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Terahertz radiation from shocked materials
Terahertz radiation from shocked materials

Adaptive Optics for Optical Coherence Tomography
Adaptive Optics for Optical Coherence Tomography

... Optical coherence tomography (OCT) [49] is a technique based on low coherence interferometry [7, 101] that is able to reconstruct tomographic (sectional) images of the object under study. It is usually implemented as a Michelson interferometer, in which the pattern of interference between the refere ...
Optical Autocorrelation using Non-Linearity in a Simple Photodiode
Optical Autocorrelation using Non-Linearity in a Simple Photodiode

Chapter 3: Electromagnetic Waves
Chapter 3: Electromagnetic Waves

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08 Waves Chapters 8_-_waves_combined

In the setup for the Borde-Chu Interferometer (BCI), the phase shift
In the setup for the Borde-Chu Interferometer (BCI), the phase shift

... In an atomic interferometer[1-8], the phase shift due to rotation is proportional to the area enclosed by the split components of the atom. In most situations, the atomic wavepacket is split first by what can be considered effectively as an atomic beam-splitter [9-13]. The split components are then ...
Multidimensional Spectroscopy of Semiconductor Quantum Dots
Multidimensional Spectroscopy of Semiconductor Quantum Dots

... reproduce 2DFT spectra of GaAs multiple quantum wells. With the FWM signal reflected from the sample surface instead of transmitted through, we show that very low pulse powers can be used to generate coherent 2D signals from colloidal PbS quantum dots. Dephasing times are particularly difficult to m ...
post-peer-review-non-publishers
post-peer-review-non-publishers

... (PML) is used to absorb reflections from the left, right and bottom boundaries. In addition, please note that, for a complete model, the EMATs result in the volume force for ultrasound generation; in this work, we use an approximated model with only the surface source to generate ultrasound waves, a ...
Transmission Lines - Text of NPTEL IIT Video Lectures
Transmission Lines - Text of NPTEL IIT Video Lectures

... beyond this the field would become very small. So what we can do is as the rule of thumb we can say that effectively the wave is going to propagate over this distance in this medium this is the effective length over which the propagation of the wave takes place from the beginning of the medium, what ...
Quantitative measurements of many-body exciton dynamics in GaAs
Quantitative measurements of many-body exciton dynamics in GaAs

Chapter 14
Chapter 14

CfE Advanced Higher Physics Unit 2: Quanta and
CfE Advanced Higher Physics Unit 2: Quanta and

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CfE Advanced Higher Physics Unit 2: Quanta and Waves

... This quantisation of angular momentum fitted in with the predicted energy levels, but left a crucial question unanswered. Why were these particular orbits allowed? In other words, what made this value of angular momentum so special, and why did having angular momentum of nh/2π make the orbit stable? ...
Chap1 P1 EM Waves
Chap1 P1 EM Waves

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Polarization

... • Input light converted to two polarized beams ...
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TE wave

... the TE01 by 20%. Find: (a) The sizes for a and b. (b) The operating wavelength, the phase velocity, the guide wavelength, and the wave impedance for the designed waveguide. Solution: (a) The cutoff wavelength of the TE10 wave is c  2a , and c c the cutoff frequency is f c   . The cutoff waveleng ...
A bound for the range of a narrow light
A bound for the range of a narrow light

OPTICAL PHENOMENA ASSOCIATED WITH BRAZIL
OPTICAL PHENOMENA ASSOCIATED WITH BRAZIL

Surface Waves
Surface Waves

... There are many different types of surface wave and each can be defined by the guiding structure required. Two potential types of surface wave have been identified that may be useful for both civil and military applications, namely the Zenneck surface wave and the trapped surface wave. Zenneck Surfac ...
Normal incidence – propagating waves
Normal incidence – propagating waves

... During t, the car travels a distance z; therefore, the velocity of the car can be estimated. The difference in arrival time for two pulses ...
Lecture 8: Reflection and Transmission of Waves
Lecture 8: Reflection and Transmission of Waves

Light Waves at the Boundary of Nonlinear Media
Light Waves at the Boundary of Nonlinear Media

Revision of Electromagnetic Theory Lecture 2
Revision of Electromagnetic Theory Lecture 2

Chapter 24
Chapter 24

< 1 2 3 4 5 6 7 8 ... 23 >

Coherence (physics)

In physics, two wave sources are perfectly coherent if they have a constant phase difference and the same frequency. It is an ideal property of waves that enables stationary (i.e. temporally and spatially constant) interference. It contains several distinct concepts, which are limiting cases that never quite occur in reality but allow an understanding of the physics of waves, and has become a very important concept in quantum physics. More generally, coherence describes all properties of the correlation between physical quantities of a single wave, or between several waves or wave packets. Interference is nothing more than the addition, in the mathematical sense, of wave functions. A single wave can interfere with itself, but this is still an addition of two waves (see Young's slits experiment). Constructive or destructive interferences are limit cases, and two waves always interfere, even if the result of the addition is complicated or not remarkable.When interfering, two waves can add together to create a wave of greater amplitude than either one (constructive interference) or subtract from each other to create a wave of lesser amplitude than either one (destructive interference), depending on their relative phase. Two waves are said to be coherent if they have a constant relative phase. The amount of coherence can readily be measured by the interference visibility, which looks at the size of the interference fringes relative to the input waves (as the phase offset is varied); a precise mathematical definition of the degree of coherence is given by means of correlation functions. Spatial coherence describes the correlation (or predictable relationship) between waves at different points in space, either lateral or longitudinal. Temporal coherence describes the correlation between waves observed at different moments in time. Both are observed in the Michelson–Morley experiment and Young's interference experiment. Once the fringes are obtained in the Michelson–Morley experiment, when one of the mirrors is moved away gradually, the time for the beam to travel increases and the fringes become dull and finally are lost, showing temporal coherence. Similarly, if in Young's double slit experiment the space between the two slits is increased, the coherence dies gradually and finally the fringes disappear, showing spatial coherence.
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