1989
DOI: 10.1364/ol.14.001359
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Influence of alternating field frequency on enhanced photorefractive gain in two-beam coupling

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Cited by 23 publications
(15 citation statements)
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“…The space charge field is expected to increase with ac electric field frequency near the grating formation rate and maintain a maximum value, independent of frequency, until T ac approaches the free carrier lifetime. We have found that under certain experimental conditions the frequency dependence is quite different than the predictions of the existing model [1][2][3]. 1.…”
contrasting
confidence: 61%
See 1 more Smart Citation
“…The space charge field is expected to increase with ac electric field frequency near the grating formation rate and maintain a maximum value, independent of frequency, until T ac approaches the free carrier lifetime. We have found that under certain experimental conditions the frequency dependence is quite different than the predictions of the existing model [1][2][3]. 1.…”
contrasting
confidence: 61%
“…The usual constraint is that the period of the applied field r ac be much less than the grating formation time τ 8 . This frequency dependence was verified in BGO [ 3 ]. A calculated frequency dependence of the normalized space charge field (E x /m) for BSO for r g = 100 ms is shown in Fig.…”
supporting
confidence: 60%
“…(5) in Ref. [25]) allows to determine both modulus and phase of the crystal response time τ (Table 1). Since αx < 1, τ 0 is obtained from τ 0 = τ·e -αx/2 [13].…”
Section: Discussionmentioning
confidence: 99%
“…Nous verrons dans le chapitre 5 que l'application d'un champ alternatif de haute fréquence augmente de façon importante le rapport AI B [61][62][63] et conduit à l'obtention de champs de charge d'espace de valeurs plus importantes. Néanmoins, pour la plupart des expériences, ce rapport est usuellement très faible.…”
Section: Régime Transitoireunclassified
“…L'application d'un champ électrique continu fait migrer les charges de façon dissymétrique ce qui rompt le déphasage de 0 ou n entre le réseau d'illumination et le réseau de champ (i.e de ±n/2 entre le réseau d'illumination et le réseau d'indice). Pour néanmoins conserver ce déphasage on peut songer à appliquer un champ électrique alternatif de période longue devant la constante de temps de recombinaison des charges r K , pour les forcer à migrer, et courte devant la constante de temps photorefractive pour maintenir le déphasage de ±TT/2 entre le réseau d'illumination et le réseau d'indice [61,98,99].…”
Section: Principeunclassified