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Volume 25, Issue 10
Displaying 1-11 of 11 articles from this issue
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Yoshiji SUZUKI1997 Volume 25 Issue 10 Pages 673
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
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Ichirou YAMAGUCHI1997 Volume 25 Issue 10 Pages 674-675
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
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Teruhiro SHIONO1997 Volume 25 Issue 10 Pages 676-681
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn the field of microoptics, surface-relief diffractive optical elements (DOEs) are of great interest. Their thin film structure makes it possible to produce and integrate them with other optical components. Recent development in microfabrication technology including electron-beam lithography and binary optics lithography has demonstrated DOEs with blazed/multilevel relief structure. Such relief structure can improve diffraction efficiency of DOEs. Electron-beam lithography has several advantages such as a potential for submicron patterning and flexibility in design and fabrication. In addition, blazed structure can be formed by one process. Binary optics lithography is also attractive because high efficiency DOEs with multilevel structure can be fabricated by semiconductor techniques used in electronic integrated circuits. Typical DOEs with blazed/multilevel structure and their application to micro infrared sensor are demonstrated. Such surface-relief DOEs are expected to be used in various optical systems.View full abstractDownload PDF (1177K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1997 Volume 25 Issue 10 Pages 681-681,686
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
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Haruhiko ITO, Motoichi OHTSU1997 Volume 25 Issue 10 Pages 682-686
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSOptical near field realizes the precise control of atomic motion. As the first step, guiding of atoms through micron-sized hollow optical fiber is demonstrated. The two-step laser-photoionization spectroscopy shows the frequency dispersion properties of dipole interaction between atoms and optical near field. The species- and state-selective guidance is applied to in-line spatial separation of two stable Rb isotopes. In addition, the cavity QED (Quantum Electrodynamics) effect inside a dielectric cylinder is observed for the first time. The atom fiber has the faculty of carrying atoms to an arbitrary point over a long distance and then is useful as a novel scheme of optically controlled atomic deposition. The feasibility of creating dot-shaped nano-scale structures is illustrated through measurement of spatial distribution of the guided atom flux. Finally, a method of manipulating atoms beyond the diffraction limit of light waves is presented including sharpened optical fibers and an atomic funnel with optical near field.View full abstractDownload PDF (1032K) -
Toshiaki NOSE, Susumu SATO1997 Volume 25 Issue 10 Pages 687-691
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSMolecular orientation effects by a nonuniform electric field are investigated for utilizing a spatial distribution properties of the refractive index in a liquid crystal cell. A circular hole patterned electrode structure is adopted to produce an axially symmetric electric field and a graded index type lens; that is, the Liquid Crystal Microlens has been attained. Since the index distribution properties can be controlled by the voltage, it can have a variable focusing properties for the extraordinary ray. By the optimization of the electrode structure, excellent focusing properties of which focal point is as small as diffraction limit can be attained. If the electrode on a surface of the substrate is separated by a slit and driven by a different voltage, we can expect an additional beam steering function with conventional variable focusing properties. Furthermore, we can expect a new type of liquid crystal microlens by introducing a new liquid crystal material and/or technology such as a UV curable liquid crystal, polymer stabilization technique and etc.View full abstractDownload PDF (1200K) -
Hiromichi HORINAKA, Kenji WADA, Yoshio CHO1997 Volume 25 Issue 10 Pages 692-696
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA method using polarization modulation was employed to extract photons traveling along a nearly straight line in a scattering medium. Removal of a floor level normally appearing on the dynamic range over which the extraction capability is mainted is demonstrated. The method was applied to take the projection data of absorbers in a highly scattering medium and the optical computed tomography (CT) image was reconstructed from the projection data. It exhibited higher spatial resolution than the image reconstructed from the projection data by conventional method. The optical CT apparatus was fabricated and applied to a pimiento and a summer orange. Although the spatial resolution of images was not sufficient, the internal section and core could be recognized.View full abstractDownload PDF (1266K) -
Hiroshi YAMAMOTO, Yukihiro OZAKI1997 Volume 25 Issue 10 Pages 697-701
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSOwing to recent rapid progress in laser light sources and detectors, applications of Raman spectroscopy have been expanding to various fields such as industries, foods, environmental measurements and medicine. In this review, we discuss the potential of Raman spectroscopy in highly sensitive gas analysis. Examples of the analysis of metabolic gases by Raman spectroscopy will be described in connection with the possibility of respiratory gas analysis by Raman spectroscopy. In addition, compact Raman system for gas analysis designed by our group will be presented.View full abstractDownload PDF (853K) -
Anping LIU, Kouichi KAMETANI, Kenichi UEDA1997 Volume 25 Issue 10 Pages 702-706
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSAn Nd-doped rectangular double-clad fiber (DCF) laser pumped with a 10W fiber coupled LD is demonstrated. Furthermore, the two ends of the fiber are bundled together to achieve efficient matching with the LD. With such a configuration, about 5.4 W of the pump light is launched into the first-cladding and 2.8W laser output is obtained. A slope efficiency of 58% with respect to launched pump power has been achieved. The brightness compressibility of source to laser emission reaches to 700. It is found that the open-cavity is an optimal resonator for clad-pumped fiber lasers.View full abstractDownload PDF (1142K) -
Hideo YAMAKOSHI, Chie KUWADA, Ichiro YAMASHITA, Mitsuo KATO, Hiroshi M ...1997 Volume 25 Issue 10 Pages 707-711
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA two-dimensional simulation code of a discharge-pumped excimer laser was developed to study the effect of spatial discharge non-uniformity on laser output performance. The code consists of a circuit equation, a continuity equation to calculate two-dimensional electric field, a steady-state Boltzmann equation, and rate equations. The preionization distribution was found to affect the electron and the excited particle distributions and hence the laser beam profile. Even with uniform-field electrodes, the calculated electric field distribution was not uniform, being effected by the configuration of surrounding structures, and varying in time with the changing discharge plasma conditions. The electric field surrounding insulating structures were found to increase prior to gas breakdown and to decrease afterwards.View full abstractDownload PDF (1005K) -
Light from Atoms Shined by LightYoshio CHO1997 Volume 25 Issue 10 Pages 712-718
Published: October 15, 1997
Released on J-STAGE: February 26, 2010
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