
	Where results make sense

Topic: Semiconductor laser

	Semiconductor laser apparatus - Patent 4338577
		Semiconductor laser apparatus wherein a semiconductor laser device and a temperature sensor for sensing the temperature of the laser device are mounted on a heat sink or base and airtightly encapsulated.
		Semiconductor laser devices are used in a wide variety of fields because they are compact in size, have a relatively higher efficiency and are capable of producing modulated beams when current is suitably controlled.
		Since the semiconductor laser tip, the light sensor and the temperature sensor are mounted on the same cooling end plate of the cooling unit, the semiconductor laser apparatus may be controlled with a higher degree of accuracy.
	www.freepatentsonline.com /4338577.html (4826 words)

	Phase-locked semiconductor laser device - Patent 4503540
		A semiconductor laser device as claimed in claim 1 and further including further laminated structures at each end of said laminated structure, having a conductivity type opposite to that of said laminated structure, said further laminated structures thereby disposed between said laminated structure and facets of said laser device.
		This third semiconductor layer is made of a semiconductor material which is not narrower in the band gap and not higher in the refractive index than the first semiconductor layers and which does not have the same conductivity type as, at least, that of the first semiconductor layers.
		In general, it is the destruction of cleavage planes by a laser beam that determines the limitation of the output of a semiconductor laser.
	www.freepatentsonline.com /4503540.html (2767 words)

	Distributed feedback semiconductor laser and method for producing the same - US Patent 6151351 (Site not responding. Last check: 2007-10-21)
		A semiconductor laser according to claim 1, wherein the semiconductor regions are formed at least of a first semiconductor material having a bandgap energy which is smaller than the energy of light emitted from the active layer and a second semiconductor material having a bandgap energy which is larger than the energy of the light.
		A semiconductor laser according to claim 1, wherein the semiconductor regions are formed at least of a first semiconductor material having a bandgap energy which is smaller than the energy of light emitted from the active layer and a second semiconductor material compensating for refractivity of the first semiconductor material.
		A semiconductor laser according to claim 32, wherein the plurality of light absorption layers each have a thickness changing periodically in the direction of the optical axis and have a bandgap changing periodically in accordance with the periodical change in the thickness.
	www.patentstorm.us /patents/6151351.html (17081 words)

	Laser diode -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		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.
		For single spatial mode lasers, using symmetrical lenses, the collimated beam ends up being elliptical in shape, since the divergence is wider in the vertical direction than the lateral direction.
		The DFB laser has a stable wavelength that is set during manufacturing by the pitch of the grating, and can only be tuned slightly with temperature.
	www.absoluteastronomy.com /encyclopedia/l/la/laser_diode.htm (1410 words)

	A Surgical Semiconductor Laser With More Precision And Power
		The useful power output of semiconductor lasers is limited by the tendency of their beams to fragment into a number of parallel but weaker beams.
		Semiconductor lasers are also more efficient than gas lasers: A gas laser can take 5,000 watts of power to run a one-watt laser, but a semiconductor laser requires only five watts to produce the same power.
		By contrast, a semiconductor laser is the size of a coarse grain of salt.
	www.eurekalert.org /pub_releases/1996-11/UoR-ASSL-011196.php (815 words)

	Encyclopedia article on Laser [EncycloZine] (Site not responding. Last check: 2007-10-21)
		A laser (light amplification by stimulated emission of radiation) is a device which uses a quantum mechanical effect, stimulated emission, to generate a coherent beam of light from a lasing medium of controlled purity, size, and shape.
		The output of a laser may be a continuous, constant-amplitude output (known as CW or continuous wave), or pulsed, by using the techniques of Q-switching, modelocking, or gain-switching.
		The basic physics of lasers centres around the idea of producing a population inversion in a laser medium by "pumping" the medium; i.e., by supplying energy in the form of light or electricity, for example.
	encyclozine.com /Laser (2168 words)

	Articles - Laser (Site not responding. Last check: 2007-10-21)
		For a laser to operate, the gain medium must be "pumped" by an external energy source, such as electricity or light (from a classical source such as a flash lamp, or another laser).
		Lasers are also used for dermatological procedures including removal of tattoos, birthmarks, and hair; laser types used in dermatology include ruby (694 nm), alexandrite (755 nm), pulsed diode array (810 nm), Nd:YAG (1064 nm), Ho:YAG (2090 nm), and Er:YAG (2940 nm).
		Furthermore, science-fiction film special effects often depict weapon laser beams propagating at only a few metres per secondâ€”i.e., slowly enough to see their progress, in a manner reminiscent of conventional tracer ammunitionâ€”whereas in reality a laser beam travels at the speed of light, and would be instantly visible along its entire length.
	www.mupin.com /articles/Laser (2704 words)

	Mid-Infrared Semiconductor Laser Materials Engineering
		Semiconductor or diode laser technology relies primarily on the group III and group V elements of the periodic table, whereas computer chip technology relies on silicon wafers.
		Longer wavelength semiconductor lasers are a recent technological addition to the diode laser family and scientists expect them to play a major role in many military and civilian applications.
		Although lead-salt lasers are commercially available for wavelengths between 3 and 30 m, their low-temperature operation, low power, and lack of reliability, as compared to the III-V diode lasers, limit their use to high-resolution spectroscopy research.
	www.afrlhorizons.com /Briefs/Sept01/DE0109.html (1320 words)

