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Topic: Transverse mode


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  Transverse mode - Wikipedia, the free encyclopedia
Yup A transverse mode of a beam of electromagnetic radiation is a particular intensity pattern of radiation measured in a plane perpendicular (i.e.
Transverse modes occur in radio waves and microwaves confined to a waveguide, and also in light waves in an optical fibre and in a laser's optical resonator.
Transverse modes occur because of boundary conditions imposed on the wave by the waveguide.
en.wikipedia.org /wiki/Transverse_mode   (760 words)

  
 Mode - Wikipédia
Dina statistik, mode nyaeta nilai nu mibanda angka observasi panggedena, disebut nilai atawa nilai nu pangremenna bijil.
Modes are written in Emacs's LISP, and all modes may not be included with all versions.
In acoustics, a mode is one of the possible patterns of vibration, analogous to waveguide and cavity modes, only that electrical and magnetical fields are replaced by velocity and displacement.
su.wikipedia.org /wiki/Mode   (352 words)

  
 Transverse wave - Wikipedia, the free encyclopedia
Transverse waves travel slower than longitudinal waves (which include sound, ripples in water, and certain types of waves from earthquakes, where the particle motion is in the direction of travel), and propagate only in solids, not in liquids or gases.
In seismology transverse waves are called S (for “secondary”) waves as they arrive later than the P (“primary”) waves from an earthquake.
In mathematics, transverse waves are associated with the curl operator and are governed by a vector wave equation, in contrast to longitudinal waves, which are associated with the div operator and are governed by a scalar wave equation.
en.wikipedia.org /wiki/Transverse_wave   (326 words)

  
 Apparatus and method of removing occlusions using ultrasonic medical device operating in a transverse mode - US Patent ...   (Site not responding. Last check: 2007-10-21)
A "transverse wave" as used herein is a wave propagated along an ultrasonic probe in which the direction of the disturbance at each point of the medium is perpendicular to the wave vector.
The mode of vibration of the ultrasound probe according to the invention differs from the axial mode of vibration which is conventional in the prior art.
In one embodiment of the invention, the transverse mode ultrasonic medical device, is used in a procedure to remove an occlusion from a small diameter vessel (e.g., a native vessel, or a grafted vessel).
www.patentstorm.us /patents/6652547.html   (8488 words)

  
 TRANSVERSE ELECTROMAGNETIC MODE
A mode in which both the longitudinal components of the electric and magnetic field strength vectors are everywhere zero.
modo TEM (principal mode, TEM mode), modo elettromagnetico trasverso (principal mode, TEM mode), modo elettromagnetico (electromagnetic mode, mode, principal mode, TEM mode), modo elettrico e magnetico trasversale (principal mode, TEM mode).
modo transversal electromagnético (principal mode, TEM mode), modo TEM (principal mode, TEM mode).
www.websters-online-dictionary.org /definition/TRANSVERSE+ELECTROMAGNETIC+MODE   (150 words)

  
 Transverse Laser Modes
The superimposed waveforms that form the mode move with a fixed velocity that is dependant on the properties of the string, and have wavelengths equal to 2L/n, where L is the length of the string, and n is a positive integer.
The transverse modes determine the intensity distributions on the cross-sections of the beam.
An HG mode appears to be a grid of dots, or blobs.
laser.physics.sunysb.edu /~alex/tmodes/webreport.html   (2178 words)

  
 Stripe offset geometry in injection lasers to achieve transverse mode control - Patent 4251780
Since the beam is not confined in the active region to the center of the width of the stripe geometry, the beam itself prevents the residual gain at the wings of the stripe to approach or exceed the gain at the center of stripe by shifting and stimulating the residual injected carriers to recombine.
These modes however act to reduce residual gain and the totality of modes because of their mutual coupling or cooperative interrelation can be considered to be a stable "mode" of the offset stripe laser.
In the straight sections 60 and 62 of the waveguide in the active layer 46, the mode position is stabilized because the displaced beam in the curved section 58 is not aligned relative to the center of the straight sections 60 and 62.
www.freepatentsonline.com /4251780.html   (4446 words)

