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Topic: Laser diode rate equations

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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.
		A laser diode, like many other semiconductor devices, is formed by doping a very thin layer on the surface of a crystal wafer.
		In the simplest form of laser diode, an optical waveguide is made on that crystal surface, such that the light is confined to a relatively narrow line.
	www.wikipedia.org /wiki/Laser_diode (1782 words)

	Encyclopedia: Laser diode (Site not responding. Last check: 2007-10-10)
		The VCSEL (Vertical-Cavity Surface-Emitting Laser [vɪxl]) is a type of semiconductor laser with laser beam emission perpendicular to the chip surface, contrary to conventional edge-emitting semiconductor lasers (also in-plane lasers) where laser light is emitted at one or two edges.
		Laser diodes are used in industrial applications such as heat treating, cladding, and seam welding.
		Lasers The semiconductor laser multimode rate equations relate photon and carrier (electron) numbers or densities, to device parameters such as carrier and photon lifetime, optical gain, injection current and other material parameters.
	www.nationmaster.com /encyclopedia/Laser-diode (2840 words)

	Laser diode - Encyclopedia, History, Geography and Biography
		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.
		To stabilize the lasing wavelength, a diffraction grating is etched close to the p-n junction of the diode.
		Before the development of reliable laser diodes, small helium-neon lasers were used in CD players and barcode scanners.
	www.arikah.com /encyclopedia/Laser_diode (1424 words)

	Laser diode -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-10)
		When a (A semiconductor that consists of a p-n junction) diode is forward biased, (An opening deliberately made in or through something) holes from the p-region are injected into the n-region, and (An elementary particle with negative charge) electrons from the n-region are injected into the p-region.
		This is called (additional info and facts about spontaneous emission) spontaneous emission, and is the main source of light in a (Diode such that light emitted at a p-n junction is proportional to the bias current; color depends on the material used) light-emitting diode.
		See also (additional info and facts about Laser diode rate equations) Laser diode rate equations, (Optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam) Collimator
	www.absoluteastronomy.com /encyclopedia/l/la/laser_diode.htm (1434 words)

	Laser diode (Site not responding. Last check: 2007-10-10)
		Laser diodes are sometimes referred to(somewhat redundantly) as injection laser diodes or by the acronyms LD or ILD.
		In a laser diode, the semiconductor crystal is fashioned into a shape somewhat like a piece of A4 paper—very thin in onedirection and rectangular in the other two.
		VCSELs are semiconductor lasers that emit light perpendicular to the chip surface,contrary to conventional diode lasers that are edge-emitting (in-plane) devices.
	www.therfcc.org /laser-diode-45805.html (649 words)

	Semiconductor laser diode - US Patent 5619518 (Site not responding. Last check: 2007-10-10)
		A semiconductor laser diode according to claim 1, wherein the superlattice in the first clad layer is adjacent with the active layer.
		A semiconductor laser diode according to claim 4 or 11, wherein the superlattice in the second clad layer is adjacent with the active layer.
		A semiconductor laser diode according to claim 9, wherein the composition of the first optical guide layer, the second optical guide layer or the first and the second guide layers is changed continuously, intermittently or continuously and intermittently to form a light confining structure.
	www.patentstorm.us /patents/5619518.html (4736 words)

	Semiconductor laser diode - US Patent 6668001 (Site not responding. Last check: 2007-10-10)
		The semiconductor laser device as defined in claim 1, wherein a compound semiconductor layer different from a compound semiconductor layer of the resonator structure is formed on the second facet.
		One method for preventing spatial hole-burning is to increase the width of the active region of the laser diode to lower the optical density at the output facet.
		A first prototype semiconductor laser diode including a linear section having a length of 0.8 mm was fabricated for evaluation of the suppression of the spatial hole-burning by the flared structure.
	www.patentstorm.us /patents/6668001.html (4483 words)

	diode
		Diodes are sometimes known as rectifiers for their use to rectify alternating current electricity into direct current, by removing the negative portion of the current.
		A special arrangement of four diodes that will transform an alternating current into a direct current, using both phases of the alternating current, is known as a diode bridge, or single-phase bridge rectifier.
		The first diodes were vacuum tube devices (also known as thermionic valves), arrangements of electrodes surrounded by a vacuum within a glass envelope, similar in appearance to incandescent light bulbs.
	www.fact-library.com /diode.html (1319 words)

	Laser diode (Site not responding. Last check: 2007-10-10)
		The 9xxnm 120W CW multimode laser diode bar, developed at the Bookham facility in...
		Due to ubiquitous diffraction, the laser light leaving the diode from the thin active region will undergo a Fourier transform of intensity very quickly, and will need a collimating lens to mae the light a beam.
		Because the device is, after all, based on a tiny p-n junction, the diode will be extremely sensitive to fluctuations in power, often changing wavelengths.
	hallencyclopedia.com /Laser_diode (1127 words)

