
	Where results make sense

Topic: Gain medium

	Optically pumped laser with multi-facet gain medium - Patent 6081542
		The angle of incidence for all beam segments entering or exiting the gain medium is 45 degrees to the corresponding facet.
		The gain medium is therefore optically pumped perpendicular to the direction of propagation of the intracavity laser beam.
		The gain medium 4 is centrally disposed in resonant cavity 2 and oriented such than any intracavity light beam incident upon one of the facets 20-23 passes through the gain medium and is refracted out thereof through another of the facets 20-23 in a direction either parallel or perpendicular to the incident beam.
	www.freepatentsonline.com /6081542.html (4544 words)

	Laser construction - Wikipedia, the free encyclopedia
		The gain medium is the major determining factor of the wavelength of operation, and other properties, of the laser.
		The gain medium is excited by the pump source to produce a population inversion, and it is in the gain medium that spontaneous and stimulated emission of photons takes place, leading to the phenomenon of optical gain, amplification.
		Light from the medium, produced by spontaneous emission, is reflected by the mirrors back into the medium, where it may be amplified by stimulated emission.
	en.wikipedia.org /wiki/Laser_construction (561 words)

	Gain-switching - Wikipedia, the free encyclopedia
		For solid-state and dye lasers, gain switching (or synchronous pumping) usually involves the laser gain medium being pumped with another pulsed laser.
		Since the pump pulses are of short duration, optical gain is only present in the laser for a short time, which results in a pulsed output.
		The term gain-switching derives from the fact that the optical gain is negative when carrier density or pump intensity in the active region of the device is below threshold, and switches to a positive value when carrier density or the pump intensity exceeds the lasing threshold.
	en.wikipedia.org /wiki/Gain-switching (321 words)

	Laser with absorption optimized pumping of a gain medium - Patent 6347101
		The gain medium of the Alcock laser is heated by the pumping radiation from the semiconductor laser to produce strong thermal lensing effects at the surface of the gain medium through which pumping occurs.
		Given the desired spacing between the gain mode 50 and the face 54 of the gain medium, the spacing between the pump laser 46 and the laser crystal 40 is then provided to match the vertical extent of the pumping radiation with the height 56 of the mode volume.
		The width of the gain mode 50, indicated as L.sub.h in the figures, is a strong function of the pump beam intensity and thermal lensing of the Nd:YVO.sub.4 gain medium 40.
	www.freepatentsonline.com /6347101.html (19977 words)

	Evaluation and adjustment of laser losses according to voltage across gain medium - US Patent 6804278 (Site not responding. Last check: 2007-10-30)
		The monitored voltage across the gain medium is indicative of optical losses associated with the external cavity, and may be used to control the external cavity loss profile.
		Gain medium 12 emits a coherent beam from front facet 16 that is collimated by lens 20 to define an optical path 22 that is co-linear with the optical axis of the external cavity.
		Relative gain is shown on the vertical axis and wavelength on the horizontal axis.
	www.patentstorm.us /patents/6804278.html (12067 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-30)
		To the output side of the gain medium 10 is a reflector 14 that has a high reflectivity for Raman-shifted wavelengths shorter than a desired output wavelength and a low reflectivity at the desired output wavelength.
		An optical gain apparatus according to Claim 1 wherein the first reflector comprises a single diffraction grating structure that has a reflectivity peak at a center wavelength and additional reflectivity peaks spaced at substantially uniform intervals in a wavelength spectrum surrounding the center wavelength, and a low reflectivity at wavelengths between said reflectivity peaks.
		An optical gain apparatus according to Claim 1 wherein the first reflector comprises a diffraction grating having a plurality of grating sections that have substantially the same grating pitch and that are substantially equally spaced apart along the length of the grating.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=01/54238.010726&ELEMENT_SET=DECL (3386 words)

	Active laser medium - Wikipedia, the free encyclopedia
		Within a laser, the active laser medium is the material that exhibits optical gain.
		This gain is generally generated by stimulated emission on electronic or molecular transitions to a lower energy state, starting from a higher energy state to which it had been previously stimulated by means of a pump source.
		More exotic gain media can be pumped by chemical reactions, nuclear fission, or with high-energy electron beams.
	en.wikipedia.org /wiki/Active_laser_medium (199 words)

	Laser with optimized coupling of pump light to a gain medium in a side-pumped geometry - Patent 6157663
		The gain medium of the Alcock laser is heated by the pumping radiation from the semiconductor laser to produce strong thermal lensing effects at the surface of the gain medium through which pumping occurs.
		Given the desired spacing between the gain mode 50 and the face 54 of the gain medium, the spacing between the pump laser 46 and the laser crystal 40 is then provided to match the vertical extent of the pumping radiation with the height 56 of the mode volume.
		The width of the gain mode 50, indicated as L.sub.h in the figures, is a strong function of the pump beam intensity and thermal lensing of the Nd:YVO.sub.4 gain medium 40.
	freepatentsonline.com /6157663.html (20323 words)