  
 Tuning a Marimba
The first transverse mode of the marimba bar is tuned to the fundamental, the second transverse mode is tuned to the fourth harmonic and the third transverse mode is tuned to the tenth harmonic.
The antinodes for the second transverse mode of vibration (tuned to the fourth harmonic) are on both sides of the bar center, so removal of material there results in a more flexible bar in the locations where this mode requires maximum flexing.
A mode is brought forth by holding the bar at a position that coincides with a node (a location where the bar does not vibrate in that specific mode).
www.lafavre.us /tuning-marimba.htm   (7397 words)

  
 Testing - Cal Poly shake table tests   (Site not responding. Last check: 2007-10-21)
The second response was observed as a transverse rocking motion in the direction of the ground excitation with the symmetric pivot points located at the contact point of the second level rack and the top of the bottom level barrels.
This behavior was observed in the third response mode of each of the 4 heights of barrel stacks during the testing.
Although the stacks did not topple or collapse, this response mode is likely due to the geometry of the rack supports and the low energy levels required to rock the barrels and toss them from the stack.
www.eresonant.com /pages/testing/cpsu-shaketest2.html   (1376 words)

  
 Professor A. E. Siegman: Research Interests   (Site not responding. Last check: 2007-10-21)
These efforts were focused on understanding the transverse mode properties of semiconductor diode lasers, including methods for applying unstable optical resonator concepts to diode lasers in order to obtain high-power diffraction-limited operation.
We also explored the oscillation modes of reactive-ion-etched "stadium resonator" diode lasers in order to compare their transverse mode properties with the well-known chaotic properties of rays and modes in the classical billiard model studied by nonlinear dynamicists.
As a result, the transverse modes of these system are no longer "normal" (i.e., orthogonal0 modes as commonly employed in most areas of physics, but rather are biorthogonal in character.
www.stanford.edu /~siegman/aes_past_research.html   (517 words)

  
 United States Patent Application: 0030031442
Each such transverse mode is a specific transverse pattern or transverse intensity profile for the radiation traveling within the fiber.
Each mode will maintain its characteristic transverse pattern unchanged with distance as the radiation travels along the fiber, assuming that the fiber is ideal and has no bends, kinks, or defects.
A lowest-order or fundamental mode 28 is hatched and corresponds to radiation 22 propagating in a gaussian intensity distribution centered on fiber axis FA.
www.stanford.edu /~siegman/gain_guided_fiber_patent.html   (8506 words)

  
 Overview Article: Photonic Crystals   (Site not responding. Last check: 2007-10-21)
The temporal behavior and emission spectra of multi-stripe lasers that can be observed in experiments are the result of a complex interplay of transverse modes dynamically interacting with each other via the active medium and via the light fields propagating in longitudinal direction of the resonator.
However, the longitudinal and transverse dimensions of the twin-stripe laser enable the coexistence of numerous longitudinal and transverse modes.
In its final state (t ~ 6 ns), the laser shows a regular transverse migration of the light intensity between the stripes which can be identified with a higher-order transverse mode.
www.ee.surrey.ac.uk /Research/CQE/research/semilaser/twinstripe.html   (572 words)

  
 LEOT Laser Tutorial - Course 10: Laser/Electro-Optic Measurements - Module 5: Fabry-Perot Interferometers   (Site not responding. Last check: 2007-10-21)
For example, in holography, several modes oscillating simultaneously in a laser limit the coherence length of the laser beam and, thus, limit the depth of field of the hologram made with that laser.
The length of the laser cavity may have to be adjusted somewhat to ensure that the mode of the laser coincides with a transmission maximum of the etalon.
Use the interferometer to determine the longitudinal mode spacing of the helium-neon laser and the number of longitudinal modes which are lasing.
repairfaq.ece.drexel.edu /sam/CORD/leot/course10_mod05/mod10-05.html   (4108 words)

