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Topic: Cutoff wavelength

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Waveguide

Cutoff frequency

	Cutoff Wavelength (Site not responding. Last check: 2007-10-09)
		The wavelength at which a mode ceases to propagate is called the cutoff wavelength for that mode.
		Cutoff wavelength may be measured on uncabled or cabled single mode fibers.
		Since the procedures for measuring the cutoff wavelength of uncabled and cabled single mode fibers are essentially the same, only the test method for measuring the cutoff wavelength of uncabled fiber is discussed.
	www.tpub.com /neets/tm/109-4.htm (670 words)

	Ridged Waveguide and Transitions
		In this document, formulae for cutoff wavelength and impedance are established for dual and single ridge waveguides and two examples are provided that illustrate the application to ridge transition design from waveguide to microstrip using a single ridge structure.
		The procedure for establishing the cutoff wavelength is that of Marcuvitz [1] pp 399 - 400 and pp 307 - 308 and includes the proximity corrections of Pyle [2].
		Although a closed form approximation for cutoff wavelength is available [3], it is observed that it retains a small error in cut off wavelength (~ 2%) as the tapered ridge vanishes at the waveguide port.
	www.mathcad.com /Library/LibraryContent/MathML/singleridge.htm (464 words)

	Waveguide Mathematics- Microwave Encyclopedia - Microwaves101.com
		The lower cutoff for WR90 is calculated as 6.56 GHz.
		Guide wavelength is defined as the distance between two equal phase planes along the waveguide.
		The guide wavelength is a function of operating wavelength (or frequency) and the lower cutoff wavelength, and is always longer than the wavelength would be in free-space.
	www.microwaves101.com /encyclopedia/waveguidemath.cfm (728 words)

	NASA Observatorium Education-Reference Module (Site not responding. Last check: 2007-10-09)
		The shorter-wavelength cutoff is just below the peak transmittance of clear water, while the upper-wavelength cutoff is the limit of blue chlorophyll absorption for healthy green vegetation.
		Wavelengths below 0.45 m are substantially influenced by atmospheric scattering and absorption.
		The 0.69 m cutoff represents the beginning of a spectral region from 0.68 to 0.75 m where vegetation reflectance crossovers occur that can reduce the accuracy of vegetation studies.
	observe.arc.nasa.gov /nasa/education/reference/tm/tm_2.html (384 words)

	Common Terms
		Wavelength at the centre of the pass band measured at the half of the peak transmittance point.
		Wavelength at which a filter begins/ ceases to transmit.
		A measure of the transmittance cuton or cutoff slope.
	www.spectrogon.com /filtersterms.html (161 words)

	Cutoff wavelength - Wikipedia, the free encyclopedia
		single-mode optical fiber, the wavelength greater than which a particular waveguide mode ceases to be a bound mode.
		The cutoff wavelength is usually taken to be the wavelength at which the normalized frequency is equal to 2.405.
		: The cabled cutoff wavelength is usually considered to be a more functional parameter because it takes into consideration the effects of cabling the fiber.
	en.wikipedia.org /wiki/Cutoff_wavelength (98 words)

	IEC: Fiber-Optic Technology (Site not responding. Last check: 2007-10-09)
		It is a function of wavelength, core diameter, and the refractive-index difference between the core and the cladding.
		Cutoff wavelength is the wavelength above which a single-mode fiber supports and propagates only one mode of light.
		The effective cutoff wavelength of a fiber is dependent on the length of fiber and its deployment and the longer the fiber, the lower the effective cutoff wavelength.
	www.iec.org /online/tutorials/fiber_optic/topic06.html (1438 words)

	Surface Metrology Guide - Filtering (Site not responding. Last check: 2007-10-09)
		For most useftil filters the attenuation is a ftinction of the frequency or wavelength of the input, so the frequency response of a filter is a (complicated) flinction of attenuation (often expressed as percent) versus wavelength.
		At the longest wavelengths the phase lag reaches 180°; the output of the filter is precisely out of phase with the input.
		The cutoff is chosen to give at least two periods of the surface in each sample length.
	www.predev.com /smg/filtering.htm (2917 words)

