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Topic: Resonant cavity

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Resonance

Interference

Laser construction

Sagnac interferometer

Population inversion

Carbon dioxide laser

Interferometer

Ring laser gyro

Laser

Laser applications

Radar

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	Waveguide series resonant cavity for enhancing efficiency and bandwidth in a klystron - Patent 6259207
		The resonant cavity is inductively coupled to the output waveguide through an iris that sets the phase of the reflection by virtue of its location in relation to the klystron output gap and the magnitude of the reflection by virtue of its size.
		Attached to the resonant cavity 20 are adjustable tuners for tuning the resonant frequency of the resonant cavity 20.
		By increasing the size of the coupling iris 22, the Q of the resonant cavity 20 is lowered, causing the frequency response curve of the resonant cavity to be broadened.
	www.freepatentsonline.com /6259207.html (5094 words)

	Ultrafast laser with multiply-folded resonant cavity - Patent 6055261
		The invention relates in particular to a laser having a resonant cavity containing at least one pair of fold-mirrors having a peak-reflectivity greater than 99.97 percent and arranged to cause multiple reflections therebetween of laser-light circulating in the resonant cavity.
		In a simple arrangement of a laser cavity and dielectric material therein, such as, a gain medium and a mode locking device, total cavity GVD would be positive, i.e., shorter wavelength light experiences a higher refractive index and lower group velocity and lags behind longer wavelength light.
		A folded resonator cavity 12 is terminated at opposite ends thereof by end-mirrors 14 and 16.
	www.freepatentsonline.com /6055261.html (3934 words)

	Several types of cavities
		Cavity resonators are energized in basically the same manner as waveguides and have a similar field distribution.
		The increase in capacitance causes a decrease in the resonant frequency.
		Resonant cavities are widely used in the microwave range, and many of the applications will be studied in chapter 2.
	www.tpub.com /neets/book11/44n.htm (691 words)

	Resonant Cavities - Microwave Encyclopedia - Microwaves101.com
		A resonant cavity forms a means of storing electromagnetic energy, at a particular frequency within a small bandwidth.
		A resonant cavity must be constructed of a good conductor, and the shape of the cavity is related to the frequency that it can resonate at.
		Microwave tubes and waveguide filters are examples of resonant cavity by design.
	www.microwaves101.com /encyclopedia/resonantcavities.cfm (153 words)

	Photonic crystal-based resonant cavity and resonator - Patent 7012946
		The photonic crystal-based resonant cavity as claimed in claim 1, wherein the third dielectric substances have the largest possible size that is capable of being inserted in a unit cell formed by the plurality of second dielectric substances without overlapping the second dielectric substances.
		The photonic crystal-based resonant cavity as claimed in claim 1, wherein the plurality of third dielectric substances are disposed on border lines between the unit cells formed by the plurality of second dielectric substances.
		The photonic crystal-based resonant cavity as claimed in claim 1, wherein the one or more defects are formed by omitting dielectric substances at a predetermined position in the first periodic structure of the plurality of second dielectric substances or in the second periodic structure of the plurality of third dielectric substances.
	www.freepatentsonline.com /7012946.html (3239 words)

	Regenerative amplifier incorporating a spectral filter within the resonant cavity - Patent 5592327
		For example, this invention results in a significant reduction of unwanted self-oscillation emission at the peak of the gain from the resonant cavity of the regenerative amplifier when the seed pulse being amplified has a central wavelength that is substantially different from that corresponding to the peak of the gain of the amplifying medium.
		The resonant cavity is formed by mirrors 13, and 14, which are made to be high reflectors at the operating wavelength of the seed laser pulse.
		Thus the inclusion of a multi-plate birefringent filter within the resonant cavity of the regenerative amplifier seeded with pulses of femtosecond duration allows this system to produce pulses of longer duration that are tunable over a broad range, and at the same time serve to limit the self-oscillation of the amplifier cavity itself.
	www.freepatentsonline.com /5592327.html (5242 words)

