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Topic: Injection laser diode

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	Method and apparatus for efficient operation of optically pumped laser - Patent 4710940
		An optically pumped laser as defined in claim 1 wherein an array of laser diodes and said means for concentration is provided at both ends of said medium, and including a mirror for separating the output of said medium as an output beam from the pump distribution at one end of said medium.
		An optically pumped singlemode laser as defined in claim 6 wherein an array of multimode laser diode and concentration means is provided at both ends of said laser medium, and including a mirror at one end of said laser medium for separating the singlemode output of said laser medium as an output beam.
		Laser diode arrays 37 with focusing optics pump from the ends, while similar laser diode arrays 39 with focusing optics pump at the corners of the lasing beam path in the medium.
	www.freepatentsonline.com /4710940.html (3842 words)

	Dual feedback path linearization of galvanometer-scanned laser with a laser beam splitter housing assembly having beam ...
		The sealed unit is mounted in a module that effectively equalizes the cross-sectional spatial distribution of optical energy within the light beam emitted by the injection laser diode and ensures that the spatial cross-section of the image spot seen by the photodetector is effectively constant regardless of laser output beam intensity.
		In order to prevent the dual feedback loop from overdriving (and destroying) the injection laser diode, the first amplifier circuit includes a drive current control circuit which is operative to limit the level of drive current to the laser to a reduced level during the application of the blanking signal.
		To prevent the feedback path from overdriving the laser during a turn off condition, such as the blanking interval, the output 46 of summing amplifier 43 is coupled via the collector-emitter path of a unity gain bipolar NPN transistor 44 to the first input 41 of summing amplifier 43.
	www.freepatentsonline.com /5371360.html (4006 words)

	Laser Solutions - Melles Griot
		Laser diodes can be divided into two generic types depending on the method of confinement of the lasing mode in the lateral direction.
		Divergence angles for laser diodes in the direction perpendicular to the junction range as high as 60 degrees FWHM (full width at half maximum), typical values are in the 40 degree to 60 degree range.
		Furthermore, removing this material increases the working distance; all that is necessary is that the distance from the laser diode surface to the inside of the coverglass, plus the distance from the outside of the coverglass to the rear lens element, be the same as the original working distance (before modification).
	www.mellesgriot.com /products/lasers/lsrdiode.asp (2988 words)

	[No title] (Site not responding. Last check: 2007-11-03)
		The actual laser diode is mounted at the rear end of the aluminum block and the single element plastic lens is all that is needed to provide a reasonably well focused beam.
		If one surface of the diode is antireflection coated, then an external end mirror may be used and all types of dispersive elements inserted to reduce the laser bandwidth.
		Diodes made up from layers of different semiconductors, known as heterostructures, can overcome these natural limits by confining the light and the charge carriers to a defined region of the diode.
	www.lycos.com /info/diode--lasers.html (592 words)

	Laser Glossary Defines Technology
		Lasers mounted with thermoelectric coolers to stabilize the wavelength and energy by keeping the laser operating temperature stable.
		A new laser frequency for Oki is the 980 nm pump laser.
		A laser in which the injection of current into a semiconductor diode produces light by recombination of holes and electrons at the junction between p- and n-doped regions.
	docenti.ing.unipi.it /~d7384/com_ottiche/LaserGlossario.html (3747 words)

	What is a laser, what is a diode laser, what is a semiconductor
		Laser diodes differ from conventional lasers, such as the helium-neon (He-Ne), ruby, and gas types, in several ways.
		Some diodes are comprised of metal electrodes in a chamber evacuated or filled with a pure elemental gas at low pressure.
		Diodes of this type, with the application of a voltage at the correct level and the polarity, generate analog signals at microwave radio frequencies.
	www.photonics.uk.com /techinfo/laser_diodes_whatis.html (991 words)

