Characterization of uniaxial crystals through the study of fringe patterns

Veiras, Francisco E.; Pérez, Gervasio; Garea, María Teresa; Perez, Liliana I.

doi:10.1088/1742-6596/274/1/012030

Cited by 11 publications

(10 citation statements)

References 6 publications

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“…The measurement methods are generally divided into two types: reflection and transmission. It has been shown in a previous communication [4] that a conoscopic measurement by transmission provides information about a crystal sample. As a starting point, plane-parallel uniaxial crystal samples are studied.…”

Section: Introductionmentioning

confidence: 98%

“…However, its current importance in diverse fields of science and technology has reencouraged this challenge. Nowadays, high quality liquid crystal displays, spatial light modulators, and birefringent devices demand better characterization [1][2][3][4] and modeling [5,6]. Moreover, current trends in technology and science require wide angle illumination systems.…”

Section: Introductionmentioning

confidence: 99%

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Wide angle conoscopic interference patterns in uniaxial crystals

2012

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The fringe pattern obtained when a divergent (or convergent) beam goes through a sample of birefringent crystal between two crossed polarizers contains information that is inherent to the crystalline sample under study. The formation of fringe patterns is analyzed from distinct approaches and with different degrees of approximation considering cones of light of large numerical aperture. We obtain analytic explicit formulas of the phase shift on the screen and compare them with the exact numerical solution. The results obtained are valid for arbitrary orientation of the optical axis and are not restricted either to low birefringence or to small angles of incidence. Moreover, they enable the extraction of the main features related to the characterization of uniaxial crystal slabs, such as the optical axis tilt angle and the principal refractive indices.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Wide angle conoscopic interference patterns in uniaxial crystals

2012

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“…Laser conoscopy has acquired particular informativity for the study of fine structural distortions, both intrinsic and induced by laser radiation in photorefractive nonlinear optical crystals. It has become possible to use laser conoscopy for the study of subtle features of the structure, photorefraction effect, nonlinear optical effects in combination with other research methods: Raman scattering of light, photoinduced (photorefractive) light scattering, electron spectroscopy, etc., significantly complementing the data of these methods [10][11][12][13][14][15][16][17][18][19][20].…”

Section: Experimental Methodsmentioning

confidence: 99%

Control of Optical Homogeneity of Lithium Niobate Crystals with Admixtures of Rare-Earth Elements Gd, Er by Laser Conoscopy

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2020

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Interference patterns of single crystals of LiNbO3:Gd, LiNbO3:Er, obtained by laser conoscopy, allow us to estimate the optical homogeneity of the samples under study. The observation of conoscopic patterns of the LiNbO3:Gd single crystal shows that with an increase in the percentage impurity concentration, the anomalous biaxiality in these samples manifests itself to a much greater degree. Anomalous biaxiality for the sample LiNbO3:Er [3.60 wt.%] is present at almost every point of the entrance face, which is manifested in conoscopic patterns in the form of enlightenment and rupture of the “Maltese cross”, which corresponds to the angle 2V~1° between the anomalous axes.

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“…Experiments were conducted based on the modification of traditional wide-angle conoscopic interference equipment. 29,30 The specific equipment used in experiment is shown in Fig. 4.…”

Section: Crystengcomm Papermentioning

confidence: 99%