	Resonant-cavity optical device (US5677924)
		A resonant-cavity optical device, eg a vertical cavity surface emitting laser, has a substrate upon which are provided a Bragg reflector multilayer bottom mirror, a semiconductor lower spacer region, an active region, and a dielectric region which surrounds the bottom mirror, the active region and the lower spacer region.
		Vertical cavity surface emmitting lasers with transparent electrodes
		60(8), 24 Feb. 1992, "Resonant Cavity Light-Emitting Diode," pp.
	www.delphion.com /details?&pn=US05677924__ (338 words)

	Cavity Resonance
		The single frequency cavity resonance suggests a parallel with the single resonant frequency of a mass on a spring.
		If the opening to the cavity is larger, the excess air can escape more rapidly to bring the pressure down to atmospheric, and this leads to a higher cavity resonant frequency.
		If the cavity volume is increased, then it takes a greater excess mass of air to produce a given overpressure, and it therefore takes longer for that excess pressure to be relieved.
	hyperphysics.phy-astr.gsu.edu /hbase/waves/cavity.html (496 words)

	Project 2005 - Acoustic Resonance Cavity Hyperspectra Imaging
		A resonant cavity is a confined region that supports standing waves through reinforcing reflections.
		The resonant cavity sensor problem is to design an excitation source and receiver to excite the cavity and measure its resonant response.
		The resonant cavity inverse problem considers the history of excitiation frequencies, and a model of the cavity, to create a 3-D image of the internal structure of the cavity.
	www.ret.neu.edu /projects/project05-acoustic_resonant.htm (634 words)

	RESONANT CAVITY FILTER
		Resonant Cavity resonators is a cavity that consists of interior surfaces, reflecting one type of wave.
		(1) In usual electronic equipment, resonant cavities are made up of a coil and a capacitor which can be either connected in series or parallel.
		Resonant cavities can have a variety of shapes and give the same results.
	students.washington.edu /lea4/ee/resonant.html (255 words)

	Advanced Medical Cosmetic Lasers
		The space formed by the optical medium bounded by the two mirrors is called the resonant cavity.
		Other components that may be within the cavity include apertures to shape the beam and shutters to control laser action.
		In addition to 1064nm, cavity mirrors are also highly reflective at 532nm, and the output coupler is highly transmitting at this doubled frequency.
	store02.prostores.com /servlet/advancedmedica00/Page?template=emptypage (1690 words)

	ELECTRON SPIN RESONANCE
		The sample is placed in a tuned cavity, and a bridge detector is used to detect the change in reflected power from the cavity when resonance is reached.
		Thus, it is possible to measure the resonant frequencies of a resonant cavity by monitoring the intensity of the transmitted microwaves as a function of frequency.
		The cavity size is then changed by turning the adjustment and watching for a change in the DC level on the oscilloscope.
	class.phys.psu.edu /p559/experiments/html/Esr_long_2004.htm (4875 words)

	Cavity resonator - Biocrawler (Site not responding. Last check: )
		When a wave that is resonant with the cavity enters, it bounces back and forth within the cavity, with low loss (See standing wave).
		Some common examples of cavity resonators include the klystron tube in a microwave oven (see also magnetron), the tube of a flute, and the body of a violin (this latter also being an example of a Helmholtz resonator).
		Thus an optical cavity, also known as a resonator, is a cavity with walls which reflect electromagnetic waves (light).
	www.biocrawler.com /encyclopedia/Resonant_cavity (271 words)

	Fast Neutron Research Facility (Site not responding. Last check: )
		The resonant frequency of the circuit is increased by reducing the capacitance, the inductance, or both.
		Resonant cavities have a very high Q and can be built to handle relatively large amounts of power.
		Although cavity resonators, built for different frequency ranges and applications, have a variety of shapes, the basic principles of operation are the same for all.
	www.fnrf.science.cmu.ac.th /theory/waveguide/Waveguide%20theory%2014.html (559 words)

	Cavity resonator : resonant cavity
		The resonant modes used are the transverse magnetic ones, TM et TM As shown in the Top Figure (or right-side figure) the cylinder-shaped (bar-like) sample is placed at the center of the cavity where the electrical field is maximum and quasi-constant over a radius of a few millimeters.
		The dielectric constant and the loss tangent are calculated from the variation of resonant frequency, Df, and from the change in the cavity quality factor, DQ, which both result from the presence of the sample inside the cavity.
		The main parameters are the respective volumes of the cavity and sample, the resonant frequencies as well as the quality factors of the cavity unloaded and loaded with the sample.
	www.univ-brest.fr /lest/caracterisation/pages/pages_anglais/cavitecylindrique.php?ref=6862 (357 words)

