Nobukawa Teruyoshi, Nomura Takanori
Appl Opt. 2014 Jun 10;53(17):3773-81. doi: 10.1364/AO.53.003773.
A high-resolution and multilevel designed reference pattern (DRP) is presented for improvement of both light utilization efficiency and the signal-to-noise ratio (SNR) of reconstructed images in coaxial holographic data storage. With a DRP, the desired Fourier power spectrum of a reference beam is obtained. Numerical and experimental results show that the DRP increases the SNR compared with that of a random phase mask (RPM). Moreover, the light utilization efficiency of the DRP is higher than that of a high-resolution RPM. In addition, the effect of the phase level and the pixel pitch of DRPs on the SNR and the light utilization efficiency are investigated.
提出了一种高分辨率、多层次设计的参考图案（DRP），以提高同轴全息数据存储中光的利用效率和重建图像的信噪比（SNR）。利用DRP，可以获得参考光束所需的傅里叶功率谱。数值和实验结果表明，与随机相位掩模（RPM）相比，DRP提高了信噪比。此外，DRP的光利用效率高于高分辨率RPM。此外，还研究了DRP的相位水平和像素间距对信噪比和光利用效率的影响。