	Optical transmission system comprising a laser diode - Patent 5526164
		When the characteristic line of the laser diode becomes flatter, the bias current is additionally increased, so that despite a shift of the threshold current to higher laser diode currents with ageing of the laser diode, the bias current continues to be larger than the threshold current.
		The mean value of the laser diode current, which corresponds to the laser diode current at the operating point on the characteristic line of the laser diode, cannot be derived directly from the photocurrent generated by the photodiode operating as a monitor diode.
		To avoid a mutilation of the data signal of the laser diode by the superimposed pilot signal and a consequent loss of data, it is necessary that the amplitude of the pilot signal be substantially smaller than the amplitude of the data signal.
	www.freepatentsonline.com /5526164.html (4998 words)

	PHOTONICS RESEARCH GROUP HOME PAGE : Publications - B.S. Thesis (Site not responding. Last check: 2007-10-10)
		The dye laser was found to have a tuning range of approximately 33 nm, from 564 nm to 597 nm, with a spectral width of 10 nm.
		Laser output energy and efficiency was found t0o increase in the absence of the UV illumination of the lasing medium.
		Laser tube B with an inner diameter of 7 mm and an electrode-to-electrode distance of 0.8 m operates at a higher pressure of 21-23 torr.
	www.upd.edu.ph /~nip/photonics/publications/bsthesis.htm (3462 words)

	Laser diode (Site not responding. Last check: 2007-10-10)
		In a laser diode, the semiconductor crystal is fashioned into a shape somewhat like a piece of A4 paper—very thin in one direction and rectangular in the other two.
		Laser diodes discussed to this point have the disadvantage of emitting light through the thin crystal edge.
		The reason this technique is only a recent development is that it is very difficult to give the top and bottom of the crystal a sufficiently high reflectivity.
	www.portaljuice.com /laser_diode.html (755 words)

	Laser modulation
		It is well known that the output power of a diode laser exhibits oscillations under strong current modulation.
		When the frequency of the driving signals reaches the GHz region (as is the case for high speed DVD recording) the relaxation oscillations have an effect on the actual shape of the optical pulse, and hence may influence the write performance of the recording system.
		Depending on the type of laser diode and on bias and operating conditions, this turn-on time may vary from several 100 picoseconds to several nanoseconds.
	molphys.leidenuniv.nl /~thooft/laserweb/download/laser_modulation.htm (354 words)

	WIAS-TeSCA simulations of laser diodes
		The static and dynamic performance of laser diodes is analyzed on the basis of different models.
		The electronic processes are described by continuity equations for electrons and holes, and a Poisson equation for the electrostatic potential (drift-diffusion model).
		Thermodynamic behavior is modeled by a heat flow equation for the device temperature (or equivalently by balance equations for the density of the entropy or the internal energy), [1].
	www.wias-berlin.de /publications/annual_reports/2003/node26.html (500 words)

	Laser diode rate equations
		The semiconductor laser multimode rate equations relate photon and carrier (electron) numbers or densities, to device parameters such as carrier and photon lifetime, optical gain, injection current and other material parameters.
		From these equations, it is possible to derive a set of steady state and small signal equations to help in further understanding the static and dynamic characteristics of semiconductor lasers.
		To account for gain compression due to the high power densities in semiconductor lasers, the gain equation is modified such that it becomes related to the inverse of the optical power.
	www.sciencedaily.com /encyclopedia/laser_diode_rate_equations (621 words)

	Optical injection locking of solid-state oscillators by frequency-multiplexed injection-locked, laser diodes - Patent ...
		The output optical beam from this master laser 10 is then split in a beam splitter 12, and a first beam is applied via path 14 to a first slave laser 20 to frequency and phase lock that slave laser 20 to one of the harmonics of the master laser.
		The conditions for this locking bandwidth mechanism are as follows: ##EQU1## In the foregoing equations, Q.sub.m is the external cavity Q of the resonant circuit, P.sub.i is the injection power from the master oscillator, P.sub.o is the free-running power from the slave oscillator, f.sub.m is the master oscillator frequency.
		The result of the application of the combined beams from the slave lasers is a coherent mixing which produces a photo current in the oscillator circuit at the beat frequency of the two slave lasers.
	www.freepatentsonline.com /4503403.html (2838 words)

	High-Speed Coherent Laser Arrays - Storming Media
		This approach uses the interaction between elements in a coherent diode laser array that results in lateral mode locking.
		Linearized analysis of coupled laser rate equations shows that the array can be asymptotically stable for values of the coupling attainable with index-guided lasers.
		Large-signal analysis using full rate equations were used to demonstrate schemes for utilizing these microwave frequency resonances for high-speed optical signal transmissions.
	www.stormingmedia.us /37/3739/A373982.html (239 words)

	eLibrary Project : Laser diode (Site not responding. Last check: 2007-10-10)
		When a diode is forward biased, electron hole,holes from the p-region are injected into the n-region, and electrons from the n-region are injected into the p-region.
		If electrons and holes are present in the same region, they may radiative recombination,radiatively recombine—that is, the electron "falls into" the hole and emits a photon with the energy of the band gap.
		The team optically excites its QD laser by piezo scanning 780 nm continuous wave emission from a laser diode over the surface.
	elibraryproject.com /info/laser/diode.html (1921 words)

