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Topic: Optical cavity

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 AURIGA: the optical readout project
The optical resonance of the reference cavity needs also to be guaranteed; it is now not possible to follow the cavity with the laser frequency, as this is already locked to the transducer cavity.
The difference lies in the way the mechanical signal of the bar vibration is converted into an electromagnetic one: here a resonant optical cavity (a Fabry-Perot cavity) is housed between the bar and the transducer.
Delivery of the laser beam to the transducer cavity is accomplished by a single-mode polarization maintaining optical fiber.
www.auriga.lnl.infn.it /auriga/RandD/optical.html

 Cavity QED Research
With recent developments in optical cavity QED pioneered in the Quantum Optics Group at Caltech, optical physics has progressed to a domain wherein processes are driven by single atoms interacting with optical fields with average energy corresponding to much less than one photon.
Driven by the quest for yet higher cavity finesse in combination with small mode volume, we have also investigated microsphere cavities as a possible setting for extending our work with cold atoms.
One exciting prospect is that by observing atoms passing through the standing wave structure of the cavity mode, it should be possible to approach the standard quantum limit for measurement of the atomic position.
www.cco.caltech.edu /~qoptics/cqed.html

 Patent 4953176: Angular optical cavity alignment adjustment utilizing variable distribution cooling
The present invention relates to alignment of a laser optical cavity when mirrors, or other beam guiding elements, are attached to a structural member, such as a plasma tube, and thermal gradients in the structural member cause bending of the structural member, and resulting misalignment of the cavity.
Bending of the plasma tube can be decoupled from alignment of the optical cavity by using an external resonator, that is, a resonator where the mirrors are not connected to the plasma tube.
At least one optical element is mounted on the structural member for guiding the laser beam along the optical path.
www.freepatentsonline.com /4953176.html

 Optical Cavity-Ring-Down Measurement of Soot Concentration
In this case, the ring-down cavity is an optical one, the absorption and scattering of light by soot contributes to the decay of an optical signal, and the concentration of soot is the quantity to be determined from the measured rate of decay.
An optical technique for measuring the concentration of soot in air is based on the cavity-ring-down (CRD) principle, which is so named because it involves observation of the decay ("ring-down") of a signal echoing in a cavity.
The ring-down cavity is bounded by two confocal mirrors with a radius of curvature equal to or greater than the distance between them.
www.nasatech.com /Briefs/Jan99/LEW16541.html

 Lasers (Science Tracer Bullet - Science Reference Services, Libraryof Congress)
In the process, the optical cavity or resonator forces the excited atoms to radiate in phase, and concentrates the light to stimulate the emission of laser radiation.
Optical feedback elements allow a beam of radiation to either pass once through the laser medium (i.e., as in a laser amplifier) or bounce back and forth repeatedly through the laser medium, amplifying the light (i.e., as in a laser oscillator).
A carefully aligned laser mirror is added at each end of the collection of atoms to form an optical resonator, in which the lightwave can bounce back and forth many times.
lcweb.loc.gov /rr/scitech/tracer-bullets/laserstb.html

 Patent 4793709: Method and apparatus for measuring the losses of an optical cavity
The apparatus is arranged for measuring the intensity decay time.tau..sub.c of an optical cavity 10 which includes a plurality of mirrors 10, 12, 14 and 16 for directing an input beam of light about the cavity 10.
A method and associated apparatus for measuring the intensity decay time of an optical cavity is particularly useful for accurate measurement of cavities of the type that include highly reflective mirrors.
The foregoing and additional shortcomings of the prior art are addressed and overcome by the present invention that provides, in a first aspect, apparatus for measuring the intensity decay time of an optical cavity.
www.freepatentsonline.com /4793709.html

The resonator in a laser is an optical cavity.
Translations for "OPTICAL CAVITY"; alternative meanings/domain in parentheses.
Region bounded by two or more reflecting surfaces, referred to as mirrors, end mirrors or cavity mirrors, whose elements are aligned to provide multiple reflections.
www.websters-dictionary-online.net /definition/english/op/optical+cavity.html

