DFWM of focused laser beams in a-As2S3 and azobenzene oligomer films

Saharov, D.; Ozols, Andris

doi:10.1007/s10854-008-9639-8

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…(8) that if |γ max | < |γ min |, certain combinations of the parameters γ max , γ min and M CSE can prevent CSE if the expression in the first brackets is zero. We have observed such unusual recording sensitivity dependence on light intensity in azobenzene oli go mer [4-((4-nitrophenyl)diazenyl)-N, N-bis (2-(tetrahydro-2H-pyran -2 yloxy)ethyl) benzena mi ne] films [22]. However, further studies are needed to clarify these points.…”

Section: Resultsmentioning

confidence: 84%

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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Section: Resultsmentioning

confidence: 84%

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.

Self Cite

View full text Add to dashboard Cite

show abstract

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.

Self Cite

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

DFWM of focused laser beams in a-As2S3 and azobenzene oligomer films

Cited by 2 publications

References 7 publications

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

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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