	Laser Technology (TFYY82)
		Basic laser theory and physical principles for laser operation are highlighted subjects.
		The course also aims to give the student an orientation on different laser applications and a general idea of the possibilities and limitations with laser technology.
		Laser sensors, remote sensing, free-space optical communication, range finding, laser imaging, medical applications, material processing etc.
	www.undervisning-ifm.foi.se /LT/2005/laser_technology_overview_05.htm (149 words)

	Dimensionless rate equations and simple conditions for self-pulsing in laser diodes (Site not responding. Last check: 2007-10-10)
		Rate equations modeling self-pulsating laser diodes have been investigated numerically by various groups.
		The low values of the decay rates of the carriers motivate analytical approximations for the domain of self-pulsation.
		These approximations highlight the effect of some physical processes (diffusion of the carriers, radiative recombination rate) which are important for self-pulsating diode lasers.
	www.ulb.ac.be /sciences/ont/abstract/abs35.html (96 words)

	Dependent Carrier
		See live article Laser diode rate equations The semiconductor laser multimode rate equations relate photon and carrier (electron) numbers or densities, to device parameters such as carrier and photon lifetime, optical gain, injection current and other material parameters.
		From these equations, it is possible to derive a...
		Equations 1.1 Explanation of Terms 2 Gain Compression 3 Spectral Shift The Multimode Rate Equations where: N and P are carrier and photon densities respectively.
	www.wncwabash.com /29/20.html (790 words)

	Handbook of Distributed Feedback Laser Diodes
		With a number of key advantages over other lasers, such as dynamic single-mode stability and low noise operation, Distributed Feedback (DFB) laser diodes are fast becoming the transmitters of choice in most optical communication systems today.
		Clearly written and packed with 378 equations and 171 crystal-clear illustrations, this book is an excellent information source for engineers and researchers involved in laser diode and optical systems design and manufacturing, and is a valuable learning tool for graduate students in optoelectronics, integrated optics, and optical engineering.
		Harmonic and Intermodulation Distortion in DFB Laser Diodes: Measuring the Harmonic Distortion.
	www.financebooks.velnet.com /artech/book271.htm (518 words)

	Encyclopedia of Laser Physics and Technology - laser cavities, laser diodes, laser design, linewidth, laser safety, ...
		Rüdiger Paschotta, explains basic terms and principles of laser physics and technology, with additional content from other topics such as general optics, nonlinear optics, fiber optics, quantum optics, optical fiber communications and optoelectronics.
		laser gain → gain, gain media, laser amplifiers
		There is a variety of various services available in topical areas such as lasers, laser amplifiers, nonlinear optics, fiber optics, multilayer mirrors, noise and fluctuations, and other topics in photonics and optoelectronics.
	www.rp-photonics.com /encyclopedia_l.html (177 words)

	Rate-Equation-Based Laser Models with a Single Solution Regime - Mena, Kang, DeTemple (ResearchIndex) (Site not responding. Last check: 2007-10-10)
		2 Transforming Tucker's linearized laser rate equations to a f..
		2 the semiconductor laser logarithmic gain-current density rel..
		1 Sensitivity degradation with laser wavelength chirp for dire..
	citeseer.ist.psu.edu /473592.html (596 words)

	Burn Rate: 3D View of the Web (Site not responding. Last check: 2007-10-10)
		Mio Shape Heart Rate Watch MIOâ¢ SHAPE is designed for people who want to manage their health through weight control and/or heart-rate monitoring.
		SHAPE accurately measures your heart rate with patented sensors that work by finger touch rather than the chest strap used by most other heart monitors.
		See live article Laser diode rate equations The semiconductor laser multimode rate equations relate photon and carrier (electron) numbers or densities, to device parameters such as carrier and photon lifetime, optical gain...
	www.resolve3d.com /Games/CardGames/SpecialDecks/BurnRate (1557 words)

	IngentaConnect Effect of gain switching frequency on ultrashort pulse generation... (Site not responding. Last check: 2007-10-10)
		In this work, the effects of gain switching frequency on ultrashort pulse generation are investigated using a model based on the multi-mode rate equations.
		In addition to the commonly used laser diode parameters, the key parameters corresponding to the different laser diode materials and structures are included in the model.
		The FWHM of pulses for shorter cavity lasers are found to be almost insensitive to the frequency.
	www.ingentaconnect.com /content/klu/oqel/1997/00000029/00000006/00173807 (315 words)

	EE 606
		Much of what will be introduced relies on the concept that many important non-equilibrium effects can be described in terms of a family of elementary excitations which usually only interact weakly with each other.
		This course is divided into; (i) introductory material, (ii) specific examples of non-equilibrium effects determining the performance of devices, (iii) presentation of selected research papers.
		The semiconductor laser: Optical cavities, laser diode rate equations for single-mode, multi-mode, and quantization of photon and electron number.
	www-classes.usc.edu /engr/ee-ep/606 (460 words)

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