  
 LEOT Laser Tutorial - Course 1: Introduction to Lasers - Module 9: Spatial Characteristics of Lasers   (Site not responding. Last check: 2007-10-21)
(2) This module discusses (1) transverse electromagnetic modes in lasers and how they can be controlled, (2) methods for the determination and control of laser­beam divergence, and (3) methods for the determination of beam diameter at a known distance from the laser or at the focal point of a lens.
The electric fields of two modes within the cavity of a vertically polarized laser are depicted in Figure 2.
mode" because it is the only transverse mode in which all the light is in one phase at any given time.
repairfaq.ece.drexel.edu /sam/CORD/leot/course01_mod09/mod01-09.html   (3693 words)

  
 Passive Alignment Techniques for Optoelectronic Transmitter Arrays   (Site not responding. Last check: 2007-10-21)
An eigenmode analysis of the transverse refractive index profile of the laser structure was used to determine the propagating mode.
The function of the mode transformer is to alter the shape and size of the beam from the active device to closely match that of the fiber.
The use of alignment tolerant semiconductor lasers using intrinsically large modes or mode transformers together with a solderboss technique and v-grooves in silicon is a very promising approach for passive alignment of lasers to single-mode fibers.
www.ee.umd.edu /photonics/papers/spie/SPIE97.htm   (2971 words)

  
 Ultrasonic medical device operating in a transverse mode - US Patent 6551337   (Site not responding. Last check: 2007-10-21)
A method according to claim 38 or 39, wherein the step of generating the transverse ultrasonic vibration in the length of the flexible member is accomplished by providing an ultrasonic vibration to the proximal end of the flexible member.
As used herein, a transverse mode of operation is used to describe a flexible probe with a plurality of nodes and anti-nodes along the length of the probe.
The transverse mode probe is capable of maintaining its vibration when bent if the sum of the stresses imposed by the transverse vibration and the bending stresses do not exceed the elastic limit of the material.
www.patentstorm.us /patents/6551337.html   (5339 words)

  
 Transverse-mode stabilized semiconductor laser diode with slab-coupled waveguide - Patent 4799228
In such a GaAlAs laser with a slab-coupled waveguide, transverse mode oscillation is carried out in such a manner that oscillated laser light is shut up in the groove by refractive index guiding, which is due to the difference between refractive indexes measured at the groove and the other portion of the multi-layer structure.
In order to obtain a stabilized transverse mode in a laser diode,.DELTA.neff which compensates for refractive index reduction caused by the plasma effect and the like, is required, and it was experimentally found that the stabilized fundamental transverse mode can be obtained when.DELTA.neff is about 10.sup.-2.
In the actual operation mode of the laser diode, these factors tend to be varied depending upon the layer structure, the gain distribution, the internal power loss of the laser diode.
www.freepatentsonline.com /4799228.html   (4624 words)

  
 Sam's Laser FAQ - Helium-Neon Lasers
Even though two modes are oscillating, the gain for each one is so much closer to the lasing threshold that their combined power is still lower than for the single mode at the peak of the gain curve.
Mode locking is a technique which converts this CW beam to a periodic series of very short pulses with a length anywhere from picoseconds to a fraction of a nanosecond.
Mode locking is implemented by mounting one of the mirrors of the laser cavity on a piezo-electric or magnetic driver controlled by a feedback loop which phase locks it with respect to the optically sensed output beam.
repairfaq.cis.upenn.edu /sam/laserhen.htm   (21076 words)

  
 electric anomalies, transverse mode noise, common mode noise,high frequency interferences   (Site not responding. Last check: 2007-10-21)
Common mode noise attenuation measured by means of the same method used for a R.F. filter.
Common mode noise attenuation measured by means of a 0,01 mF capacitor (measuring method used for an isolation transformer).
Transverse mode noise attenuation measured by means of the same method used for a RFI filter.
www.irem.it /en/Epc/EPCatten.htm   (117 words)

