Effect of photoconductivity and oscillation frequency shift on the signal beam intensity in two beam coupling in photorefractive materials

Yadav, Tarun; Maurya, Mukesh Kumar; Yadav, R.A.

doi:10.1016/j.ijleo.2010.10.011

Cited by 7 publications

(3 citation statements)

References 22 publications

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“…According to the analysis above, the gain non-uniformity in the signal beam, which indicates the unevenness for image enhancement, is induced by the difference in spatial frequency in the beam. As seen in Equations (11)(12)(13)(14), the factors, which impact on the unevenness of gain in the signal beam, are the crystal thickness d, the incident angle ( , ) m n β , and the wavelength λ .…”

Section: Theoretical Analysismentioning

confidence: 99%

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Image Enhancement in Coherent Optical Amplification by Photorefractive Crystals

Chen¹,

Tian²,

Liu³

et al. 2014

JCC

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In this paper, a model of two-wave mixing in the photorefractive crystal, which takes account of the difference in spatial frequency in a beam, has been built to study the image enhancement effect in coherent optical amplification. Based on the theoretical analysis of the model, the gain distribution for each pixel in the signal beam has been obtained. It shows that the unevenness of the gain is induced by the difference in spatial frequency in the beam. The factors that impact on the uniformity of image enhancement have been analyzed. As an example, the effects of these factors in a given photorefractive crystal have been studied through simulation.

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Section: Theoretical Analysismentioning

confidence: 99%

“…to[14]. Substituting λ and L into Equation(3)yields the far-field small divergence angle of the laserImage Enhancement in Coherent Optical Amplification by Photorefractive Crystals plots of the non-uniformity of gain versus the average incident angle θ for different values of d have been presented in Figure 3.…”

mentioning

confidence: 99%

Image Enhancement in Coherent Optical Amplification by Photorefractive Crystals

Chen¹,

Tian²,

Liu³

et al. 2014

JCC

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“…These devices perform important tasks in several optical applications, e.g., optical switching, 8,9 optical computing, 10,11 optical signal processing, 12 and beam steering. 13 The phenomenon of two-beam coupling in photorefractive crystals has been studied by several authors theoretically and experimentally, [14][15][16][17] to obtain ring-cavity oscillation in the basic configuration of single unidirectional photorefractive ring resonator (SUPRR) [18][19][20][21][22] and coupled unidirectional photorefractive ring resonator (CUPRR). [23][24][25] One of the advantages of these resonators is that the condition of oscillations can be easily satisfied and these are capable of providing large oscillation intensity by changing the cavity detuning with very small frequency shift (a few Hz).…”

Section: Introductionmentioning

confidence: 99%

Study of oscillation performance characteristics of unidirectional photorefractive ring resonators: Cavity detuning dependence

2015

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Single unidirectional photorefractive ring resonator (SUPRR) and coupled unidirectional photorefractive ring resonator (CUPRR) were considered with BaTiO3 and LiNbO3 crystals as inter-cavity photorefractive media. The relative oscillation intensity and oscillation frequency shift of two SUPRRs with BaTiO3 and LiNbO3 crystals in their cavities, and four CUPRRs with BaTiO3-BaTiO3, LiNbO3-LiNbO3, BaTiO3-LiNbO3 and LiNbO3-BaTiO3 combinations were analysed relative to cavity detuning parameters and compared the oscillation performance of SUPRR with that of CUPRR. In SUPRR, maximum value of relative oscillation intensity is found for BaTiO3 as compared to that of LiNbO3 for zero cavity detuning. In CUPRR, the oscillation intensity in secondary cavity increases with increasing cavities detuning whereas in primary cavity it decreases with increasing cavities detuning. Major finding of this study is that the BaTiO3-LiNbO3 combination of the coupled system provides the highest relative oscillation intensity.

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Theoretical analysis of the effects of frequency detuning dependence of photorefractive two- beam coupling coefficient on gain and phase-shifts of the signal beam for a coupled unidirectional photorefractive ring resonators

Maurya¹,

Yadav²

2013

Optik

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Effect of photoconductivity and oscillation frequency shift on the signal beam intensity in two beam coupling in photorefractive materials

Cited by 7 publications

References 22 publications

Image Enhancement in Coherent Optical Amplification by Photorefractive Crystals

Image Enhancement in Coherent Optical Amplification by Photorefractive Crystals

Study of oscillation performance characteristics of unidirectional photorefractive ring resonators: Cavity detuning dependence

Theoretical analysis of the effects of frequency detuning dependence of photorefractive two- beam coupling coefficient on gain and phase-shifts of the signal beam for a coupled unidirectional photorefractive ring resonators

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