
www.eio.com /repairfaq/sam/laserdps.htm   (6918 words)

  
 Coherent Inc. : Manufacturer of Lasers : World Leader in Photonics
The newest Sapphireâ„¢ laser from Coherent is a small-footprint OEM laser delivering 50 mW (CW) of output power at 488 nm primarily intended for biomedical instrumentation, such as flow cytometry, drug discovery, genetic screening and confocal microscopy.
Terahertz gas laser is used by NASA to measure the depletion of the ozone layer.
Compass lasers are used to image the printing plates that are used to print many of the nations newspapers.
www.cohr.com   (1226 words)

  
 SANYO > Laser Diode   (Site not responding. Last check: 2007-11-07)
The term laser is an acronym that stands for "Light Amplification by Stimulated Emission of Radiation".
With unique structures developed by SANYO, providing the following features, these laser diodes are highly rated in a broad range of applications including compact discs, CD-R/RW, DVD systems, bar code scanners, laser pointers and printers.
SANYO laser diodes are also compatible with multimedia and other new optical equipment on which advanced information societies in future depend.
www.sanyo.com /semiconductors/laser_diode   (174 words)

  
 Laser Diode Drivers
A laser diode driver is required for all DPSS green lasers.
These drive circuits are designed for laser diodes requiring 100mA to 1500mA.
The laser diode current can be monitored with a voltmeter using test pins on the circuit board.
www.midwest-laser.com /html/laser_diode_drivers.html   (131 words)

  
 LASER POINTER / DIODE HOLOGRAPHY
A successful 8 x 10-inch hologram using a $7.99 laser pointer.
A beautiful hologram using an overhead reference beam with the $7.99 laser pointer.
Moving up in power from the laser pointer to a 10mW diode module.
www.holoworld.com /holo/diode.html   (252 words)

  
 Laser Diode Incorporated
Laser Diode Incorporated (LDI), founded in 1967, produces advanced optoelectronic products of the highest quality for the telecommunications, data communications, broadband access, industrial, aerospace, test and measurement, medical and defense industries.
We are ready to serve your optoelectronics needs.
Tyco Electronics and Laser Diode Incorporated's combined resources offer the greatest value and easiest path to your product solutions.
www.laserdiode.com   (137 words)

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