Diffraction efficiency enhancement of holographic gratings in Bi_12Ti_076V_024O_20 crystals after recording

Rickermann, F.; Riehemann, S.; Buse, K.; Dirksen, Dieter; Bally, Gert von

doi:10.1364/josab.13.002299

Cited by 15 publications

(4 citation statements)

References 18 publications

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“…The SE effect was reported for the first time in 1973 by Gaylord et al [4] for phase holograms in photorefractive LiNbO 3 :Fe crystals. It has been observed also in photochromic KBr crystals [5], sillenite-type photorefractive Bi 12 Ti 0.76 V 0.24 O 20 crystals [6], amorphous chalcogenide As-S, As-Se films [2] [3] [7], dichromated gelatin and polyvinyl alcohol films [8] and photopolymers [9]. Three types of SE can be distinguished: i) coherent SE due to the holographic recording by diffracted waves; ii) incoherent SE due to the contrast and/or transmission increase of a hologram by incoherent light; iii) relaxational (or dark) SE due to the contrast and/or transmission increase of a hologram by thermostimulated relaxation processes.…”

Section: Introductionmentioning

confidence: 93%

Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

Ozols¹,

Kokars²,

Augustovs³

et al. 2014

OPJ

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Self-enhancement (SE) effect of scalar and vector holographic gratings (HG) recorded in three different azobenzene molecular glassy films is experimentally studied in both transmission and reflection modes at 532 and 633 nm. The maximal SE factor (the ratio of diffraction efficiency to its initial value) SEF = 42 has been achieved. It is shown that the model of complementary HG can be applied also in scalar transmission thin HG case to explain coherent SE. The possibility of vector HG coherent SE in transmission mode is experimentally demonstrated for the first time (SEF = 4.3). The possibility of coherent HG SE in reflection mode is also established for the first time (SEF = 21). HG recording processes as well as coherent SE processes are found to be independent in transmission and reflection modes being determined by volume and surface relief HG, respectively. The permittivity gradient mechanism is proposed to explain the coherent SE of surface relief HG. Both HG recording and coherent SE efficiencies strongly decrease when HG period is decreased from 2 µm to 0.5 µm. No relaxational SE effect is found. Coherent SE effect in molecular glasses is found to be weaker than in inorganic materials.

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Section: Introductionmentioning

confidence: 93%

Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

Ozols¹,

Kokars²,

Augustovs³

et al. 2014

OPJ

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show abstract

“…[2,13]. SE of HG has also been reported in Bi 12 Ti 0.76 V 0.24 O 20 crystals [14] and dichromated poly(vinylalcohol) films [15].…”

Section: Introductionmentioning

confidence: 66%

Recording of holographic gratings and their coherent self-enhancement in an a-As2S3 film with a minimum light intensity modulation

Ozols¹,

Augustovs²,

Saharov³

2012

Lith. J. Phys.

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The holographic grating recording efficiency and the coherent self-enhancement efficiency of gratings are experimentally studied depending on the recording light interference fringe visibility in an a-As 2 S 3 chalcogenide film in order to find the minimum visibility. The minimum fringe visibility M min = 3.6×10-4 is found, which is determined by the scattered light background. In this case the maximal diffraction efficiency η max = 0.05% and the maximal self-enhancement factor ξ max = 5.0, compared to η max = 15% and ξ max = 12.3 in the optimal M = 1.0000 case. In the case of two-beam holographic grating recording the maximal diffraction efficiency increases when M is increased, whereas sensitivity decreases. A simple model, based on linear recording with the spatial light intensity distribution governed by M and including intensity-dependent material photosensitivity and grating relaxation, is proposed to explain these results. In the case of coherent self-enhancement both the maximal diffraction efficiency and sensitivity increase with fringe visibility M. This can be explained by the fact that mechanical stress modulation during the initial grating recording depending on M is followed by relaxational structural changes reinforcing the coherent self-enhancement effect. The developed approach may explain the absence of this effect in some azobenzene oligomer films.

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“…[2,13]. SE of HG has also been reported in Bi 12 Ti 0.76 V 0.24 O 20 crystals [14] and dichromated poly(vinylalcohol) films [15].…”

Section: Introductionmentioning

confidence: 67%

Recording of holographic gratings and their coherent self-enhancement in an a-As2S3 film with a minimum light intensity modulation

Ozols¹,

Augustovs²,

Saharov³

2012

Lith. J. Phys.

View full text Add to dashboard Cite

The holographic grating recording efficiency and the coherent self-enhancement efficiency of gratings are experimentally studied depending on the recording light interference fringe visibility in an a-As 2 S 3 chalcogenide film in order to find the minimum visibility. The minimum fringe visibility M min = 3.6×10 -4 is found, which is determined by the scattered light background. In this case the maximal diffraction efficiency η max = 0.05% and the maximal self-enhancement factor ξ max = 5.0, compared to η max = 15% and ξ max = 12.3 in the optimal M = 1.0000 case. In the case of two-beam holographic grating recording the maximal diffraction efficiency increases when M is increased, whereas sensitivity decreases. A simple model, based on linear recording with the spatial light intensity distribution governed by M and including intensity-dependent material photosensitivity and grating relaxation, is proposed to explain these results. In the case of coherent self-enhancement both the maximal diffraction efficiency and sensitivity increase with fringe visibility M. This can be explained by the fact that mechanical stress modulation during the initial grating recording depending on M is followed by relaxational structural changes reinforcing the coherent self-enhancement effect. The developed approach may explain the absence of this effect in some azobenzene oligomer films.

show abstract

Diffraction efficiency enhancement of holographic gratings in Bi_12Ti_076V_024O_20 crystals after recording

Cited by 15 publications

References 18 publications

Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

Self-Enhancement of Scalar and Vector Holographic Gratings in Azobenzene Molecular Glassy Films

Recording of holographic gratings and their coherent self-enhancement in an a-As<sub>2</sub>S<sub>3</sub> film with a minimum light intensity modulation

Recording of holographic gratings and their coherent self-enhancement in an a-As<sub>2</sub>S<sub>3</sub> film with a minimum light intensity modulation

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