	CHP - Electromagnetic Spectrum (Site not responding. Last check: 2007-10-09)
		The visible region of the electromagnetic spectrum consists of photons with wavelengths from approximately 400 to 700 nm.
		The short wavelength cutoff is due to absorption by the lens of the eye and the long wavelength cutoff is due to the decrease in sensitivity of the photoreceptors in the retina for longer wavelengths.
		Light at wavelengths longer than 700 nm can be seen if the light source is intense.
	www.chem.vt.edu /chem-ed/light/em-spec.html (262 words)

	Section 2
		The cutoff wavelength [[lambda]]c, where the spectral response on the long wavelength side is at 50 percent of peak, depends on the temperature of the detector.
		The maximum detector temperature for BLIP operation is a function of cutoff wavelength and background flux levels: the longer the cutoff wavelength, the colder the detector must be.
		For a wavelength of 12 um, the index of refraction of germanium is n = 4.
	rsd.gsfc.nasa.gov /goes/text/MITRE-GOES_MP93W62/sec2.html (11398 words)

	Quality Scan
		Cutoff wavelength is the wavelength below which the data will be eliminated when applying a linear Gauss filter.
		Cutoff frequency is the number of undulations per revolution (UPR) in the data above which the data will be reduced when applying a polar Gauss filter.
		When using UPR for circular features as compared with wavelength, the benefit is that, for all circles, the number of periods for an occurring error waveform can be expressed as a function of a full 360º revolution around the circle.
	www.sme.org /gmn/mag/2005/05fem004/05fem004.html (690 words)

	NIFS Cryostat Thermal Emission
		The cutoff wavelength of the potential HAWAII-2 CdZnTe detector is not known, but is expected to be ~ 5.5 mm.
		Implementation of a 5.5 mm cutoff detector in NIFS can be accomplished by cooling the cryostat enclosure to below 90 K and cooling the final element of the spectrograph camera (i.e., the silica field flattener) and the detector enclosure to below 65 K. Temperature Dependence
		Consequently, the shift of the transmission profile of silica to longer wavelengths at lower temperatures is unlikely to affect the use of a silica field flattener as a blocking filter when used with a 5.5 mm cut-off detector.
	msowww.anu.edu.au /nifs/sdns/sdn0004.10.htm (630 words)

	Sensors Unlimited, Inc. - What is InGaAs?
		This "long wavelength cutoff" works out to 3.75 µm for InAs and 0.55 µm for GaP with InP at 0.96 µm and GaAs at 0.87 µm.
		Relationship between the lattice constant and the long wavelength cutoff of the 4 ternary alloys in the InGaAsP family are shown in Figure 1.
		The lattice constants and long wavelength cutoffs of these alloys are depicted as the red lines in Figure 1.
	www.sensorsinc.com /GaAs.html (717 words)

	Waveguides and Cavity Resonators
		The field pattern is formed from the superposition of two plane waves travelling in different directions, (the two directions are plus and minus alpha with respect to the direction along the waveguide).
		Thus the cutoff frequency for the TE10 mode is the lowest frequency at which the waveguide will transmit without attenuation.
		Calculate the cutoff frequency of a waveguide formed by the BB21 corridor, assumed to be 3 metres high and 2 metres wide.
	www.ee.surrey.ac.uk /Personal/D.Jefferies/wguide.html (3250 words)

	Ch 01 (Site not responding. Last check: 2007-10-09)
		They occur at the wavelength value that corresponds to the wavelength of the X-ray photon that was emitted when an electron from the outer shell of the atom in the target material drops down to the K-shell.
		The wavelengths of the characteristic lines depend on the target material; the cutoff wavelength, however, is independent of the target material and depends only on the energy of the impinging electrons.
		Therefore, the cutoff wavelength depends on the value of V, and not on the composition of the target material used in the X-ray tube.
	www.emory.edu /PHYSICS/Faculty/Benson/142/concepts4/CQ30.htm (2154 words)

	Definition: cutoff wavelength (Site not responding. Last check: 2007-10-09)
		In an uncabled single-mode optical fiber, the wavelength greater than which a particular waveguide mode ceases to be a bound mode.
		(188) Note 1: The cutoff wavelength is usually taken to be the wavelength at which the normalized frequency is equal to 2.405.
		Note 2 : The cabled cutoff wavelength is usually considered to be a more functional parameter because it takes into consideration the effects of cabling the fiber.
	www.its.bldrdoc.gov /fs-1037/dir-010/_1376.htm (85 words)

