We demonstrate laser cooling of 40 Ca + ions in a linear-type planar trap where all electrodes are located in a plane. We numerically calculate the potential of a 500 μm scale trap and then characterize the trap by measuring the secular frequencies. Linear crystals of 40 Ca + ions are formed after coarse micromotion compensation. Development of such traps is important for the construction of a many-zone ion-trap array for large-scale quantum information processing using ions. We also present other trap designs and results from numerical analysis.

The characteristics of the surface relief hologram which is produced by a photoresist and its replica by an embossing method are experimentally studied. It becomes clear that the maximum diffraction efficiency of the photoresist hologram and that of the replica hologram are almost the same value-21-25%-and the maximum SNR of the original hologram and its replica are fairly good.

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