 MLF Cavity Enhanced Absorption Spectroscopy
Light from a narrow band cw laser is coupled into a high-finesse stable optical cavity when accidentally coincident with one of the multitude of modes of this cavity.
Under the conditions that the scanning laser is sufficiently long in resonance with one of the cavity modes that the light intensity inside the cavity approaches its limiting value, the time-integrated light intensity exiting the cavity is in a good approximation proportional to the ring down time $\tau$.
Cavity Enhanced Absorption spectroscopy in the 10 mum region using a waveguide CO2 laser.
www.rijnh.nl /users/berden/cea.html

 Cascaded second-order nonlinearity in an optical cavity
Phase-mismatched optical second-harmonic generation in a low-loss external enhancement cavity is used to generate an effective third-order nonlinearity for continuous-wave laser radiation.
The cascading effect is demonstrated by detecting bistability of the line shape of a low-loss monolithic MgO:LiNbO
www.exphy.uni-duesseldorf.de /Publikationen/pub96_4.htm

 Laser resonators
From quantum mechanics we know that the photon is both a particle and a wave, the geometrical optic description of the Fabry-Perot cavity is related to the particle viewpoint, while the description of the cavity in terms of diffraction is based on the wave nature of light.
If the ions are placed within a cavity, the gain can be significantly improved to the point where the output beam becomes coherent, extremely narrow and of significantly reduced spectral width, essentially producing a single resonant mode of electromagnetic radiation.
The cavity is used not only to maintain a large enough electromagnetic field strength to stimulate emission from excited ions but also to maintain feedback and thus coherence of the output beam.
home.achilles.net /~ypvsj/glossary/fp.html

 Laser Focus World - ABSORPTION SPECTROSCOPY: Optical cavity opens door to better detectors
Using a pair of concave, highly reflective mirrors, researchers form an optical cavity that contains a gas sample.
When gas in the cavity absorbs the light, the decay rate speeds up, so a measurement of the rate of ring-down shows how much of a given molecule is present.
He uses a small ring cavity made of fused silica in the shape of a regular polygon with a convex facet, which provides for total internal reflection of laser pulses injected with photon tunneling through a pair of coupling prisms (see figure).
cgw.pennnet.com /Articles/Article_Display.cfm?Section=Archives&Subsection=Display&ARTICLE_ID=54413&KEYWORD=Savage

 AG Rempe: Cavity Quantum Electrodynamics
We work on such an experiment combining a small, ultra-high finesse optical cavity with an atomic fountain as a source of ultracold atoms.
Although our cavity contains on average less then a single photon, the mechanical effects on the ultracold atoms can be substantial.
We have studied the motion of atoms in a cavity containing only one photon at most, and found that the atom moves under the influence of a modified dipole force, a novel velocity-dependent force and a momentum diffusion force.
www.mpq.mpg.de /qdynamics/projects/cqed/cqed.html

It is desirable to have an optical cavity that exhibits good mode control in order to maximize FEL efficiency, stability and the beam quality of the out-coupled signal.
Initial operation of the optical cavity will be without active stabilization but the capability to add it later will be designed in.
The cavity round trip must be chosen as an integral multiple of the pulse repetition rate and the cavity must be long enough to keep the heat fluence on the mirrors within tolerable bounds.
www.cebaf.gov /accel/fel/documentation/feldoc9-5-1-3.html

 Optical Cavity, wwwOptical Cavity .com
Optical nonlinear dynamics with cold atoms in a cavity Optical nonlinear potical cavity dynamics with cold atoms in a cavity OpticalCavity.co This paper presents the nonlinear otical cavity dynamics of laser cooled and trapped OpticalCavity.xom cesium atoms placed inside an optical cavity and interacting...arxiv.org/abs/quant-ph/9801054
Quasioptic dielectric tetrahertz cavity: Coupled through optical tunneling.
An optical cavity, also opitcal cavity known as a resonator, is a cavity OpticalCavity.cim with walls which will reflect optcal cavity electromagnetic...
nald.com /Optical_Cavity

