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Proceedings Paper

Application of PLZT electro-optical shutter to diaphragm of visible and mid-infrared cameras
Author(s): Yoshiyuki Fukuyama; Shunji Nishioka; Takao Chonan; Masakatsu Sugii; Hiromichi Shirahata
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Paper Abstract

Pb0.9La0.09(Zr0.65,Ti0.35)0.9775O3 9/65/35) commonly used as an electro-optical shutter exhibits large phase retardation with low applied voltage. This shutter features as follows; (1) high shutter speed, (2) wide optical transmittance, and (3) high optical density in 'OFF'-state. If the shutter is applied to a diaphragm of video-camera, it could protect its sensor from intense lights. We have tested the basic characteristics of the PLZT electro-optical shutter and resolved power of imaging. The ratio of optical transmittance at 'ON' and 'OFF'-states was 1.1 X 103. The response time of the PLZT shutter from 'ON'-state to 'OFF'-state was 10 micro second. MTF reduction when putting the PLZT shutter in from of the visible video- camera lens has been observed only with 12 percent at a spatial frequency of 38 cycles/mm which are sensor resolution of the video-camera. Moreover, we took the visible image of the Si-CCD video-camera. The He-Ne laser ghost image was observed at 'ON'-state. On the contrary, the ghost image was totally shut out at 'OFF'-state. From these teste, it has been found that the PLZT shutter is useful for the diaphragm of the visible video-camera. The measured optical transmittance of PLZT wafer with no antireflection coating was 78 percent over the range from 2 to 6 microns.

Paper Details

Date Published: 3 April 1997
PDF: 7 pages
Proc. SPIE 3028, Real-Time Imaging II, (3 April 1997); doi: 10.1117/12.270340
Show Author Affiliations
Yoshiyuki Fukuyama, Japan Defense Agency (Japan)
Shunji Nishioka, Japan Defense Agency (Japan)
Takao Chonan, Japan Defense Agency (Japan)
Masakatsu Sugii, Japan Defense Agency (Japan)
Hiromichi Shirahata, Japan Defense Agency (Japan)

Published in SPIE Proceedings Vol. 3028:
Real-Time Imaging II
Divyendu Sinha, Editor(s)

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