Analysis of double phase conjugate mirror interaction in absorbing photorefractive crystals: Application to BGO:Cu

Wolffer, N.; Gravey, P.; Moisan, J.Y.; Laulan, C.; Launay, J.C.

doi:10.1016/0030-4018(89)90170-3

Cited by 28 publications

(7 citation statements)

References 19 publications

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“…In the model for large signal effect, the transmission of the probe beam, in the case of undepleted pump, is given by [14] : 2). The value we find for the coefficient a (a=2.7) is coherent with the data obtained in other kinds of materials like BGO [15], whose photorefractive parameters (N eff , µτ, ...) have similar values. All measurements shown on the other curves are conducted with a high pump to probe beam ratio in order to limit this large signal effect.…”

Section: Discussionsupporting

confidence: 89%

Photorefractive response of CdTe: V under ac electric field from 1 to 1.5 μm

Belaud

Delaye

Launay³

et al. 1994

Optics Communications

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The AC field technique leading to the enhancement of the photorefractive effect is applied to Vanadium-doped Cadmium Telluride. Net photorefractive gain is obtained for the three wavelengths studied : 1.06µm, 1.32µm and 1.55µm. We observed a change in the sign of the photorefractive gain between 1.06µm and 1.55µm, which represents the first evidence of an electron-hole competition in this material. Theoretical interpretation is performed using an extension of the AC field theoretical model with bipolar conduction.

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Section: Discussionsupporting

confidence: 89%

Photorefractive response of CdTe: V under ac electric field from 1 to 1.5 μm

Belaud

Delaye

Launay³

et al. 1994

Optics Communications

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“…Néanmoins cette résolution basée sur le système (6.5) ne prend pas en compte les non-linéarités de l'effet photoréfractif qui sont obtenues aux forts taux de modulation. Pour les prendre en compte, seule une résolution numérique est appropriée [136,137]. On montre que ces non-linéarités diminuent l'efficacité du dispositif.…”

Section: Miroirs Autopompésunclassified

“…En fait, l'expérience a montré que très souvent la diffusion de la lumière est suffisamment importante pour que le dispositif démarre avec son seul miroir. Cela est confirmé par l'analyse numérique menée dans [136].…”

Section: Miroirs à Cavités Linéaires Et Semi-linéairesunclassified

L'effet photoréfractif

Pauliat

Roosen

1998

l'Optique Non Linéaire Et Ses Matériaux

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Résumé : La souplesse d'emploi des matériaux photoréfractifs est un de leurs principaux attraits. Un même échantillon est sensible sur une plage de longueurs d'onde de plus de 100 nm avec des temps de réponse s'étageant de moins d'une nanoseconde à plus d'une seconde en fonction de la puissance optique mise en jeu. Cette richesse explique le succès de l'effet photoréfractif et aussi les centaines de publications annuelles sur ce sujet. De nombreux matériaux photoréfractifs aux caractéristiques très diverses sont disponibles commercialement. Bien qu'il ne soit pas possible de résumer ici l'ensemble de ces résultats, nous présentons les notions indispensables à la compréhension de ce phénomène nonlinéaire, à l'utilisation de ces matériaux, et au choix des échantillons. Nous n'abordons pas le vaste domaine des applications.

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“…The role of various impurity cations in the photorefractive properties of crystalline Bi 12 MO 20 has been also investigated by various spectroscopy methods [8][9][10][11][12][13][14]. Of special interest are the impurity paramagnetic transition metal ions (TMIs) such as: V 4+ , Cr 3+ , Mn 2+ / Mn 4+ , Fe 3+ , Co 2+ , Cu 2+ , which can be investigated by magneto-optical and EMR techniques.…”

Section: Introductionmentioning

confidence: 99%

Revealing the Cu2+ ions localization at low symmetry Bi sites in photorefractive Bi12GeO20 crystals doped with Cu and V by high frequency EPR

Nistor

Stefan

Goovaerts

et al. 2015

Journal of Magnetic Resonance

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The sites of incorporation of Cu(2+) impurity ions in Bi12GeO20 single crystals co-doped with copper and vanadium have been investigated by electron paramagnetic resonance (EPR). While the X-band EPR spectra consist of a simple broad (ΔB ∼50 mT) line with anisotropic lineshape, the W-band EPR spectra exhibit well resolved, strongly anisotropic lines, due to transitions within the 3d(9)-(2)D ground manifold of the Cu(2+) ions. The most intense group of lines, attributed to the dominant Cu(2+)(I) center, displays a characteristic four components hyperfine structure for magnetic field orientations close to a 〈110〉 direction. The g and A tensor main axes are very close to one of the 12 possible sets of orthogonal 〈1-10〉, 〈00-1〉 and 〈110〉 crystal directions. Several less intense lines, with unresolved hyperfine structure and similar symmetry properties, mostly overlapped by the Cu(2+)(I) spectrum, were attributed to Cu(2+)(II) centers. The two paramagnetic centers are identified as substitutional Cu(2+) ions at Bi(3+) sites with low C1 symmetry, very likely resulting from different configurations of neighboring charge compensating defects.

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Analysis of double phase conjugate mirror interaction in absorbing photorefractive crystals: Application to BGO:Cu

Cited by 28 publications

References 19 publications

Photorefractive response of CdTe: V under ac electric field from 1 to 1.5 μm

Photorefractive response of CdTe: V under ac electric field from 1 to 1.5 μm

L'effet photoréfractif

Revealing the Cu2+ ions localization at low symmetry Bi sites in photorefractive Bi12GeO20 crystals doped with Cu and V by high frequency EPR

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