Interferometric determination of the birefringence dispersion of anisotropic materials

Medhat, M.; El-Zaiat, S.Y.

doi:10.1016/s0030-4018(97)00239-3

Cited by 35 publications

(23 citation statements)

References 9 publications

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“…One of the most simple spectral interferometric techniques used to measure the phase birefringence dispersion is based on the observation of spectrally resolved interference fringes (channelled spectrum) in a set-up with an anisotropic optical material placed between a polarizer and an analyser [2,3]. The channelled spectrum originates from the interference of the polarization eigenvawes propagating through the anisotropic material illuminated with a collimated beam.…”

Section: Introductionmentioning

confidence: 99%

“…The technique is usable for both uniaxial and biaxial anisotropic crystals and it enables one to determine the phase birefringence dispersion from the positions of maxima in a channelled spectrum. The fringe order as a function of wavelength is fitted to a prescribed function [2,3] from which the phase birefringence dispersion is retrieved for the crystal of known thickness. Similarly, the phase birefringence of a prescribed dispersion can be measured in a set-up with a Mach-Zehnder interferometer using fitting the measured spectrum to the theoretical one [4].…”

Section: Introductionmentioning

confidence: 99%

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Birefringence dispersion in a quartz crystal retrieved from a channeled spectrum resolved by a fiber-optic spectrometer

Hlubina

Ciprián

2011

Optics Communications

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We present a simple method for measuring the wavelength dependence of both the phase and group birefringence in a quartz crystal of known thickness. The method utilizes interference of polarized waves resolved by a fibre-optic spectrometer as a channelled spectrum (spectral fringes). The fringe order versus the precise position of the interference maximum in the spectrum is fitted to the approximate function, from which the phase birefringence as a function of wavelength is retrieved. We also determine the group birefringence dispersion. The functions measured in a range from 500 to 900 nm are compared with those resulting from the available dispersion relation, and very good agreement is confirmed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Birefringence dispersion in a quartz crystal retrieved from a channeled spectrum resolved by a fiber-optic spectrometer

Hlubina

Ciprián

2011

Optics Communications

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“…Neste sentido, já foi mostrado que transparências para retroprojetores apresentam birrefringência e podem ser utilizadas como lâminas defasadoras. 7,9 Isto se dá porque no processo de fabricação são utilizados processos de fusão e estiramento de material plástico, o que produz anisotropia estrutural que causa a birrefringência óptica.…”

Section: Birrefringência Linear De Um Filme De Transparênciaunclassified

Utilização de um espectrógrafo de projeção como uma ferramenta para demonstrações sobre polarização da luz

Azevêdo¹,

Faria²,

Batalhão³

et al. 2010

Quím. Nova

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Recebido em 17/11/09; aceito em 19/1/10; publicado na web em 12/5/10 PROJECTION SPECTROGRAPH AS A TOOL FOR LIGHT POLARIZATION CLASSROOMS DEMONSTRATIONS. This article describes the use of a projection spectrograph based on an overhead projector for use in classroom demonstrations on light polarization and optical activity. A simple adaptation on a previously developed apparatus allows illustrating several aspects of optical activity, such as circular and linear birefringence, including their wavelength dependence. Specifically, we use the projection spectrograph to demonstrate the optical activity of an aqueous solution of sugar (circular birefringence), of a quartz plate and of an overhead projector transparence film (linear birefringence). A historical survey about the optical activity discovery and the main principles involved is also presented.Keywords: projection spectrograph; optical activity; birefringence. INTRODUÇÃOA propagação da radiação eletromagnética e mais especificamente da luz visível em um meio material depende de características específicas deste meio. Assim, o estudo das modificações sofridas pela luz ao se propagar em um meio traz informações importantes sobre as características atômicas do mesmo. Por exemplo, medindo-se a intensidade de luz absorvida por um material em cada comprimento de onda (espectro de transmissão), pode-se obter informações sobre a sua composição química. No entanto, um feixe luminoso ao atravessar um meio material não sofre somente alteração em suas características espectrais, mas pode também sofrer alteração em seu estado de polarização. Essas alterações são usadas em várias aplicações tecnológicas, por exemplo, o valor comercial da cana-de-açúcar é avaliado com base na sua concentração de sacarose, que é determinada utilizando um método que envolve a avaliação das mudanças na direção da polarização da luz ao atravessar uma solução (polarimetria). Já uma aplicação científica comum que envolve a análise da polarização da luz é a técnica denominada dicroísmo circular que, entre outras aplicações, é utilizada para o estudo da estrutura secundária de proteínas.Em artigo anterior, foi apresentado um aparato baseado em um retroprojetor com o qual é possível realizar várias demonstrações experimentais envolvendo os processos de emissão e absorção da luz.1 Neste artigo, serão apresentadas novas aplicações onde o mesmo aparato é utilizado para demonstrações dos principais conceitos envolvendo polarização da luz. Com o uso do retroprojetor modificado e um acessório proposto é possível analisar a atividade óptica de materiais como função do comprimento de onda, por exemplo, o estudo das propriedades de birrefringência linear e circular dos materiais. Além disso, o uso do retroprojetor com fonte de luz permite que as demonstrações sejam realizadas para um grande número de estudantes. Histórico das descobertas sobre a polarização da luzO primeiro fenômeno relacionado com o que viria a ser chamado de polarização da luz foi relatado em 1669 pelo dinamarquês Erasmo Bartholin, que obs...