	United States Patent Application: 0020018495
		The head 11 comprises a reflecting mirror 21, a Q switch element 22, a gain medium 23, an output mirror 24, a condenser lens 25, a nonlinear optical crystal 26, an optical lens 27, a narrow band filter or dichroic mirror 28, and two lenses 25 and 27.
		However, since the excitation light enters the gain medium 23 for a long period while the Q switch closes before an oscillation is started, a gain accumulated in the gain medium 23 excesses a specified value.
		During the pause period T2B, the gain accumulated in the medium 23 is controlled, and the pulse output is thus controlled.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/PTO/search-adv.html&r=1&f=G&l=50&d=PG01&p=1&S1=20020018495&OS=20020018495&RS= (3896 words)

	Laser with gain medium configured to provide an integrated optical pump cavity - Patent 6570902
		The inner and outer regions of the solid state gain medium may be formed as a composite structure by bonding suitably doped materials, or alternatively the dopant concentration distributions of the inner and outer regions of the solid state gain medium may be formed during the material fabrication process.
		In one embodiment both the inner and outer regions of the solid state gain medium comprise a YAG crystal, the inner region is doped with ytterbium, and the outer region is substantially undoped.
		The pump cavity in the solid state gain medium 1200 is defined by an upper reflective surface 1210 and an oppositely-positioned lower reflective surface 1212, and a first and second flat lateral surface 1220 and 1222 arranged in an opposing parallel relationship.
	www.freepatentsonline.com /6570902.html (15688 words)

	Gain-switching (Site not responding. Last check: 2007-10-30)
		For solid-state and dye lasers gain switching (or synchronous pumping) usually involves the laser gain medium pumped with another pulsed laser.
		Since the pulses are of short duration optical gain only present in the laser for a time which results in a pulsed output.
		The term gain-switching derives from the fact that the gain is negative when carrier density or intensity in the active region of the is below threshold and switches to a value when carrier density or the pump exceeds the lasing threshold.
	www.freeglossary.com /Gain-switching (267 words)

	Optical gain medium having doped nanocrystals of semiconductors and also optical scatterers - US Patent 5434878 (Site not responding. Last check: 2007-10-30)
		An optical gain medium comprises a multi-phase system wherein: a first phase is an electromagnetic radiation emitting and amplifying phase (16) that is comprised of doped semiconductor nanocrystals; a second phase is an electromagnetic radiation scattering phase (14); and a third phase is a substantially transparent (at the wavelengths of interest) matrix phase (12).
		A device as set forth in claim 13, wherein said gain medium is embodied as one of: a monolithic structure, a coating, a layer, and a region within a host structure.
		It is an object of this invention to provide an optical gain medium this is comprised of doped semiconductor nanocrystals, in combination with high index of refraction contrast radiation scatters, that provides laser-like activity when excited from a source of excitation energy.
	www.patentstorm.us /patents/5434878.html (5642 words)

	: Article - Noncontact Laser Speed Measurements : (Site not responding. Last check: 2007-10-30)
		The gain medium exists to amplify the intensity of light that passes through it and can be a gas, liquid, or solid.
		When the gain is high enough that it offsets losses in the cavity, light bouncing between the mirrors gets completely regenerated in the gain medium, meaning that the cavity is now oscillating.
		Since the power supplied to the gain medium is constant, the laser responds to this reduced threshold condition by producing slightly more output power.
	www.lightworksllc.com /news/page116.htm (728 words)

	United States Patent Application: 0030146442
		[0010] Preferably, the body of optical gain medium is surmounted by a conductively-doped layer and overlies a conductively-doped layer surmounting the DBR mirror and electrodes are connected to the conductively-doped layers for electrical activation of the device, whereby the device is operable as a diode.
		The optical gain medium overlying the DBR mirror is substantially defect-free because the mirror stops threading dislocations propagating from the underlayer.
		This potential causes generation of photons in the gain medium 18 and emission of these photons through the top surface 18a of this medium 18 as shown by arrows 26.
	appft1.uspto.gov /netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=/netahtml/PTO/srchnum.html&r=1&f=G&l=50&s1="20030146442".PGNR.&OS=DN/20030146442&RS=DN/20030146442 (3373 words)

	Lasers with low doped gain medium - Patent 6185235
		Scaling to higher powers is achieved with the use of a low doped gain media, increasing the length of the gain media as well as increasing the pump volume.
		The power of the lens in a diode pumped Vanadate laser is due to two major contributions: the lens due to the index change in the bulk and the lens due to the bulge in the surface of the crystal.
		A first Nd:YVO.sub.4 gain medium is positioned in the resonator cavity with a pump volume of at least 8 mm.sup.3.
	www.freepatentsonline.com /6185235.html (3645 words)

