Energy transfer characteristics of photorefractive wave mixing in BaTiO3 at three wavelengths

Mohammad Hossien Majles Ara; M. Shaban; J. Badraghi; A. Banaei

doi:10.1117/12.611692

14 February 2005 Energy transfer characteristics of photorefractive wave mixing in BaTiO₃ at three wavelengths

Mohammad Hossien Majles Ara, M. Shaban, J. Badraghi, A. Banaei

Proceedings Volume 5776, Eighth International Symposium on Laser Metrology; (2005) https://doi.org/10.1117/12.611692
Event: Eighth International Conference on Laser Metrology, 2005, Merida, Mexico

Abstract

Photorefractive two-wave mixing and energy transfer in BaTiO₃ are studied at three wavelengths using He-Cd, He-Ne and diode laser. The Photorefractive signal beam gain is measured as a function of the pump beam intensity, beam ratio intensity, spatial frequency of the grating, and angle between the grating vector and c axis of the crystal. The exponential gain coefficient is calculated from signal beam gain, and its dependence on the same parameters is studied. The dependence of the signal beam gain and exponential gain coefficient on spatial frequency are also evaluated theoretically and found to be in good agreement with the experimental data. Also, the signal beam gain is studied as a function of wavelength, and a very high value is obtained at 441.6nm. Diffraction efficiency of photorefractive gratings recorded in two-beam coupling configuration in crystal of BaTiO₃ at multiple wavelengths is reported. We study the distortive effects in a thick PR hologram due to the angle between the two interfering beams and present our results on effect of spatial frequency on the diffraction efficiency. The behavior of crystal is compared at 441.6 nm, 632.8 nm and 780 nm using He-Cd, He-Ne and semiconductor diode lasers respectively. Value of diffraction efficiency of the crystal is higher at 441.6 nm as compared to other wavelengths. Figure-of-merit parameters such as the maximum change in the refractive index, the space charge field at saturation, the trap density of the charge carriers, and the photorefractive sensitivity of the crystals are calculated from the experimental data. Since the absorption in BaTiO₃ varies strongly with wavelength, its influence has been included in the calculation of the figure-of-merit parameters.

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Mohammad Hossien Majles Ara, M. Shaban, J. Badraghi, and A. Banaei "Energy transfer characteristics of photorefractive wave mixing in BaTiO₃ at three wavelengths", Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); https://doi.org/10.1117/12.611692

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KEYWORDS

Crystals

Diffraction

Laser crystals

Refractive index

Semiconductor lasers

Spatial frequencies

Energy transfer

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