	Bell Labs researchers build world's first high-performance, ultra-broadband semiconductor laser (Site not responding. Last check: 2007-10-21)
		However, semiconductor lasers are typically narrowband devices, emitting light of a single color at a characteristic wavelength.
		An ultra-broadband laser offers significant advantages in that it allows for sampling of a wide swath of wavelengths at the same time, and making a reliable one that can operate under a wide variety of operating conditions has been a goal for scientists for a long time.
		The new laser belongs to a class of high-performance semiconductor lasers - known as quantum cascade (QC) lasers - that were invented at Bell Labs in 1994 by Federico Capasso, Alfred Cho and their collaborators.
	www.lucent.com /press/0202/020221.bla.html (751 words)

	physics - Laser
		While the beam emitted by a laser often has a very small divergence (highly collimated), a perfectly collimated beam cannot be created, due to the effect of diffraction.
		Later, in 1994, it was discovered by Mourou and his team at University of Michigan that the balance between the self-focusing refraction (see Kerr effect) and self-attenuating diffraction by ionization and rarefaction of a laser beam of terawatt intensities in the atmosphere creates "filaments" which act as waveguides for the beam thus preventing divergence.
		Furthermore, science-fiction film special effects often depict weapon laser beams propagating at only a few feet per second—i.e., slowly enough to see their progress, in a manner reminiscent of conventional tracer ammunition—whereas in reality a laser beam travels at the speed of light, and would be instantly visible along its entire length.
	www.physicsdaily.com /physics/Laser (2016 words)

	Laser data link
		Laser modules are now quite widely available but the suitability of other modules for this application is not known (some laser modules might performace poorly).
		This TIM202 module is a small (38x14x14 mm) semiconductor laser module, similar to those types used in laser pointers.
		There are some semiconductor laser modules which have modulation option built into the laser module (separate wire for modulation signal).
	www.tkk.fi /Misc/Electronics/circuits/laserlink.html (950 words)

	Bell Labs researchers build world's longest wavelength semiconductor laser (Site not responding. Last check: 2007-10-21)
		It is the longest wavelength semiconductor laser ever made from standard semiconductor materials used in photonics and belongs to a class of high-performance lasers - known as quantum cascade (QC) lasers - that were invented at Bell Labs.
		Although the light emitted by the laser is invisible to the naked eye, falling in the far infrared region of the electromagnetic spectrum, it is ideal for spectroscopic applications.
		Even the standard QC laser design does not work well because a lot of the long wavelength light gets absorbed before it can be reflected enough times to induce a cascade of light of enough intensity to produce a laser.
	www.lucent.com /press/1000/001018.bla.html (935 words)

	Semiconductor laser makes broadband debut (February 2002) - News - PhysicsWeb
		Claire Gmachl and colleagues at Bell Labs believe their laser – which they plan to modify to emit visible light – could be used for gas sensing, metrology and optical communications (C Gmachl et al 2002 Nature 415 883).
		Existing broadband lasers – which are usually based on titanium-sapphire – are not always suitable because they only emit pulses of radiation.
		The light is intense enough for the device to act as a laser, and each layer is transparent to the light emitted by other layers.
	physicsweb.org /article/news/6/2/16 (455 words)

	SEMICONDUCTOR LASER DIODES
		The more conventional types of gas and liquid lasers with their industrial and medial applications have become well known if not familiar, but to date the semiconductor laser is known only through its use in optical telephone links.
		The development of the semiconductor light emitting diode in the early 1970s gave a large impetus to optical techniques of industrial measurements and also created the need for engineers to acquire a knowledge of optics.
		The term 'laser' has connotations of eye safety and one chapter of the book is devoted to the exact nature and degree of this hazard.
	www.elchempub.com /epfiles/ep17.htm (271 words)

	European Semiconductor Laser Workshop 2004
		The European Semiconductor Laser Workshop 2004 which will be held in Särö, Sweden, on September 3-4, 2004.
		The workshop is hosted by Chalmers University of Technology and Zarlink Semiconductor AB and sponsored by the Swedish Agency fo Innovation Systems (VINNOVA), Chalmers Center fo High Speed Technology (CHACH), and Center for High Speed Electronics and Photonics (HSEP).
		The workshop is intended to be an informal forum for the discussion of the latest developments in semiconductor lasers and amplifiers.
	www.een.bris.ac.uk /cost288/laserws.html (304 words)

	Encyclopedia of Laser Physics and Technology - saturable absorbers, Schawlow-Townes linewidth, self-focusing, ... (Site not responding. Last check: 2007-10-21)
		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.
		saturable absorber mirror → semiconductor saturable absorber mirrors
		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_s.html (148 words)

	Silvaco - Products
		Laser is the world’s first commercially available simulator for semiconductor laser diodes.
		Laser works in conjunction with Blaze in the ATLAS framework to provide numerical solutions for the electrical behavior (DC and transient responses) and optical behavior of edge emitting Fabry-Perot type lasers diodes.
		Laser was applied to the InP/InGaAsP laser diode.
	www.silvaco.com /products/vwf/atlas/laser/laser_br.html (449 words)