	The quality factor of a resonant cavity
		For a specific normal mode of the cavity this quantity is independent of the mode amplitude.
		For a constant input voltage, the energy of oscillation in the cavity as a function of frequency follows the resonance curve in the neighbourhood of a particular resonant frequency.
		for a particular mode, also determine the maximum amplitude of the oscillation when the resonance condition is exactly satisfied, as well as the width of the resonance (i.e.
	farside.ph.utexas.edu /teaching/jk1/lectures/node91.html (196 words)

	Olympus FluoView Resource Center: Stimulated Emission in a Laser Cavity - Interactive Java Tutorial
		Presented in Figure 1 is an illustration of the gain, or amplification, that occurs with increased path length in the resonant cavity due to the mirrors at each end.
		In a laser constructed with a longitudinal resonant cavity, such a ruby rod or a gas filled tube, light traveling along the length of the laser medium generates far more stimulated emission than the light emitted perpendicular to the long axis of the cavity.
		Light emission is therefore concentrated along the length of the cavity even without the use of mirrors to confine its path to the lengthwise direction.
	www.olympusfluoview.com /java/stimulatedemission (1043 words)

	3pPP3. Resonant cavity dependence of auditory-nerve fibers of the frog rana pipiens. (Site not responding. Last check: )
		Resonant cavity dependence of auditory-nerve fibers of the frog rana pipiens.
		Auditory electrophysiological experiments were conducted to study the hypothesis that sound transduction by frogs is dependent on the volume of a resonant cavity, which is made up of the middle ear, Eustachian tube, and mouth.
		Results show that the resonant cavity system used in vocalizing is also involved in sound transduction.
	www.auditory.org /asamtgs/asa97pen/3pPP/3pPP3.html (228 words)

	A Simple Asymmetric Resonant Cavity
		In this simplified analysis, we will treat the field in the cavity as a scalar field: that is, a real number associated with each point in space and time, rather than a vector.
		Rather than starting with a particular cavity, we will consider the standing waves that we can construct by a simple process of adding together a finite number of “plane waves” of equal wavelength, moving in different directions.
		Plane waves in three dimensions have a succession of parallel planes as their wavefronts (that is, their surfaces of constant phase); these planes are all orthogonal to the direction in which the wave is travelling.
	gregegan.customer.netspace.net.au /SCIENCE/Cavity/Simple.html (920 words)

	Vertical-cavity enhanced resonant thermal emitter invention
		A highly reflective mirror structure is positioned on another side of the cavity structure and acting as both the high-temperature source of radiation and a second mirror for the cavity structure.
		The initial motivation was to use an optical cavity resonance to resonantly enhance thermal radiation generated by fluctuating thermal sources in the cavity while suppressing it elsewhere.
		Ideally, the 1D PhC 4 and the cavity 8 are lossless, they are highly transparent in the range of wavelengths that are of interest, while the metallic mirror 6 is highly reflective yet slightly absorbing, thus acting as both the high-temperature source of radiation and the cavity 8 mirror.
	www.freshpatents.com /Vertical-cavity-enhanced-resonant-thermal-emitter-dt20060824ptan20060186357.php (1598 words)

	TechMatch
		applying a drive pulse of shorter duration than said pedestal voltage pulse to the resonant cavity oscillator during the application of said pedestal voltage application such that the resonant cavity oscillator is caused to output a radio frequency energy pulse of the same duration as the drive pulse and coherent with said injection signal.
		A method of producing pulsed coherent radio frequency energy according to claim 1 in which the coherent injection signal is of an amplitude and frequency having a predetermined relationship to the operating output power and frequency of the resonant cavity oscillator.
		drive signal source means effectively connected to said conditioning signal source means and to said resonant cavity oscillator for applying a trigger signal thereto in synchronism with said conditioning signal said trigger signal having a fast rise time and short duration as compared with said conditioning signal.
	www.navytechmatch.com /DOD/Patent/PatentDetail.aspx?type=claims&id=6914556&HL=ON (574 words)

	resonant cavity - OneLook Dictionary Search (Site not responding. Last check: )
		We found 2 dictionaries with English definitions that include the word resonant cavity:
		Tip: Click on the first link on a line below to go directly to a page where "resonant cavity" is defined.
		Resonant Cavity : Eric Weisstein's World of Physics [home, info]
	www.onelook.com /?w=resonant+cavity&ls=a (81 words)