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“…Similarly, the birefringence dispersion is of fundamental importance for anisotropic materials used in optical devices such as wave plates, compensators, retarders and polarizers. Measurement of the phase birefringence of a prescribed dispersion function can be performed by spectral interferometric techniques based on either determining the positions of maxima in a channeled spectrum [6] or by fitting the measured spectrum to the theoretical one [7].In this Letter, a simple method for retrieving the wavelength dependence of the phase birefringence in a PMF of known length is presented. The technique, which is based on processing of a channeled spectrum to retrieve the phase function, utilizes the approximative function of the phase birefringence dispersion.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

Absolute phase birefringence dispersion in polarization-maintaining fiber or birefringent crystal retrieved from a channeled spectrum

Hlubina

Ciprián

2010

Opt. Lett.

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We report on a simple method for retrieving the wavelength dependence of the phase birefringence in a polarization-maintaining fiber or a birefringent crystal from a channeled spectrum. The method utilizes interference of polarized modes or waves resolved as the channeled spectrum and its processing by a windowed Fourier transform to reconstruct precisely the phase as a function of wavelength. The ambiguity of the phase is removed provided that we know both the approximative function for the birefringence dispersion and the length of the fiber or the thickness of the crystal. The method is used in measuring the wavelength dependence of the phase birefringence in an elliptical-core fiber or in a quartz crystal in a range from 500 to 900 nm. The dependences are compared with those resulting from the available data, and very good agreement is confirmed. c 2010 Optical Society of America OCIS codes: 060.2300, 060.2420, 120.3180, 260.1180, 260.1440, 260.2030 Highly-birefringent, polarization-maintaining fibers (PMFs) have attracted considerable interest for a number of applications, including e.g. polarizationsensitive optical devices and fiber-optic sensors of various physical quantities employing interferometric techniques. For these applications, it is important to know the birefringence dispersion, i.e., the wavelength dependence of the phase and group birefringence in the PMFs. Several methods have been developed to measure the phase birefringence in PMFs over a wide spectral range. A wavelength scanning technique can be applied to either short [1] or long [2] fibers. It is well known that scanning the wavelength alone (a channeled spectrum) gives only a relative measure of the phase birefringence and it inherently measures the group birefringence. The absolute phase birefringence is obtained by both scanning the wavelength and absolutely measuring the birefringence at one particular wavelength. To measure this quantity, a precision electromagnetic modulation technique [1] or a lateral force method [3] applied in the time [4] or wavelength [5] domain can be used. Similarly, the birefringence dispersion is of fundamental importance for anisotropic materials used in optical devices such as wave plates, compensators, retarders and polarizers. Measurement of the phase birefringence of a prescribed dispersion function can be performed by spectral interferometric techniques based on either determining the positions of maxima in a channeled spectrum [6] or by fitting the measured spectrum to the theoretical one [7].In this Letter, a simple method for retrieving the wavelength dependence of the phase birefringence in a PMF of known length is presented. The technique, which is based on processing of a channeled spectrum to retrieve the phase function, utilizes the approximative function of the phase birefringence dispersion. We extended the use of the technique for measuring the phase birefringence in a quartz crystal of known thickness. Consider a PMF supporting two polarization modes over a broad spectral range. We ca...

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Interferometric determination of the birefringence dispersion of anisotropic materials

Cited by 35 publications

References 9 publications

Birefringence dispersion in a quartz crystal retrieved from a channeled spectrum resolved by a fiber-optic spectrometer

Birefringence dispersion in a quartz crystal retrieved from a channeled spectrum resolved by a fiber-optic spectrometer

Utilização de um espectrógrafo de projeção como uma ferramenta para demonstrações sobre polarização da luz

Absolute phase birefringence dispersion in polarization-maintaining fiber or birefringent crystal retrieved from a channeled spectrum

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