	PARC Semiconductor Laser Research
		Their pioneering innovations include the invention of laser printing in the 1970s, semiconductor laser diodes in the 1980s, and the world’s first multi-beam laser in the 1990s.
		Past laser research at PARC has been aimed primarily at improving the cost and quality of printing systems.
		The State of Semiconductor Light Sources: Blue laser diodes and beyond, Noble Johnson, Comdex, November 2002
	www.parc.com /research/projects/lasers (201 words)

	RIEGL Laser Measurement Systems - Laser Scanner
		Terrestrial scanners: The RIEGL terrestrial laser scanner systems consist of a high performance 3D scanner (or laser profilemeter), associated operating and processing software, and a calibrated high-resolution digital camera.
		Airborne Scanners: The RIEGL airborne laser scanners make use of the latest state-of-the-art laser technology and signal processing, thus meeting the most challenging requirements in airborne surveying.
		Industrial Scanners: The RIEGL industrial laser scanners are providing exceptionally high performance, reliability and lifetime for use in industry and in autonomously guided vehicles.
	www.riegl.co.at (2016 words)

	Semiconductor Laser Diode Test Equipment example
		Black Box Technologies was hired for this long-term project to develop multiple test station capability for the characterization, life-test, and burn-in of semiconductor laser diodes.
		These are high power lasers and require several amps of current for single devices and tens of amps for laser arrays.
		The life-test and burn-in stations were designed for 24-hour operation to control each laser independent of the others in constant current or constant power modes.
	www.blackboxtechnologies.com /bb_proj_se.htm (145 words)

	LASER POINTER / DIODE HOLOGRAPHY
		Creating a multi-color reflection hologram using a $7.99 laser pointer.
		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.
	www.holoworld.com /holo/diode.html (252 words)

	Oki Semiconductor
		The new 4050 and 4060 Series provides designers with a broad set of communications interfaces for a variety of applications.
		Check out Oki Semiconductor's ZigBee ready ML7065 which is a low-cost, low-power integrated single chip wireless solution that meets the IEEE802.15.4 Global Standard.
		Oki's ML7605 incorporate a 2.4 GHz radio (PHY) and Media access control (MAC) layer in a single package that provides wireless connectivity for PAN gateways used for home, business and industrial applications.
	www2.okisemi.com (211 words)

	THE PRINCIPLES OF SEMICONDUCTOR LASER DIODES AND AMPLIFIERS
		Innovative optical devices have emerged from the integration of semiconductor laser diodes, amplifiers and filters with optical waveguide technology.
		This book will provide engineering and science students with a basic understanding of laser diode and optical amplification through the analysis of the performance characteristics of these devices both in theory and application.
		Picosecond Pulse Amplification in Tapered-Waveguide Semiconductor Laser Diode Amplifiers
	www.icpress.co.uk /books/engineering/p275.html (253 words)

	Semiconductor Laser Diodes
		Our semiconductor laser diodes include, distributed feedback (DFB) lasers, and electro-absorption modulator integrated DFB (EA-DFB) lasers.
		With DFB lasers, NEL can prepare any wavelength between 1300 and 1650nm, with a wavelength selection of
		These products are qualified to meet the reliability standard of terrestrial communications.
	www.nel-world.com /products/photonics/semicon_ld.html (85 words)

	VECSEL: the other surface emitting semiconductor laser (Site not responding. Last check: 2007-10-21)
		Lasers, Optics, Plasma Sciences, Vision Science and Remote Sensing
		The Differences between VCSELS and VECSELS and a Standard Laser
		· NIR lasers around 1 µm could replace cw diode pumped Nd lasers
	www.sandia.gov /1100/X1118VECSEL.htm (159 words)

	Britney Spears guide to Semiconductor Physics: semiconductor physics, Edge Emitting Lasers and VCSELs
		It is a little known fact, that Ms Spears is an expert in semiconductor physics.
		Not content with just singing and acting, in the following pages, she will guide you in the fundamentals of the vital laser components that have made it possible to hear her super music in a digital format.
		Click here to donate food to the starving people of the world.
	britneyspears.ac /lasers.htm (121 words)

	AG Optoelektronische Bauelemente und Werkstoffe (Site not responding. Last check: 2007-10-21)
		Hoffmann, M. Breede and M. Hofmann, Two-color semiconductor lasers, SPIE Proceedings 5349, 218 (2004) Physics and Simulation of Optoelectronic Devices XII
		S.W. Koch and M.R. Hofmann, Physics of semiconductor lasers, Encyclopedia of Modern Optics, Academic Press, Lon 2, 502 (2004) eds.
		Zimmermann, J. Struckmeier, M. Hofmann, and J.-P. Meyn, Tunable blue laser based on intracavity frequency doubling with a fan-structured periodically poled LiTaO3 crystal, Opt.
	www.opto.rub.de /index.php?param=publikationen (1316 words)

Try your search on: Qwika (all wikis)