 United States Patent Application: 0030160254
Typically, these laser-diodes have multilayered vertically oriented optical cavity structures that comprise a substrate, a double-heterostructure (LED) "Light Emitting Diode", a zinc-blend semiconductor material comprised superlattice, and two feedback providing contra-reflecting mirror structures.
Further, these multilayered structures altogether are used to provide for an optical cavity capable of producing a frequency doubled laser emission output.
VCSELs that emit in a single optical transverse mode are ever increasingly being sought-out for emerging applications including data-communication using single-mode optical fiber, barcode scanning, laser printing, optical read/write data-heads, and modulation spectroscopy.
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="20030160254".PGNR.&OS=DN/20030160254&RS=DN/20030160254

 Definition: optical cavity
optical cavity: A region bounded by two or more mirrors that are aligned to provide multiple reflections of lightwaves.
Note: The resonator in a laser is an optical cavity.
www.atis.org /tg2k/_optical_cavity.html

 Optical Cavity (Resonator) : Photon inc. Glossary of Terms
Optical Cavity (Resonator): Photon inc. Glossary of Terms
www.photon-inc.com /glossary/OpticalCavity.shtml

 Patent 4250538: Full frame flash illumination system utilizing a diffuse integrating optical cavity
An illumination system for a document copying machine including an optical cavity having interior walls coated with a white, diffusely reflecting material.
Applying this theoretical analysis to cavity 10, it will become apparent that when source 42 is pulsed and caused to flash, light is directed against the cavity walls, and after undergoing multiple reflections from all interior surfaces, produces a near-uniform diffuse illumination at the platen.
One end of the cavity contains a platen for positioning document to be copied while the opposing end contains a lens for forming an image of the document on a light sensitive image plane.
freepatentsonline.com /4250538.html

 Correlation functions in an optical Cavity QED system
Our experimental realization consists of a high finesse optical cavity traversed by a beam of optically prepumped ^85Rb atoms.
We investigate changes in g^(2) for different driving intensities while keeping the system on resonance and in the lower branch of optical bistability.
It is characterized by a single atom coupling rate g three times larger than either the cavity or the atomic decay rates and by n_0 = 0.08.
flux.aps.org /meetings/YR97/BAPSAPR97/abs/S260005.html

 Modelocked Cavity--Enhanced Absorption Spectroscopy
Nakagawa, T. Katsuda, A. Shelkovnikov, M. de Labachelerie, and M. Ohtsu, “Highly sensitive detection of molecular absorption using a high finesse optical cavity,” Opt.
Romanini, “Cavity ring down spectroscopy versus intra cavity laser absorption spectroscopy,” in Cavity–Ringdown Spectroscopy – A New Technique for Trace Absorption Measurements (K. Busch and M. Busch, eds.), (Washington, DC, American Chemical Society, 1998).
The uniformity of the modelocked frequency comb is the feature allowing effective injection of a high finesse cavity.
www.opticsexpress.org /abstract.cfm?URI=OPEX-10-19-1033

 Optical cavity
An optical cavity, also known as a resonator, is a cavity with walls which will reflect electromagnetic waves( light).
Optical Microsystems in Silicon Based on a Fabry-Perot Resonance Cavity: Application for Spectral Analysis of Visible Light
This will allow standing wave modes to exist with little loss outside the cavity.
www.freeglossary.com /Optical_cavity

An optical-cavity is made by getting two mirrors and facing them towards each other.
With the mirrors perfectly parallel to each other, the light will bounce back and forth between the two -- so this is often called a cavity because it is like a box ("cavity") where you can trap light.
By using curved mirrors, the light can be stopped from travelling sideways and escaping.
www.moo.uklinux.net /kinsler/ircph/maze/optical-cavity.html

 Cavity Ring-down Spectroscopy
In recent years, cavity ring-down spectroscopy (CRDS) has been employed to measure the optical absorption of gases with extremely high sensitivity by utilizing the photon decay time in a high-finesse optical cavity as the absorption sensitive observable.
EW-CRDS utilizes novel optical cavity designs that employ total internal reflection (TIR) at ultra-smooth surfaces which have a root-mean square surface roughness of typically less than an atomic diameter.
The miniature, monolithic TIR-ring cavity, which employs photon tunneling for excitation and detection of cavity modes, provides broad spectral bandwidth thereby allowing multiple surface species to be probed with a single device.
www.cstl.nist.gov /div836/836.05/thermometry/humidity/crds.htm