	How Lasers Work
		The gain in the laser oscillator is provided by atoms, ions, molecules and ‘free’ electrons while an optical resonator consisting of a pair of curved/plane/a combination of curved and plane mirrors provide the feedback.
		Useful output from the laser is obtained through the output-coupler whose transmission depends on the gain of the medium.
		The reflectivity of the output coupler depends upon the magnitude of the gain of the medium.
	www.iitk.ac.in /celt/lecture_laser/work.HTM (1643 words)

	Defintion of lasers - Chemistry Dictionary
		The specific components of a laser vary depending on the gain medium and whether the laser is operated continuously (cw) or pulsed.
		The gain medium in a solid-state laser is an impurity center in a crystal or glass.
		The gain medium in a dye laser is an organic dye molecule that is dissolved in a solvent.
	www.chemicool.com /definition/lasers.html (468 words)

	Encyclopedia: Gain medium
		fluorescein isothiocyanate Fluorescein is a fluorophore commonly used in microscopy, in a type of dye laser as the gain medium, and in forensics and serology to detect latent blood stains.
		A dye laser is a laser that uses an organic dye as a lasing medium, usually as a liquid solution.
		A laser diode is a laser where the active medium is a semiconductor p-n junction similar to that found in a light-emitting diode.
	www.nationmaster.com /encyclopedia/Gain-medium (1478 words)

	Howzit Work? Laser Light - Part 2 (Site not responding. Last check: 2007-10-30)
		The idea is to excite the gain medium to appropriate levels with a fair amount of efficiency.
		Gain medium: There are many types of laser gain medium.
		A high reflector, which is 100% reflective, and an output coupler, designed to reflect all but a small portion of the light energy, are placed on either end of the gain medium.
	fathom.org /Stephen/hdtw/laser2.html (255 words)

	MICROCHIP LASER (WO9009688A1)
		The cavity length (l) is selected so that the gain bandwidth of the gain medium is less than or substantially equal to the frequency separation of the cavity modes and such that a cavity mode frequency falls within the gain bandwidth.
		In another aspect, a solid-state gain medium is disposed between two mirrors, the distance between the mirrors selected so that the gain bandwidth of the gain medium is less than or substantially equal to the frequency separation of the cavity modes.
		To insure that the gain medium will lase, it is necessary that there be at least some overlap of the gain curve 10 with one of the intracavity modes such as the mode 18 as shown in Fig.
	www.delphion.com /details?pn=WO09009688A1 (863 words)

	Low phonon energy gain medium and related active devices - Patent 7003981
		Using sol-gel techniques, an optical gain medium has been fabricated comprising a glass ceramic host material that includes clusters of crystalline oxide material, especially tin oxide, and that is doped with active ions concentrated at the clusters.
		According to the invention there is provided an optical gain medium comprising a glass ceramic host material that includes clusters of crystalline oxide material and that is doped with active ions concentrated at the clusters.
		The gain medium of the invention is thus superior to the previously proposed low phonon energy host materials based on fluoride glasses which are silica incompatible, and to silica glasses doped directly with active ions.
	www.freepatentsonline.com /7003981.html (5824 words)

	Notes part 5
		Since the gain in the medium may be small (e.g.
		The condition for steady state laser operation is that the gain equals the sum of the losses.
		In a high gain medium, k is high, lasing is achieved easily and the cavity is not too critical.
	www.sun.rhbnc.ac.uk /~uhap045/331/notes5/notes5.html (729 words)

	Encyclopedia of Laser Physics and Technology - four-level and three-level gain media, reabsorption, crystals, glass, ...
		Optical amplification in the gain medium of a laser or laser amplifier arises from stimulated emission, where the input light induces transitions of laser-active ions from some excited state to a lower state.
		This means that there is no absorption of the gain medium in the unpumped state, and the gain usually rises linearly with the absorbed pump power.
		Pronounced three-level behavior is inevitable for gain media with a very small quantum defect, because this enforces a small energy spacing between the lower laser level and the ground state, so that thermal population of the lower laser level is significant.
	www.rp-photonics.com /four_level_and_three_level_gain_media.html (1183 words)

	IP.com's Prior Art Database
		Disclosed is a method that predicts the correction value for the ideal calibration position of a tunable laser as a function of gain medium current.
		Depending on the characteristics of the gain medium, this range introduces channel instability and frequency drift if the channel position is not compensated accordingly.
		The disclosed method predicts the correction factor in the channel calibration as a function of the gain medium current for tunable lasers that operate by suppressing adjacent “super channels”.
	www.priorartdatabase.com /IPCOM/000010807/privacy.jsp (350 words)

Try your search on: Qwika (all wikis)