Abstract

Elementary holographic gratings are recorded in Ca₃Mn₂Ge₃O₁₂ at 633 nm with orthogonal, linearly polarized writing beams at temperatures below 180 K. Refractive-index amplitudes of as high as $1.5\times {10}^{-4}$ are achieved at temperatures below 100 K. We analyze the dependence of the diffraction efficiency on the polarization of the recording beams. The time constant for writing at 100 K with a total intensity of 540 mW/cm² is 15.5 s. The temperature dependence of the holographically determined light-induced refractive-index changes can be described by $\Delta n(T)=\Delta n(T=0)\{1/[1+r exp(-E_A/\mathit{kT})]\}$, with an activation energy of 0.16 eV.

© 1996 Optical Society of America

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