High optical sensitivity is observed in 0.1 wt% Ce-doped strontium barium niobate (SBN) crystals in the absence of an external electric field. Only 5–10 mJ/cm2 of incident 0.488-μm radiation is required to produce 10% diffraction efficiency, while the energy to erase holograms from the 80% to its 1/e diffraction efficiency level is 30–40 mJ/cm2 at the same wavelength. Holograms stored in Ce-doped SBN persist at least one month (decay time constant) if kept in the dark at room temperature.
A 10.4‐inch TFT‐LCD with XGA resolution has been developed using low‐temperature poly‐Si technology. We have newly developed a circuit construction and a driving method for this LCD. Positive and negative video signals are separately applied to video buslines from two D‐A conversion ICS. The integrated data‐line driver circuits operate with four multiplexing‐blocks and eight‐phase parallel video inputs. The integrated scan‐line driver circuits have shift registers operating at 10V voltage with redundancy function. High aperture ratio of 61% was realized. These result in small data‐line driver circuit width of 3.7mm, low module power consumption of 2.3W, and high reliability.
Heterojunction solar cells of Zn3P2/ITO have been fabricated by rf sputter depositing ITO films onto Zn3P2 multiple crystal, and their electrical and photovoltaic properties are studied. Multiple crystal boules of Zn3P2, 12–16 mm in diameter and 3 cm long with grain size of 1–5 mm in diameter, and resistivity ρ of 40–105 Ω-cm have been formed by vapor phase transport. The ρ of as-grown Zn3P2 has been reduced significantly by Ag doping above 400°C. A V
oc of 0.24–0.32 V and a J
sc of 13–26 mA/cm2 are measured and the power conversion efficiency of 1.1% is obtained without AR coating at simulated AM 1. The J-V characteristics suggest tunneling as the dominant conduction mechanism. A spectral response of J
sc shows a good band-pass behavior between 360 nm and 830 nm.
To promote the widespread use of light-field computational cameras, downsizing of the system is essential. This paper presents an 8.5 mm  8.5 mm  6.0 mm tiny compound-eye camera module based on the light field. The camera module is composed of a single-lens unit of a 63 field-of-view (FOV) diagonal, a microlens array (MLA) glued on an 8-Mpix color CMOS sensor (1/3.2[ format), and a read-out substrate. The captured raw MLA image is capable of constructing a 26 000-resolution depth image and refocused 2-Mpix 2D RGB images. We also demonstrated that our Bimage height calibration[ and Boptical scoring[ improved the accuracy of the measured depth and revealed it to be effective for wide-angle FOV optics, such as the lens unit used in our tiny camera module that has the potential for widespread application. Analysis of the depth accuracy proved that the measured depth accuracy with our camera was higher than 90% in the depth range from 5 to 50 cm at the image center.
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