	FM only: Low Tech FM Radios
		As the frequency of the FM signal moves toward the resonant frequency of the tuned circuit, the tuned circuit will let more of the signal pass through.
		Its oscillations are not near the resonant frequency of the input tuned circuit or antenna, so interference is substantially reduced.
		The tuner uses standard pipes to construct a resonant cavity, which is coupled to a crystal diode through an 1/8 wave coax transformer.
	www.somerset.net /arm/fm_only_lowtech.html (1922 words)

	India BigPatents -- METHOD AND SYSTEM FOR DISSIPATING AND AMPLIFYING NATURAL EMISSIONS FROM A RESONANT CAVITY
		The pheromone molecules are deposited in a resonant cavity that allows the generation of coherent and/or semi-coherent radiation.
		The molecular emissions are amplified in the resonant cavity and allowed to escape through a small circular opening on top of the resonant cavity.
		When the insect enters the resonant cavity, a trap door prevents the insect from exiting.
	india.bigpatents.org /view/10055/30ce4cc216d (170 words)

	Firecomms: RCLED Technology, Resonant Cavity Light Emitting Diodes
		Firecomms RCLEDs (Resonant Cavity Light Emitting Diodes) are high-speed light emitting diodes designed to operate at speeds up to 400 Mbps, eight times faster than conventional LEDs.
		Specifically designed to meet the specifications of POF data bus standards, such as IEEE 1394b and MOST, our RCLEDs offer all the attractive features of a conventional LED, plus high speeds, high temperature operation, and superior coupling efficiency into optical fiber due to a compact optical output.
		The RCLED’s cavity and thin active region combine to significantly increase both the extraction efficiency of light out of the front surface of the device and the maximum modulation frequency.
	www.firecomms.com /tech-RCLED.html (427 words)

	News--Crosslight Software Inc
		The multiple layer optical module has been enhanced to include resonant optical cavity calculation so that resonant cavity light emitting diode (RCLED) can be rigorously treated.
		Based on Green's function method, resonant effects in wavelength, angle of emission and standing wave have been included self-consistently with photon-recycling model.
		Organic semiconductor data base is much enhanced and the organic light emitting diode (OLED) option may now be combined with the resonant cavity option to provide more realistic modeling of an OLED.
	www.crosslight.com /News/news.htm (5246 words)

	Shively Labs FM Antennas and Accessories
		A station-specific balanced combiner module (right) consists of input hybrid, two four cavity or resonator bandpass filters, and an output hybrid.
		As a general rule, modules using interdigital filters are less expensive and take up considerably less floor space than their resonant cavity counterparts.
		Modules using resonant cavity filters have lower insertion losses in the filter portion of the module (the losses for the output hybrid/broadband line remain the same).
	www.shively.com /nav-balcombiners.php (971 words)

	DoD TechMatch: Patent View
		This invention relates generally to chemical oxygen-iodine lasers, and, more particularly to a repetitively pulsed chemical oxygen-iodine laser in which the threshold of the resonator is reduced by the incorporation therein of a scaleable intracavity gas phase Q-switch.
		In the photochemical iodine laser the population inversion is produced in the flash photolysis of a parent alkyl-iodide, generally C.sub.3 F.sub.7 --I or CF.sub.3 --I. The iodine atom that is produce in the photolysis process is in the upper laser level,.sup.2 P.sub.1/2.
		A repetitively pulsed chemical oxygen-iodine laser having a resonant cavity containing a lasing medium in the form of a flowing mixture of excited oxygen and iodine atoms and an iodine absorption region within the resonant cavity.
	www.armytechmatch.com /DOD/Patent/PatentView.aspx?id=6434174 (325 words)

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