Experimental characteristics of spatial subharmonics in BSO

Johansen, Per Michael; Hansen, René Skov; Olsen, Trine

doi:10.1016/0030-4018(94)00698-t

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…The apparent threshold of the subharmonic generation (related to the optical oscillation) is sensitive indeed to the sign of W ja 1 j 2 2 ja 2 j 2 . This feature explains the corresponding experimentally detected difference [19]. We expect that, by distinguishing between the apparent and genuine thresholds of the subharmonic generation, one can explain other still unclear features of this phenomenon [8,9].…”

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confidence: 71%

Critical Enhancement of Photorefractive Beam Coupling

Podivilov¹,

Sturman²,

Pedersen

et al. 2000

Phys. Rev. Lett.

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confidence: 71%

Critical Enhancement of Photorefractive Beam Coupling

Podivilov¹,

Sturman²,

Pedersen

et al. 2000

Phys. Rev. Lett.

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“…Our guess can only be that optical beam coupling has some influence in the dc case, too, as has been suggested already in the literature. 14,15 What is worth noting is that little emphasis has been made in investigating whether the subharmonic diffraction patterns were due to distinct gratings or narrow packages of gratings. In many cases 1,10,13,[16][17][18][19] a lens has been used to focus the diffracted beams, thus making it impossible to judge their structure.…”

Section: Discussionmentioning

confidence: 99%

Photorefractive subharmonics—a beam-coupling effect?

1998

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Using the so-called ac field technique, we investigate experimentally the influence of optical beam coupling on the generation of subharmonic gratings in a photorefractive sillenite crystal. By the use of two different recording configurations, we are able to distinguish between effects caused by material nonlinearities and effects caused by optical beam coupling. © 1998 Optical Society of America [S0740-3224(98)

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Space-Charge Wave Effects in Photorefractive Materials

Sturman

Springer Series in Optical Sciences

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This chapter provides the first systematic description of the basic properties of low-frequency space-charge waves (SCWs) in photorefractive materials, and the effects caused by these weakly damped eigen-modes. The basic properties incorporate the dependences of the wave frequency and damping on the wavevector, and the restrictions on the material parameters necessary to ensure weakness of the wave damping. The unifying feature of the SCW effects is their resonant character. These effects include the known DC and AC enhancement of the photorefractive response (treated as the linear resonance), the subharmonic generation (treated as parametric excitation of SCWs), the low-frequency peculiarities of the nonlinear response, and also a number of effects caused by the joint action of the optical and material nonlinearities. While an exposition of the concepts lies at the center of this chapter, it also gives a review of experimental studies relevant to the subject matter and a historical sketch.

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Experimental characteristics of spatial subharmonics in BSO

Cited by 6 publications

References 22 publications

Critical Enhancement of Photorefractive Beam Coupling

Critical Enhancement of Photorefractive Beam Coupling

Photorefractive subharmonics—a beam-coupling effect?

Space-Charge Wave Effects in Photorefractive Materials

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