Mode-coupling analysis of depolarization effects in a multimode optical fiber

Yu, Lukang; Rawat, Banmali S.

doi:10.1109/50.136088

Cited by 14 publications

(6 citation statements)

References 11 publications

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“…It is therefore important to ensure that the spectrometer receives depolarised light only. While this can be achieved by adding a diffusing component between the polarizer and the spectrometer, the simplest method is to use a long, looped multimode optical fibre, as internal stresses in the coiled optic fibre help depolarize the beam along the fibre’s length (Yu and Rawat 1992 ). Our measurements suggest that a minimum of 2 m of coiled fibre are required to eliminate this artefact (see supplement S2 ).…”

Section: How Polarised Light Is Measuredmentioning

confidence: 99%

Polarisation vision: overcoming challenges of working with a property of light we barely see

Foster

Temple

How

et al. 2018

Sci Nat

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In recent years, the study of polarisation vision in animals has seen numerous breakthroughs, not just in terms of what is known about the function of this sensory ability, but also in the experimental methods by which polarisation can be controlled, presented and measured. Once thought to be limited to only a few animal species, polarisation sensitivity is now known to be widespread across many taxonomic groups, and advances in experimental techniques are, in part, responsible for these discoveries. Nevertheless, its study remains challenging, perhaps because of our own poor sensitivity to the polarisation of light, but equally as a result of the slow spread of new practices and methodological innovations within the field. In this review, we introduce the most important steps in designing and calibrating polarised stimuli, within the broader context of areas of current research and the applications of new techniques to key questions. Our aim is to provide a constructive guide to help researchers, particularly those with no background in the physics of polarisation, to design robust experiments that are free from confounding factors.

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Section: How Polarised Light Is Measuredmentioning

confidence: 99%

Polarisation vision: overcoming challenges of working with a property of light we barely see

Foster

Temple

How

et al. 2018

Sci Nat

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“…The spectrometer is polarization sensitive, so accurate HRS polarization measurements require an effective depolarizer placed before the spectrometer. The length scale for polarization mode mixing in a step index optical fiber is about 10 m, 25,26 so the 2 m long spectrometer input fiber only partially depolarizes the light. The residual output polarization with linear polarized input light is measured by r = I max /I min , the ratio of maximum and minimum intensity transmitted through a linear polarizer placed at the fiber output.…”

Section: Hrs Experimentsmentioning

confidence: 99%

“…(a) Radial pair distribution functions for acetonitrile from molecular dynamics simulations (µ = 3.96 D, solid red; µ = 4.64 D, dashed blue). Correlation functions for (b) µ = 3.96 D and (c) µ = 4.64 D, with longitudinal (blue curves) and transverse (red curves) orientation correlation functions from the MD simulations (solid curves), compared with functions given by Eqs (25). and(26) with a from Eq.…”

mentioning

confidence: 99%

What is measured by hyper-Rayleigh scattering from a liquid?

Rodriquez

Shelton

2018

The Journal of Chemical Physics

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Polarization and angle dependence of hyper-Rayleigh scattering (HRS) measured for liquid acetonitrile and dimethyl sulfoxide (DMSO) is analyzed in terms of contributions from randomly oriented molecules and additional contributions produced during intermolecular collisions and induced by the electric field of dissolved ions. All three contributions show the effect of long-range correlation, and the correlation functions are determined using the HRS observations combined with the results of molecular dynamics simulations. HRS from acetonitrile is polarized transverse to the scattering vector. This is due to long-range molecular orientation correlation produced by the dipole-dipole interaction, and correlation at distances r > 100 nm must be included to account for the HRS observations. Analysis of the HRS measurements for acetonitrile determines the length scale a = 0.185 nm for the long-range longitudinal and transverse orientation correlation functions B=-2B=a/r. Transverse polarized collision-induced HRS is also observed for acetonitrile, indicating long-range correlation of intermolecular modes. Strong longitudinal HRS is induced by the radial electric field of dissolved ions in acetonitrile. For DMSO, the angle between the molecular dipole and the vector part of the first hyperpolarizability tensor is about 100°. As a result, HRS from the randomly oriented molecules in DMSO is nearly unaffected by dipole correlation, and ion-induced HRS is weak. The strong longitudinal polarized HRS observed for DMSO is due to the collision-induced contribution, indicating long-range correlation of intermolecular modes. The HRS observations require correlation that has r long-range asymptotic form, for molecular orientation and for intermolecular vibration and libration, for both acetonitrile and DMSO.

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“…It is therefore important to ensure 571 that the spectrometer receives depolarized light only. While this can be achieved by 572 adding a diffusing component between the polarizer and the spectrometer, the simplest 573 method is to use a long, looped multimode optical fibre, as internal stresses in the 574 coiled optic fibre help depolarize the beam along the fibre's length (Yu & Rawat, 1992). 575…”

Section: Spectral Characterisation 561mentioning

confidence: 99%

Polarization Vision—Overcoming Challenges of Working with a Property of Light We Barely See

Foster¹,

Temple

How

et al. 2017

Preprint

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In recent years, the study of polarization vision in animals has seen numerous breakthroughs, not just in terms of what is known about the function of this sensory ability, but also in the experimental methods by which polarization can be controlled, presented and measured. Once thought to be limited to only a few animal species, polarization sensitivity is now known to be widespread across many taxonomic groups, and advances in experimental techniques are, in part, responsible for these discoveries. Nevertheless, its study remains challenging, perhaps because of our own poor sensitivity to the polarization of light, but equally as a result of the slow spread of new practices and methodological innovations within the field. In this review, we introduce the most important steps in designing and calibrating polarized stimuli, within the broader context of areas of current research and the applications of new techniques to key questions. Our aim is to provide a constructive guide to help researchers, particularly those with no background in the physics of polarization, to design robust experiments that are free from confounding factors.

show abstract

Mode-coupling analysis of depolarization effects in a multimode optical fiber

Cited by 14 publications

References 11 publications

Polarisation vision: overcoming challenges of working with a property of light we barely see

Polarisation vision: overcoming challenges of working with a property of light we barely see

What is measured by hyper-Rayleigh scattering from a liquid?

Polarization Vision—Overcoming Challenges of Working with a Property of Light We Barely See

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