Keller, B. Lange, K. Hayasaka, W. Lange, H. Walther, Quantum Information Processing with Ions Deterministically Coupled to an Optical Cavity.
In: Quantum Information Processing, T. Beth, G. Leuchs, Eds., Wiley, Berlin, 2003, S. Keller, B. Lange, W. Lange, H. Walther, Quantum Information Processing with Ions Deterministically Coupled to an Optical Cavity.
von Zanthier, H. Walther, Towards an Indium Single-Ion Optical Frequency Standard.
www.laser.physik.uni-muenchen.de /lg/selrep03.html

 University of Dayton Electro-Optics
R.J. Brecha, P.R. Rice and M. Xiao, "N Two-level Atoms in a Driven Optical Cavity: Quantum Dynamics of Forward Photon Scattering for Weak Incident Fields," Phys.
Hardie, K. Barnard, J. Bognar, E. Armstrong and E. Watson, “High Resolution Image Reconstruction From a Sequence of Rotated and Translated Frames and its Application to an Infrared Imaging System,” Optical Engineering, Vol.
Winner of the 1998 Rudolf Kingslake Medal and Prize (selected by Awards Committee as the most noteworthy original paper to appear in Optical Engineering in 1998).
www.engr.udayton.edu /ElOptics/pub.asp

 Brian J Orr: Curriculum Vitae
Orr and Y. He, "Optical Heterodyne Detection in Optical Cavity Ringdown Spectroscopy," Australian Provisional Patent Applications PQ8724 (12 July 2000) and PQ9785 (30 August 2000); International (PCT) Patent Application (ref. no.
Y.He, G.W.Baxter and B.J.Orr, "Locking the cavity of a pulsed PPLN optical parametric oscillator to the wavelength of a cw injection-seeder by an 'intensity-dip' method," Review of Scientific Instruments, 70, 3203 - 3213 (1999).
G.W.Baxter, M.J.Johnson, J.G.Haub and B.J.Orr, "OPO CARS: coherent anti-Stokes Raman spectroscopy using tunable optical parametric oscillators injection-seeded by external-cavity diode lasers," Chemical Physics Letters, 251, 211 - 218 (1996).
www.chem.mq.edu.au /~borr/further.htm

 Momentum Transfer of an Atom Moving in an Optical Cavity
We study a two-level atom moving slowly in an optical cavity, and give the time dependence of its mean momentum.
When an atom moves in an optical cavity, the total momentum of the atom does not remain constant.
Momentum Transfer of an Atom Moving in an Optical Cavity
stacks.iop.org /0256-307X/18/1069

 PMIC - Advanced Materials Testing Laboratory. Moisture Expansion, Thermal Expansion, Diffusivity, Specific Heat, Emmisivity, Mechanical, Optical, NDT, LVDT.
R.J. Oram, I.D. Latimer and S.P. Spoor "Measurements of the frequency stability of ultralow thermal expansion glass ceramic optical cavity lasers" Measurement Science and Technology Vol.
Moisture Expansion, Thermal Expansion, Diffusivity, Specific Heat, Emmisivity, Mechanical, Optical, NDT, LVDT.
www.pmiclab.com /company/Publications.html

 Low dark current far infrared detector with an optical cavity architecture
Increased responsivity due to the optical cavity effect is experimentally verified by using three detector structures., with three different cavity structures.
The intrinsic region thickness and the bottom contact are used to obtain an optical cavity effect thus increasing the absorption to almost 100%.
Low dark current far infrared detector with an optical cavity architecture
www.phy-astr.gsu.edu /perera/papers/fidt.htm

 laser diodes, optical, cavity Engineering Web Search Results
laser diodes, optical, cavity Engineering Web Search Results
The beam quality of 800 nm AlGaAs/GaAsP broad-area (BA) laser diodes with large optical cavity (LOC) wave- guide structures was studied under high power..
Vertical Cavity Surface Emitting Laser Diodes (VCSELs) Optically Pumped Semiconductor..
www.designinfo.com /Industrial/laser_diodes/optical/cavity

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