	Glossary of Laser Terms
		Alignment: Laser alignment is a measure of the deviation of the optical axis of the laser beam with respect to the mechanical axis of the laser housing.
		Laser: Laser is an acronym for Light Amplification by Stimulated Emission of Radiation.
		Laser output power is measured in watts (W) or milliwatts (mW) for continuous wave laser operation.
	www.calpaclasers.com /glossary.html (537 words)

	Thinklasers.com - Learn - Laser Diode (Site not responding. Last check: 2007-11-03)
		A laser diode is a laser in which the medium is a semiconductor that converts electrical current into light.
		They are referred to as injection diodes, as to not confuse them with the common pumped diodes.
		The diode is formed by "doping" a very thin layer on the surface of the crystal.
	www.thinklasers.com /Learn_laserdiode.htm (280 words)

	Definition: injection laser diode (Site not responding. Last check: 2007-11-03)
		injection laser diode (ILD): A laser that uses a forward-biased semiconductor junction as the active medium.
		Note: Stimulated emission of coherent light occurs at a p-n junction where electrons and holes are driven into the junction.
		This HTML version of Telecom Glossary 2K was last generated on Wed May 8 15:36:48 MDT 2002.
	www.its.bldrdoc.gov /projects/devglossary/_injection_laser_diode.html (53 words)

	Laser Diode Structures
		We have designed a vertical cavity laser that is actually a ring laser (rather than a conventional Fabry-Perot laser), [8] which allows for coupling to adjacent devices as well as surface emission.
		This allows a small part of the beam from one laser to be injected into an adjacent laser, for injection locking.
		Laser diode arrays can be either coherent (all elements in phase, for applications in which beam quality is an issue) or incoherent (to get huge amounts of power out of a laser without blasting the facets off).
	www.ece.osu.edu /~anderson/lasdiodestructures.html (287 words)

	Neural network demonstrated using semiconductor laser modes
		The injection laser diode is configured to have an external cavity: everything between it and the mirror.
		Because the laser is being run near its threshold condition, its longitudinal modes are having to compete for the available energy.
		They also speculate on the possibility of integrating both the laser and external cavity on a single chip, using an optically addressed spatial light modulator to allow the output of a laser network to be input to another, and the possibility of manipulating a hundred laser modes in a single laser.
	www.spie.org /web/oer/march/mar97/ltconstr.html (888 words)

	lab2 (Site not responding. Last check: 2007-11-03)
		While the I-V curves of LEDs and Laser Diodes look quite similar since both are diodes, the PI curves do not since their emission mechanisms are different.
		To measure the current through the ILD, use the Laser Diode monitor output and the fact that the monitor voltage to current calibration is 70 mV/mA.
		You may measure this by measuring the widths of the beam parallel and perpendicular to the diode junction and using the distance from the diode.
	www.eg.bucknell.edu /~opto/lab2.html (1586 words)

	What is laser diode? - a definition from Whatis.com
		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.
		Wide-angle beam: A laser diode produces a "cone" rather than a "pencil" of visible light or IR, although this "cone" can be collimated using convex lenses.
	searchsmb.techtarget.com /sDefinition/0,,sid44_gci213532,00.html (295 words)

	[No title]
		Typical spectral widths are 20 to 60 nanometer for an LED and 2 to 5 nanometer for a laser diode.
		An LED or laser diode that emits light with a controlled and constant spectral width, central wavelength, and peak power with respect to time and temperature.
		An example is the radiation from an injection laser diode above the lasing threshold.
	www.bluebellcomms.co.uk /glossary/glossary_s.htm (615 words)

	Fiber Optics Glossary (Site not responding. Last check: 2007-11-03)
		Laser transmitters are usually designed with a compromise between switching speed and extinction ratio performance.
		A laser diode is an electro-optic device that produces coherent light with a narrow range of wavelengths, typically centered around 780 nm, 1310 nm, or 1550 nm.
		Lasers with wavelengths centered around 780 nm are commonly referred to as CD Lasers.
	www.infocellar.com /networks/fiber-optics/glossaries/glossary.htm (8997 words)

