A 3D-shift multiplexing is reported with converging signal and diverging random phase coded reference beam into the
Cu:Ce:Tb:CLN crystal. Shift-selectivity at first null along x,y and z-axis is measured to be 1.5, 5 and 5mm for random
phase-coded reference beam. Low capacity data page with only 1-4 kbits were successfully recorded/retrieved and the
achievable raw areal density of >350 Gbit/in2 will be reported.
A laminated holographic recording medium based on photorefractive lithium niobate crystal is reported for the first time.
The medium consists of a piece of photorefractive crystal, a data tracking layer, an intermediate dichroic mirror layer and
an anti-reflection layer. Such a holographic medium is able to perform hologram recording and retrieving with
compatibility with collinear and coaxial holographic recording schemes.
In2O3 and Fe2O3 were doped in LiNbO3 and Czochralski method was used to grow In:Fe:LiNbO3 crystals. The light scattering ability resistance, exponential gain coefficient, diffraction efficiency and response time of the crystals were measured. The light scattering ability resistance and response time of In:Fe:LiNbO3 is one magnitude higher than Fe:LiNbO3. In:Fe:LiNbO3 was used as storage element to make the large capacity holographic storage and the holographic associative storage reality. The excellent results were gained.
Zn, Fe:LiNbO3 crystal, with fine photorefractive properties, has been grown by Czochralski technique. Its response time was measured to be about ten seconds, the diffraction efficiency to be higher than 70 percent. Employing Zn, Fe:LiNbO3 as a holographic record media, another photorefractive crystal Cu:KNSBN as a self-pump phase conjugate mirror, the double-exposure interferometry has been studied in this paper.
Doping a little Fe2O3 and Tb4O7 into LiNbO3, the double-doped crystal LiNbO3:Fe,Tb was grown by Czochralski method. Its diffractive efficiency and the four-wave mixing phase conjugate reflectivity were measured to be the similar to the single-doped LiNbO3: Fe crystal. But the response time of the double-doped crystal was measured to be tens seconds, showing a great improvement comparing with LiNbO3: Fe. The mechanism of the results was discussed by measuring and calculating the values of the photoconductivity.
The two-beam couple exponential gain coefficient depends extremely on the thickness of the crystal, the diameter of the pump light, and the temperature. The largest value may reach 237 cm-1. The experimental results is reported and discussed in this paper.
Reduced in powdered2Li3CO2, the photorefractive effect of Tb:Fe:LiNbO3 crystal was enhanced greatly. The absorption spectra, the photoconductivities and the lattice parameters were measured to discuss the experimental results and the reduction mechanism.
The doped bismuth germanate (BGO) crystals have excellent phase conjugate effect. This effect can be observed in pure BGO crystal under an applied electric field. But in doped BGO, electric field doesn't necessary. The crystals were grown by czochralski method.
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