By Katsunari Okamoto, Shoichi Sudo
Representing either technical fields and fields within which the know-how is used, members from businesses and universities in Europe, the united states, and Japan discover the potential of ubiquitous details expertise promised by means of the mixing of optical know-how, instant expertise, and web know-how. the ten papers, chosen from a could 2003 symposium in Atsugi, Japan, speak about the renaissance of physics and expertise for ubiquitous info know-how companies; new photonics, electronics, and micromechanatronics purposes for biology and ubiquitous clinical sensing; and new communications schemes for ubiquitous details expertise prone. between particular themes are photonic crystal fibers in communications and sensing, clients for a world community, physics and purposes of nanophotonics, and a near-field sensing transceiver for intrabody communications.
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1520–1525. , “Highly Birefringent Photonic Crystal Fibers,” Opt. , Vol. 25, 2000, pp. 1325–1327. , “Stimulated Raman Scattering in Hydrogen-Filled Hollow-Core Photonic Crystal Fiber,” Science, Vol. 298, 2002, pp. 399–402.  Birks, T. , “Full 2-D Photonic Band Gaps in Silica/Air Structures,” Electron. , Vol. , 1941–1942.  Mangan, B. , “Fundamental-Mode Cutoff in a Photonic Crystal Fiber with a Depressed-Index Core,” Opt. , C+Vol. 26, 2001, pp. 1469–1471. 3, European Conference on Optical Communications (ECOC’02), Copenhagen, Denmark, September 2002.
If we take a hollow-core PCF, on the other hand, it behaves more sensibly: as the bore radius increases, the effectiveness of the nonlinear interaction falls off. The factors of improvement over simple capillaries are quite startling. 3-dB/m loss provides a 104 enhancement in nonlinear figure of merit compared to capillary. Using the recent Corning result of 13 dB/km, the factor is 105. Such huge factors of improvement are very rare in nonlinear optics, and are giving rise to many revolutionary new opportunities in applications where a tight focus must be maintained over long distances.
Nanosecond pulses at wavelength 532 nm were launched into the gas-filled core and the output monitored as the pulse energy was increased. 19. 23 shows the experimental setup, together with photographs of the green pump light, the red Stokes light, and the blue anti-Stokes light emerging from the core of the 30-cm-long fiber. What is remarkable about this result is that, without too much effort, we achieved a factor of 100 times reduction in the threshold energy required to generate efficient conversion to the Stokes wavelength.