	Mercury Cadmium Telluride Detectors
		HgCdTe is a ternary semiconductor compound which exhibits a wavelength cutoff proportional to the alloy composition.
		The wavelength of peak response depends on the material's band-gap energy and can easily be varied by changing the alloy composition.
		Standard cutoff wavelengths for J15TE2 Series devices are 4.0 µm, 4.5 µm and 5.0 µm.
	www.judtech.com /mercadm.htm (2210 words)

	[No title]
		The long wavelength point at which the detector responsivity has fallen to a specified percent of the peak responsivity.
		Cutoff wavelength is usually specified at 20% or 50% of peak.
		Defined with respect to a particular chopping frequency, wavelength and effective noise bandwidth.
	judsontechnologies.com /Glossary.htm (420 words)

	Problems Three (Site not responding. Last check: 2007-10-09)
		The cutoff wavelength for the TE10 mode is twice the longest cross section dimension.
		The wave impedance of a waveguide mode is defined as the ratio of the transverse component of electric field strength to the transverse component of magnetic field strength.
		For a TE mode, the electric field is wholly transverse and the same as it is in a free space wave.
	www.ee.surrey.ac.uk /Personal/D.Jefferies/probs3.html (602 words)

	Journal of Electronic Materials: Advances in comparison control for 16 mm LPE P-on-n HgCdTe heterojunction photodiodes ... (Site not responding. Last check: 2007-10-09)
		First, in this spectral region the cutoff wavelength is a very sensitive function of the composition of the base layer.
		For a recent lot of 18 wafers with an average cutoff wavelength of 15.1,um at 58K, the within-wafer standard deviation of x was 0.0003 (0.15% of the mean; 0.09 llm in cutoff wavelength).
		Similarly, for a second lot of ten wafers with an average cutoff wavelength of 17.9 Mm at 58K, the within-wafer standard deviation of x was 0.0004 (0.20% of the mean; 0.14 gm in cutoff wavelength).
	www.findarticles.com /p/articles/mi_qa3776/is_199906/ai_n8837391 (1519 words)

	Wavelength Division Multiplexing - WDM - Tutorial - NI Developer Zone - National Instruments
		A wavelength router is essentially an optical demultiplexer that directs different wavelengths to different points instead of to different receivers.
		The precise selection of wavelengths transmitted and reflected, and the shape of the reflection and transmission curves, depend on details of filter design including thicknesses and compositions of the layers, and the numbers of layers in the "stack." Normally the more layers, the finer the resolution, and the narrower the range of wavelengths selected.
		Cutoff filters are designed to make a sharp transition between transmitting and reflecting at a certain wavelength.
	zone.ni.com /devzone/conceptd.nsf/webmain/15847D6977D4B94C86256C2B00742432 (6862 words)

	World Intellectual Property Organization (Site not responding. Last check: 2007-10-09)
		In particular, the present invention relates to a single mode fiber dual wavelength band design that is able to operate in tight bend environments with minimal bend induced losses while having a mode field diameter (MFD) that matches large mode-field diameter fibers such as common long haul telecommunications fibers.
		An exemplary operating wavelength range is between 1300 to 1550 nm and a second mode cutoff wavelength of less than 1300 nm.
		Figure 3 is a graph of attenuation vs. wavelength as a function of bend radius for the fiber having the profile illustrated in Figure 2.
	www.wipo.int /ipdl/IPDL-CIMAGES/view/pct/getbykey5?KEY=03/107054.031224&ELEMENT_SET=DECL (5054 words)

	E&477 Lab #3 - Spectral Attenuation Measurements
		The optimum wavelength of an optical fiber communication system requires determination of the spectral loss of the fiber.
		In addition to minimum loss, the singlemode system should operate at a wavelength near the fiber's next higher mode effective cutoff to enhance fundamental mode confinement.
		However, the actual dispersion of wavelength in nm/mm varies with wavelength and the size of the slit openings.
	ece.uwaterloo.ca /~ece477/Labs/Lab3.html (1069 words)