	ELCOMMTECH Corporation - Glossary \| Fiber Optic Transport Links and Modems for CCTV, Broadcast, Professional ... (Site not responding. Last check: 2007-11-03)
		The lowest excitation level at which a laser's output is dominated by stimulated emission rather that spontaneous emission.
		In the laser and optical communications field, the much broader portion of the electromagnetic spectrum that can be handled by the basic optical techniques used for the visible spectrum extending from the near-ultraviolet region of approximately 0.3 micrometers through the visible region and into the mid-infrared region to 30 micrometers.
		The dynamic process a multilongitudinal laser undergoes whereby the changing distribution of power among the modes creates a continuously changing envelope of the laser's spectrum.
	www.elcommtech.com /glossary.html (7967 words)

	Diode Laser Synopsis - University of Connecticut 3/2000
		The laser diode should be oriented so that the divergence angle is larger in the horizontal dimension - this way more lines on the grating will be filled, which should improve mode selection.
		The diode laser current should be fed into the laser enclosure with a BNC or SMA connector, and shielded coax cable (RG-316/U) should be used between this connector and a transistor socket, which can be plugged onto the laser itself.
		Laser injection current modulator - this section sends the higher frequency portion of the lock signal to the laser injection current.
	www.phys.uconn.edu /research/ultracold/gouldlab/diodes (6159 words)

	Glossary of Optical Networking Terms
		An injection laser diode constructed with a Bragg reflection grating outside the active region to suppress multiple longitudinal modes and enhance a single longitudinal mode.
		Forward laser control provides a means to quickly shut down a transmitting laser when such a receive signal failure occurs.
		Originally an acronym for light amplification by stimulated emission of radiation, laser is a light source that produces coherent, near monochromatic light.
	www.cisco.com /univercd/cc/td/doc/product/mels/ons_540/opt_gl.htm (3306 words)

	Oki Optical Components - Glossary
		In response to the many requests for explanations of Oki's laser and fiber optic technology, we have assembled this glossary.
		Light Amplification by Stimulated Emission of RadiationÐone of the wide range of devices that generates light by that principle.
		This document is not intended to plagiarize, publish or copy for profit and is issued solely for your information.
	www.okioptical.com /glossary.shtml (3783 words)

	The Diode Laser—the First Thirty Days Forty Years Ago
		Of course, the basic quantum mechanics behind the radiative recombination and laser operation of chromium ions in ruby and the earlier demonstration of the microwave amplification by the emission of radiation—i.e., the MASER—using ammonia molecules, were fundamentally different from that occurring in a direct-bandgap semiconductor.
		The first verification of laser operation was made through the observation of the near and far-field interference patterns using an infrared up converting “snooper scope” which was being used in Hall’s lab to study the emission from such infrared light emitters.
		Sometime after the successful operation of the first semiconductor lasers at the GE Schenectady Lab, Hall’s boss, Roy Apker, called Holonyak at Syracuse to tell him that Hall’s group was running a diode laser and suggested that he should stop trying to cleave facets.
	www.ieee.org /organizations/pubs/newsletters/leos/feb03/diode.html (4265 words)

	Diode laser update news
		Modern diodes aim for low dynamic resistance; from scanning the web, I expect a cutoff frequency of somewhere between 1kHz and 10kHz.
		I think this is probably because varying the injection current affects both the laser intensity and frequency, and our frequency reference (sat abs) does not properly discriminate between the two.
		Remaining problems: the dither signal is ac-coupled to the lockin board, and to the current injection, but both have different equilibrium potentials.
	optics.ph.unimelb.edu.au /atomopt/electronics/diode_news.html (1148 words)

