Optical interferometry

Hariharan, P.

doi:10.1088/0034-4885/54/3/001

Cited by 40 publications

(13 citation statements)

References 208 publications

(76 reference statements)

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“…The concept of coherence came about when Thomas Young's double-slit optical experiment showed how interference patterns can arise as a result of coherence. With the development of interferometers, coherence has showed up in all wave-like fields from light [1] to acoustics [2]. The advent of quantum mechanics has placed additional responsibility on the doubleslit experiment in demonstrating wave-like nature in a variety of physical systems ranging from electrons [3,4] and neutrons [5].…”

Section: Introductionmentioning

confidence: 99%

Phonon coherence and its effect on thermal conductivity of nanostructures

Xie

Ding

Zhang

2018

Advances in Physics: X

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The concept of coherence is one of the fundamental phenomena in electronics and optics. In addition to electron and photon, phonon is another important energy and information carrier in nature. Without any doubt, exploration of the phonon coherence and its impact on thermal conduction will markedly change many aspects in broad applications for heat control and management in the real world. So far, the application of coherent effect on manipulation of phonon transport is a challenging work. In this article, we review recent advances in the study of the phonon coherent transport in nanomaterials and nanostructures. We first briefly look back the classical and quantum theory of coherence. Next, we review the progresses made in the understanding of phonon coherence in superlattice, nanowires and nanomeshes, respectively, and focus on the effect of phonon coherence on thermal conductivity. Finally, we introduce the recent advances in the direct detection of phonon coherence using optical coherence theory. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Phonon coherence and its effect on thermal conductivity of nanostructures

Xie

Ding

Zhang

2018

Advances in Physics: X

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“…The basic resolution of the laser interferometer corresponds to the wavelength of the laser source, but for many applications such an accuracy is insufficient. The resolution is further improved by various methods, commonly referred to as fringe subdivision or detection techniques [1,2]. …”

Section: Introductionmentioning

confidence: 99%

Detection of Interference Phase by Digital Computation of Quadrature Signals in Homodyne Laser Interferometry

Řeřucha

Buchta

Šarbort

et al. 2012

Sensors

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Abstract:We have proposed an approach to the interference phase extraction in the homodyne laser interferometry. The method employs a series of computational steps to reconstruct the signals for quadrature detection from an interference signal from a non-polarising interferometer sampled by a simple photodetector. The complexity trade-off is the use of laser beam with frequency modulation capability. It is analytically derived and its validity and performance is experimentally verified. The method has proven to be a feasible alternative for the traditional homodyne detection since it performs with comparable accuracy, especially where the optical setup complexity is principal issue and the modulation of laser beam is not a heavy burden (e.g., in multi-axis sensor or laser diode based systems).

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“…The father of optical interferometry was undoubtedly Michelson who gave contributions to interferometry during the half century from 1880 to 1930 dominated the field to such an extent that optical interferometry was regarded for many years as virtually a closed chapter [3] . However, the last three decades have seen a major resurgence of interest in this field.…”

Section: Introductionmentioning

confidence: 99%

“…The most important development was the invention of the laser, which made available, for the first time, an intense source of light with a remarkably high degree of spatial and temporal coherence. Lasers have removed most of the limitations of interferometer imposed by thermal sources and have made possible many new techniques [3] . The observation of beats produced when the beams from two lasers were mixed at a photodetector led to the development of a range of heterodyne methods for fringe interpolation.…”

Section: Introductionmentioning

confidence: 99%

Study of the Optical and Physical Roles of a Dielectric Laser Dye Solvent Which Affects on the Dye Laser Operation

Ghazy¹

2005

American J. of Applied Sciences

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Abstract:It is well known that when the pump laser beam incidence on the laser dye liquid it will be absorbed. This absorption tends to heat the laser active medium, which is the laser dye solution. In view of this the correlated property of that active medium well change tends to shift the operated frequency and wavelength. Therefore, one of most interested dielectric, nonpolar, laser dye solvent was selected for this investigation, which is Benzene. A laser interferometer known as Mach Zhender Interferometer (MZI) is constructed and used to measure the refractive index of the investigated solvent by counting the interfering fringes as a function of the angle of incidence of the incident laser beam. The temperature of that solvent is raised within the range 293-373 K by using a constructed heating system. The thermal behavior of the refractive index of Benzene is studied to estimate the thermo-optical coefficient of the refractive index, which is important to know the state convergence or divergence of the pump laser beam within the laser dye medium. Also, the dielectric constant of the dye solution is an important parameter for the laser operation. Therefore the dielectric constant and its thermal behavior of Benzene are calculated through the Maxwell's relation to determine the thermal coefficient of the dielectric constant. The value of the number density which is equal the specific polarizability of the investigated solvent is estimated by using the obtained values of the refractive index and its variation with the temperature is studied too. Because the dependence of the mean polarizability of the dielectric constant through the Clausius-Mossotti relation the values of both mean polarizability and its thermal behavior are studied. In addition, since the molecular polarizability depends on the mean polarizability the value of it is determined. By using the values of mean polarizability the molecule radius is determined and using the Clausius-Mossotti relation the actual volume occupied by all molecules per unit volume are estimated. The volume expansion, through Murphy and Albert equation is calculated.

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Optical interferometry

Cited by 40 publications

References 208 publications

Phonon coherence and its effect on thermal conductivity of nanostructures

Phonon coherence and its effect on thermal conductivity of nanostructures

Detection of Interference Phase by Digital Computation of Quadrature Signals in Homodyne Laser Interferometry

Study of the Optical and Physical Roles of a Dielectric Laser Dye Solvent Which Affects on the Dye Laser Operation

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