Dynamics of beam fanning in Cu-doped KNSBN

Residori, Stefania; Ramazza, P. L.; Zhao, Mingjun

doi:10.1016/0030-4018(93)90479-o

Cited by 8 publications

(2 citation statements)

References 16 publications

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“…As high gain photorefractive materials, doped KNSBN crystals had strong beam fanning effect and their two-wave coupling processes were more complicated. Thoroughly understanding the two-wave coupling process in doped KNSBN crystals has significant importance in applications such as volume holographic storage, optical information process and optical switch [6][7][8][9] . Among the experimental studies of doped KNSBN crystals, most of the reports focused on the steady two-wave coupling properties, while the reports of the dynamic properties were mainly theoretical simulation [10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

Dynamic properties of two-wave coupling in Ce:KNSBN crystal

Guo

Wei

et al. 2005

SPIE Proceedings

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In this experiment, the dynamic two-wave coupling properties of extraordinarily polarized He-Ne 632.8nm laser beam in a Ce:KNSBN crystal were studied with a real-time data-acquisition system. The transmitted pump beam intensity I p ' and the transmitted signal beam intensity I s ' were recorded as a function of time. While the incident beams of two-wave coupling are both with extraordinary polarization, a great fanning will generate and it would affect the two-wave coupling dynamic properties. The dynamic evolution of two-wave coupling had great differences while the total incident beam intensity and the incident beam intensity ratio were different. The coupled-wave equations were modified according to the beam-fanning threshold phenomena and the experimental data. The theoretical calculation results obtained from the modified coupled-wave equations were agree with the experimental data very well.

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Section: Introductionmentioning

confidence: 99%

Dynamic properties of two-wave coupling in Ce:KNSBN crystal

Guo

Wei

et al. 2005

SPIE Proceedings

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“…Currently, the beam fanning effect in doping KNSBN has been elementarily researched, too. Residori et al [4] investigated the dynamic process of the beam fanning effect in Cu:KNSBN crystal at different c axis; Ramazza et al [5] considered that the resolving power of two waves coupling volume grating was strongly effected by the beam fanning; Zhang et al [6] made use of the ordinary component of the pump beam as an incoherent beam to erase the fanning in Ce:KNSBN, and the gain of two waves coupling was enhanced; Guo et al [7] researched the fanning effect on the dynamics of two waves coupling in Ce:KNSBN crystal. However, the problems that the quality of the holographic storage is damaged by the beam fanning noise, etc.…”

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confidence: 98%

Beam fanning effect and image storage in Ce: KNSBN crystal

Guo

Wang

et al. 2007

Chin. Sci. Bull.

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A non-synchronously-numerating experimental system is applied in this research. The effect of the incident beam intensity I and the beam incident angle θ on beam fanning effect is investigated with a singular beam incident on Ce:KNSBN crystal. The results show that the beam fanning effect strongly depends on I and θ. The threshold effect of I for the beam fanning in Ce:KNSBN crystal is observed, and the threshold intensity of incident beam keeps the same value of 38.2 mW/cm 2 for different θ, and the steady beam fanning intensity I fsat reaches a peak at θ=15° under the same I. In addition, the effect of the incident beam modulated on the beam fanning noise and holographic storage in Ce:KNSBN crystal is studied. And the results suggest that the beam fanning noise is effectively suppressed, and the quality of the reappearance image is greatly improved.Ce:KNSBN crystal, beam fanning effect, threshold characteristic, image storageThe beam fanning effect, which can be observed in almost all photorefractive crystals, strongly impedes the progress of holographic volume storage in high-gain photorefractive crystals. Recently, the beam fanning in LiNbO 3 crystal is minutely studied. Liu et al. [1] proposed that the intensity of beam fanning in LiNbO 3 crystal was toned up by doping with Fe element; Zhang et al. [2] believed that the beam fanning effect of LiNbO 3 :Fe crystal could be suppressed by doping with Mg ion; Zhang et al. [3] reported that the intensity threshold of the beam fanning of LiNbO 3 :Fe crystals could be reduced by doping with damage-resistant dopants (Mg 2+ , Zn 2+ , In 3+ ). Currently, the beam fanning effect in doping KNSBN has been elementarily researched, too. Residori et al. [4] investigated the dynamic process of the beam fanning effect in Cu:KNSBN crystal at different c axis; Ramazza et al. [5] considered that the resolving power of two waves coupling volume grating was strongly effected by the beam fanning; Zhang et al. [6] made use of the ordinary component of the pump beam as an incoherent beam to erase the fanning in Ce:KNSBN, and the gain of two waves coupling was enhanced; Guo et al. [7] researched the fanning effect on the dynamics of two waves coupling in Ce:KNSBN crystal. However, the problems that the quality of the holographic storage is damaged by the beam fanning noise, etc. were not resolved as yet. In this research, the beam fanning effect as functions of the incident beam intensity and beam incident angle was studied with 532 nm beam incident on Ce:KNSBN crystal, and the beam fanning noise and holographic storage in Ce:KNSBN crystal were investigated, in the case where beam is modulated, and the corresponding explanations are given.

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Experimental study of two-wave mixing amplification in Cu-doped KNSBN

Ramazza

Zhao

1993

Optics Communications

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Dynamics of beam fanning in Cu-doped KNSBN

Cited by 8 publications

References 16 publications

Dynamic properties of two-wave coupling in Ce:KNSBN crystal

Dynamic properties of two-wave coupling in Ce:KNSBN crystal

Beam fanning effect and image storage in Ce: KNSBN crystal

Experimental study of two-wave mixing amplification in Cu-doped KNSBN

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