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

Ramazza, P. L.; Zhao, Mingjun

doi:10.1016/0030-4018(93)90478-n

Cited by 11 publications

(3 citation statements)

References 29 publications

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“…In 1990 the observation of enhanced photorefractive beam fanning because of the pyroelectric effect was reported. 6 Later the transient enhancement of amplification during two-wave mixing in Cu-doped KN SBN crystal was mentioned and attributed to pyroelectric fields, 7 but no detailed experimental results and analyses were given. More recently Korneev et al 8 observed an enhanced photorefractive grating by heating or cooling and by homogeneous illumination of a strontium barium niobate crystal with a cw laser.…”

Section: Introductionmentioning

confidence: 99%

Transient enhancement of photorefractive gratings in lead germanate by homogeneous pyroelectric fields

Mendricks

Nikolajsen

et al. 1999

J. Opt. Soc. Am. B

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During holographic recording in pure (Pb 5 Ge 3 O 11 ) and doped ͓(Pb 1Ϫx Ba x ) 5 Ge 3 O 11 ͔ lead germanate crystals, the diffraction efficiency is transiently enhanced at the initial stage. The enhancement is studied as a function of writing-beam intensity and of dark delay time between two successive recording processes and with open-or short-circuited crystal surfaces. Homogeneous pyroelectric fields that arise from heating of the crystals by cw illumination are revealed to be the main mechanism for diffraction efficiency enhancement. The combined effect of pyroelectric fields and charge compensation is analyzed and used for the explanation of the observed phenomena.

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Section: Introductionmentioning

confidence: 99%

Transient enhancement of photorefractive gratings in lead germanate by homogeneous pyroelectric fields

Mendricks

Nikolajsen

et al. 1999

J. Opt. Soc. Am. B

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“…1) charges up the two crystalline c faces and thus gives rise to a field which plays the same role as an applied electric field in most SS works. We remark that the pyroelectric effect of I i may have a contribution to the macroscopic field [25]. However, in view of the fact that the crystal can support stable PV SS [8], the PV contribution should be more important.…”

mentioning

confidence: 88%

All Optical Quasi-Steady-State Photorefractive Spatial Solitons

She¹,

Lee

2000

Phys. Rev. Lett.

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We have created a one- (rather than two-) dimensional quasi-steady-state photorefractive spatial soliton induced by a laser beam instead of an applied electric field. The formation of this type of spatial soliton depends on the intensity of the self-trapped beam, which is different from quasi-steady-state spatial solitons reported in the literature. The optically induced spatial soliton can be exploited in all optical switching applications.

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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: 99%

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

Cited by 11 publications

References 29 publications

Transient enhancement of photorefractive gratings in lead germanate by homogeneous pyroelectric fields

Transient enhancement of photorefractive gratings in lead germanate by homogeneous pyroelectric fields

All Optical Quasi-Steady-State Photorefractive Spatial Solitons

Beam fanning effect and image storage in Ce: KNSBN crystal

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