	Single-element optical injection locking of diode-laser arrays (US4751705)
		By optically injecting a single end-element of a semiconductor laser array, both the spatial and spectral emission characteristics of the entire laser array is controlled.
		With the output of the array locked, the far-field emission angle of the array is continuously scanned over several degrees by varying the injection frequency.
		J. Hohimer et al., "Injection-Locking Diode Laser Arrays with a Stable Single-Mode CW Dye Laser", Optical Soc.
	www.delphion.com /details?pn10=US04751705 (489 words)

	Efficient Third Harmonic Conversion of Ti:Sapphire Laser Radiation
		In order to reduce the Ti:sapphire laser linewidth and increase harmonic conversion efficiency [2] we injection-seeded the laser using two external-grating diode lasers (EOSI, Inc) tuned to regions around 925 nm and 945 nm, respectively.
		The main parameters of the pump Nd:YLF laser and unseeded Ti:sapphire tunable oscillator are given in Table 1.
		While this effort emphasizes the ozone application with operation in the 308- to 320-nm region, the same approach could be applied for OH and SO sensing at 308 nm and 300 nm, respectively, as well for 290-nm excitation of biological species.
	www.qpeak.com /Papers/ASSL99thg/thgtisapphire.htm (1041 words)

	Heidelberg - Glossary - L
		Output device in which a light beam emitted by a laser light source is directed onto a photo-sensitive material via optics and/or mirrors.
		Single dots (spots) are produced by means of upstream on/off switches that are synchronized with the deflecting unit, the correlation of the spots is driven by a software program or a page description language as well as the laser imagesetter’s driver.
		The surface of the drum is first electrically charged, a beam of laser light then records the printing information on the drum line by line by means of a rotating mirror wheel.
	www.heidelberg.com /www/html/en/glossary/glossaryitems/L (1382 words)

	Physics News Graphics: Laser Diode (Site not responding. Last check: 2007-11-03)
		In late 1962, four independent groups succeeded in making a semiconductor or "diode" laser, the type of laser which is now used in DVD players, compact disk players, barcode scanners and fiber optic communications.
		The above image is an example of a blue laser at the University of California at Santa Barbera, one of the many research groups that have worked on blue lasers.
		Within the decade, blue lasers might replace the red lasers in DVD players, enabling a six-fold increase in information storage on the same-sized disk.
	www.aip.org /mgr/png/2002/164.htm (192 words)

	Telecom Dictionary O: Phone Service Definitions
		Note: The resonator in a laser is an optical cavity.
		Note 2: The amount of optical power launched into a given fiber by a given transmitter depends on the nature of its active optical source (LED or laser diode) and the type of fiber, including such parameters as core diameter and numerical aperture.
		Note 1: Photodiodes, LEDs, injection laser diodes, and integrated optical circuit (IOC) elements are examples of opto-electronic devices commonly used in optical fiber communications.
	www.higginsinternational.com /Definitions/telecom_dictionary_o.html (10082 words)

	FDDI: Fiber Distributed Data Interface (Site not responding. Last check: 2007-11-03)
		Multimode fiber uses a light emitting diode (LED) to generate multiple light pulses which enter and travel the fiber at different angles.
		Single-mode fiber uses an injection laser diode (ILD) to generate a single pulse of light through the fiber, eliminating the effects of modal dispersion.
		The lower error rate for single-mode fiber allows for higher data rates and longer runs than with multimode fiber.
	scatcat.fhsu.edu /~rbchapin/fddi/pages/media.html (217 words)

	Fiber Optic Glossary: M (Site not responding. Last check: 2007-11-03)
		undergoes whereby the changing distribution of power among the modes creates a continuously changing envelope of the laser's spectrum.
		A laser structure with a very thin (about 10 nm thick) layer of bulk semiconductor material sandwiched between the two barrier regions of a higher bandgap material.
		This restricts the motion of the electrons and holes and forces energies for motion to be quantized and only occur at discrete energies.
	www.mrfiber.com /glossary-m.htm (795 words)

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