	Det Terms
		Wavelength at which detector D* has degraded to one half of its peak value.
		It is defined as the frequency at which detector signal decreases to 0.707 of its maximum value when it is exposed to a square wave pulse of radiation.
		It is mainly a function of detector temperature, wavelength, chopping frequency and bias, and
	www.electro-optical.com /bb_rad/det_term.htm (713 words)

	RIDGED CAVITY ANALYSIS
		We showed that this is obtained by lowering the cutoff frequency of the TE mode through the use of ridges.
		Fortunately we are interested in the cutoff frequency of the TE mode which is related to the resonant frequency of the TE cavity mode.
		The cutoff frequency of a ridged waveguide is a parameter, which in itself is dependent only upon the cross sectional dimensions of the guide.
	www.ecs.umass.edu /mie/labs/mda/fea/fealib/moser/anlysis3.htm (3080 words)

	LEOT Laser Tutorial - Course 4: Laser Electronics - Module 8: Optical Detectors (Site not responding. Last check: 2007-10-09)
		When the wavelength is longer than the cutoff wavelength, the photon energy is too small to liberate an electron and the response of the detector drops to zero.
		Therefore, the value of D* increases, reaching a maximum at the cutoff wavelength, which is equal to the Planck’s constant times the velocity of light divided by the band gap of the material.
		Because the photodiode response varies with wavelength, the manufacturer usually supplies a calibration graph to allow conversion to wavelengths other than that for which the photodiode was calibrated.
	repairfaq.ece.drexel.edu /sam/CORD/leot/course04_mod08/mod04-08.html (11228 words)

	Filterless Si-Based Ultraviolet-Selective Photodetectors
		These devices could serve as ultraviolet sensors in such instruments as hydrogen- and hydrocarbon-flame detectors, dosimeters for monitoring exposure to ultraviolet in industrial processes, and instruments for measuring ultraviolet in sunlight to monitor the ozone content of the upper atmosphere.
		The depth at which the insulating layer is buried determines the thickness of the active upper section and thus, as described below, affects the wavelength selectivity of the device.
		The long-wavelength cutoff (the maximum wavelength for photons to excite photocurrent) and the quantum efficiency of the device as a function of wavelength depend on the thickness (or the thicknesses of the sublayers) of the upper section of the substrate and on band gap(s) of the photodiode material(s) (Si and/or SiC).
	www.nasatech.com /Briefs/Mar00/SSC00072.html (588 words)

	CCL.NET 2002.10.31-005
		You could check the definition of 'cutoff wavelength' to see whether it means 0.1%, 1% or 10% of full intensity, etc. Generally, data collected below the solvent cutoff would be considered unreliable.
		The problem is that as you get beyond the cutoff wavelength, you still aren't going to get enough light through the blank to allow for a really proper correction.
		Generally, one doesn't scan beyond the cutoffs of the equipment, whether this is the cufoff of the optics, the glassware (quartz in your case, I suspect, but Pyrex will do for > 290 or so), or the solvent.
	www.ccl.net /cgi-bin/ccl/message.cgi?2002+10+31+005 (808 words)

	Journal of Electronic Materials: HgTe/HgCdTe Superlattices Grown on CdTe/Si by Molecular Beam Epitaxy for Infrared ... (Site not responding. Last check: 2007-10-09)
		Theoretically, the detectors need to be cooled to about 180 K to 20 K for cutoff wavelengths varying from the midwavelength infrared (MWIR) to very long wavelength infrared (VLWIR) region, respectively.
		The Auger recombination rate strongly depends on the carrier concentration (increases as the square of the carrier concentration at low and moderate concentrations and at a slower rate at higher concentrations when carriers are degenerate).
		At these wavelengths, HgCdTe has a very narrow bandgap, and any small variation in the Cd mole fraction translates into a large variation in the cutoff wavelength.
	www.findarticles.com /p/articles/mi_qa3776/is_200406/ai_n9433482 (1389 words)

	Forthcoming Paper (Site not responding. Last check: 2007-10-09)
		: within a time-dependent Ginzburg-Landau formulation, we phenomenologically introduce a short wavelength cutoff (of the order of the inverse coherence length) in the fluctuational spectrum to suppress high momentum modes.
		the cutoff has no effect, and the known results for Gaussian fluctuations are recovered.
		At high epsilon the cutoff effects are dominant.
	www.edpsciences.org /articles/epjb/forth/abstracts/silva.html (167 words)

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