  
 IUGG 2003 Scientific Program
This is the reason why the transverse roll convection was notfound by Davies-Jones (1971), in which convection after a infinitelylong time has passed is examined.The mechanism of the transformation is investigated by linearanalysis.
By this formulation, the perturbation is separated into thetransverse mode (that is sheared by the background flow) and theparallel mode, and the governing equations change from partial toordinary differential equations for perturbation amplitude withrespect to time.
As a consequence,the transverse mode dominates over the parallel mode.The present result might explain some aspects of transverse rollconvection observed in the atmosphere of planets such as in theJupiter.
www.olympus.net /IAPSO/abstracts03/JSP10/04/020339-1.html   (405 words)

  
 United States Patent Application: 0020181536
The VCSEL operates predominantly in the single fundamental transverse mode, emitting a laser output having a peak intensity at its center.
The vertical cavity surface emitting laser of claim 13, wherein a gain area for the laser oscillation is increased for high-power oscillation of a fundamental transverse mode by increasing at least one of an aperture of laser oscillation, the effective diameter of the feedback member, and a radius of curvature of the feedback member.
For these reasons, a variety of approaches to suppress multiple transverse modes and improve the output power of the single transverse mode oscillation in the index-guided VCSEL have been suggested.
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='20020181536'.PGNR.&OS=DN/20020181536&RS=   (2660 words)

  
 MPS- SHIELDING AND NOISE ATTENUATION
The Transverse Mode noise is transferred to the secondary winding by intercoupling due to changes in the transformers core flux density and is sometimes referred to as "Intercoupling" noise.
Transverse Mode noise may be greatly attenuated by decreasing the leakage inductance of the transformer windings.
Transverse Mode noise attenuation varies with changes in the frequency of the noise.
www.marelco.com /an/an13.htm   (869 words)

  
 Definition for word(s) transverse mode - The Photonics Directory   (Site not responding. Last check: 2007-10-21)
A mode that has a field vector normal to the direction of propagation.
In a transverse electric mode (TE), the electric field vector is normal; in a transverse magnetic mode (TM), the magnetic field vector is normal.
In the transverse electromagnetic mode (TEM), both the electric and magnetic field vectors are normal to the propagation direction.
www.photonics.com /dictionary/lookup/XQ/ASP/url.lookup/entrynum.5405/pu./letter.t/QX/lookup.htm   (128 words)

  
 TRANSVERSE ELECTRIC MODE
A normal mode in which the longitudinal component of the electric field strength vector is everywhere zero and the longitudinal component of the magnetic field vector is not everywhere zero.
mode TE, mode H, mode électrique transverse, mode électrique.
modo transversal eléctrico (H mode, TE mode), modo TE (H mode, TE mode), modo H (H mode, TE mode).
www.websters-online-dictionary.org /definition/TRANSVERSE+ELECTRIC+MODE   (171 words)

  
 Phonons in Diamond -- Point 2 -- X
One of the modes is longitudinal (vibrations parallel to the wavevector, here in the (001) direction), while the others are transverse (vibrations perpendicular to the wavevector, here in the [001] plane).
Supercell frozen phonon calculations require the vibrations to fit in a unit cell whose reciprocal lattice is such that the wave-vector of the phonon is a lattice vector of the reciprocal lattice.
From this we deduce that the angular frequency of the mode is
cst-www.nrl.navy.mil /~mehl/phonons/diamond/point02   (652 words)

  
 Definition: transverse magnetic mode   (Site not responding. Last check: 2007-10-21)
transverse magnetic (TM) mode: A mode whose magnetic field vector is normal to the direction of propagation.
Note: TM modes may be useful in waveguides.
In an optical fiber, TE and TM modes correspond to meridional rays.
www.atis.org /tg2k/_transverse_magnetic_mode.html   (54 words)

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