Compensation of emulated atmospheric disturbance and tracking of a moving object by a real-time digital phase conjugate mirror using a liquid crystal spatial light modulator

被引:0
|
作者
Kawakami, Kotomi [1 ]
Nakagawa, Tomoya [2 ]
Tanaka, Hiroto [2 ]
Okamura, Hideki [2 ]
机构
[1] Kitasato Univ, Coll Liberal Arts & Sci, Ctr Nat Sci, Phys Sect, Kanagawa 2520373, Japan
[2] Int Christian Univ, Grad Sch Nat Sci, Dept Phys, Tokyo 1818585, Japan
来源
ENGINEERING RESEARCH EXPRESS | 2023年 / 5卷 / 02期
关键词
digital optical phase conjugation; wireless optical transfer; atmospheric disturbance correction; wavefront compensation; DISTORTIONS;
D O I
10.1088/2631-8695/acd51f
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We developed a fast-response digital phase conjugate mirror using a 700 Hz high-speed liquid crystal spatial light modulator and a high-speed camera. The total delay from signal light acquisition to phase conjugate light generation was 9.7 ms at 1246 x 1024 and 5.9 ms at 640 x 512. The tracking experiment performed on a target moving at a constant distance perpendicular to the optical axis, produced an error of 2%. Furthermore, a heated soldering iron, used to compensate for artificially generated air disturbance, showed that beam wandering and intensity fluctuations were reduced by 86% and 55%, respectively, compared to a phase conjugate mirror with added delay. Phase conjugate light irradiation of a continuously moving target at a maximum speed of 0.9 mm s(-1) was also performed. This study shows that real-time digital phase conjugate mirrors can correct wavefront distortion caused by air fluctuation, which is a major challenge in long-distance wireless optical transmission in the turbulent atmosphere, without complicated control, and prevent beam quality degradation in the presence of atmospheric disturbance.
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页数:6
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