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 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 , with an activation energy of 0.16 eV.
© 1996 Optical Society of America
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