Presentation 4

ナノテクの記述。

Nano-technology Optical Protection Filters And Limiters
Ram Oron, Ariela Donval, Yaniv Leitner, Boaz Nemet, Moshe Oron, Regina Shvartzer
KiloLambda Technology, Ltd.

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Optical systems are susceptible to saturation or permanent damage caused by over-power. This problem calls for a passive device that will switch off or limit the propagating light power when it exceeds a certain threshold.

We present nano-technology, passive, solid-state threshold-tiggered optical filters and limiters. At input power below threshold, their transmission is high (〜80％) over the whole spectral band. However, when the input power exceeds the threshold power, transmission is either decreased dramatically or limited.

As opposed to fixed spectral filters, which permanently block only specific wavelengths, the wideband filters and limiters are clear at all wavelengths until they are hit by high power light. The filters become permanently opaque at the spot that is hit by high incident optical power, whereas the limiters simply (and reversibly) limit the optical power to a predetermined level. The limiting and filtering technologies are based on nano-particle layers that are responsible for the nonlinear optical response. At high power, most of the light it scattered leading to a significant reduction in the propagating power. These technologies are successfully applied in optical fibers and free-space optics.

We demonstrate fiber based optical filters and limiters as well as free-space filters for protection from high power lasers. These operate in the visible and the near infra-red range, and can be readily used for power regulation and protection of telecom detectors, cameras, or eye safety.

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http://www.kilolambda.com/
Journal of Lightwave Technology http://jlt.osa.org/abstract.cfm?id=66494
http://www.yozma.com/news/detailed.asp?item_id=18