The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 27, Issue 12
Displaying 1-12 of 12 articles from this issue
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  • [title in Japanese]
    Yoshihiro OHTSUKA
    1999 Volume 27 Issue 12 Pages 803
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.803
    JOURNAL FREE ACCESS
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  • Multiphoton Microscopy: New Markets and Technology Brought by Femtosecond Lasers
    Satoshi KAWATA
    1999 Volume 27 Issue 12 Pages 804
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.804
    JOURNAL FREE ACCESS
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  • Advanced Laser Sources for Multiphoton Microscope
    Kenichi UEDA
    1999 Volume 27 Issue 12 Pages 805-811
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.805
    JOURNAL FREE ACCESS
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    The advanced laser techniques for multiphoton microscope are introduced in terms of femtosecond pulse generation. The compact ultrafast fiber lasers are described as the second generation of femtosecond lasers for microscopy. For the third generation techniques, the advanced techniques such as light propagation control by index profiles in core and clad area are promising. The photonic fiber structure generates the super continuum in 1-m long fiber. Several ideas for multi-color and tunable pulse generation are discussed. The engineering developed for scientific and industrial applications should be combined for the compact and reliable light source for multiphoton microscopy.
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  • Multiphoton-Excitation Scanning Laser Microscopy
    Osamu NAKAMURA
    1999 Volume 27 Issue 12 Pages 812-816
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.812
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    The principle and the characteristics of multiphoton exciting microscopy have been described . The spatial resolution and the practical setup of the microscopy have been shown. Recent progress on viewing dynamics in cells such as the propagation of Ca2+ wave is also shown with experimental results. The future of multiphoton microscopy and its applications are investigated.
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  • Multiphoton Microscope and Optical Data Storage
    Hiroaki MISAWA
    1999 Volume 27 Issue 12 Pages 817-822
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.817
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    To achieve high bit densities (<10GB/cm3) in optical memory, we accomplished a three-dimensional optical data storage system using vitreous silica as the recording material. We succeeded in high-density optical recording by focusing pulsed laser beams of 532 nm (full width at half maximum 30ps) and 400 nm (150 fs). A recording of 72.9 GB/cm3 was achieved, which corresponded to that of 100 compact disks, on aglass plate of (2×2) cm2 and 2.2mm thickness. We also demonstrate separate readouts of three-dimensional memory by (i) transmission imaging using a conventional optical microscope and (ii) photoluminescence (PL) of the bits created by inducing optical damage within the vitreous silica. This shows the potential for two-bit information recording per single bit by means of separate readout procedures.
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  • Multiphoton Microscopy and Microspherical Laser
    Hideki FUJIWARA, Keiji SASAKI
    1999 Volume 27 Issue 12 Pages 823-826
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.823
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    We introduce upconversion lasing of a rare-earth ion-doped fluorozirconate glass microsphere in which tens-of-micrometer-sized, genuinely spherical glass particles are produced by a melting method and pumped by a focused near-infrared laser beam. Three-photon-excited emission can be observed in the blue and red wavelength regions at room temperature, and their pumping-power dependences indicate the lasing operation. We also discuss the application of the microspherical upconversion laser as a probe of a near-field scanning optical microscope. A nanometer-sized particle is attached to the lasing microsphere, which can scatter the highintensity evanescent field generated just outside of the sphere, resulting in the formation of a minute light source for use in near-field microscopy. The lasing microspherical probe has an advantage of high sensitivity due to intracavity enhancement of the tunneling loss.
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  • Bistatic Imaging Lidar Measurements in the Lower Atmosphere
    Jinming LIN, Hidetsugu MISHIMA, Yasuhiro KUBOTA, Fumitoshi KOBAYASHI, ...
    1999 Volume 27 Issue 12 Pages 827-834
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.827
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    In order to measure spatial distributions of aerosol, fog and clouds in the lower atmosphere during daytime as well as nighttime, we have been developing a bistatic imaging lidar using a high sensitivity cooled CCD camera with an image intensifier as a high speed shutter. We made two field observational campaigns. One made cooperatively with a wind profiler and a radiosonde at Moriya (36 km north of Tokyo) for 5 days from May 26 to 30, 1997 and another cooperatively with a monostatic lidar at Hakuba alpine ski area of Nagano for 10 days from February 7 to 16, 1998 during the period of the 18th winter Olympic Games in Japan. In this paper we report the results obtained at both campaigns and demonstrate the unique capabilitiesof the bistatic imaging lidar in measuring meteorological features of the lower atmosphere under different local conditions.
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  • Photoacoustic Spectroscopy Using a Waveguide CO2 Laser and Its Application to Trace Gas Detection
    Shinsuke YAMAKAWA, Noburu SOKABE
    1999 Volume 27 Issue 12 Pages 835-839
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.835
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    We have constructed a photoacoustic system for spectroscopy using a waveguide CO2 laser with afree spectral range of 230 MHz. From analysis of photoacoustic spectral line shape of nine infrared absorption lines of CH3OH and C2H4, pressure broadening, pressure shift parameters and offset form the pertinent CO2 line center have been obtained in the pressure range from 20 Pa to 1000 Pa. The selected lines are related with far infrared lasing and trace gas detetion of plant hormone. The system has detection sensitivity of 35 ppb for C2H4 in N2 under the atmospheric pressure.
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  • Heat Effect of Free Electron Lasers on Cholesteryl Oleate
    Yuko Fukami, Kunio Awazu
    1999 Volume 27 Issue 12 Pages 840-844
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.840
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    We demonstrated selective removal of cholesteryl oleate which is specifically accumulated in the arteriosclerotic region on the arterial walls. To discuss what mechanisms are there in effects which were induced by infrared free electron lasers (FEL), we compared FEL exposure effects and heating effects. FEL exposure experiments were carried out using wavelength of 5.75μm and several average power (2-15 mW). The FEL exposure induced melting and decrease of ester bonds. Using the values of absorbed 1FEL-macropulse energy for each power densities, temperature was estimated to be 50-300°CIn the heating experiments, the sample was heated from room temperature to 500°CMelting and carbonization were observed at 50°C and 300°C respectively. We found that melting is induced by both of the FEL exposure and the heating, structural changes and ablation are induced only by the FEL exposure, and that carbonization are not induced by the FEL exposure but by the heating.
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  • Visualization of Shielding Gas Flow and Laser Beam Refraction Zone during CO2 Laser Welding
    Kunimitsu TAKAHASHI, Shunichi SATO
    1999 Volume 27 Issue 12 Pages 845-849
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.845
    JOURNAL FREE ACCESS
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    The behavior of the shielding gas and the beam refraction zone in the welding plasma formed during CO2 laser welding of metals were observed using the schlieren and shadowgraph imaging techniques, respectively. A visible light source was used for the schlieren observations. A stationary Gaussian-distribution-shaped gasdensity boundary was clearly seen to form on the welding pool under the Ar shielding gas. A fluid disturbance, namely, the application of a cross gas flow, extinguished the foot of the density boundary, resulting in a heavily oxidized weld bead. An infrared light source was used for the shadowgraph observation. The images showed that elliptical zones for the laser-beam refraction were produced. The schlieren and shadowgraph imaging techniques are thus effective for observing phenomena caused by the interaction between the laser beam and the shielding gas/laser-induced plasma formed on the welding pool.
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  • Study on Imaging Method through Random Scattering Media by Transmitting Diffraction Light Detection
    Tsutomu ICHIMURA, Kouji HOSAKA, Hidekazu NAKAMOTO, Naohiro TANNO
    1999 Volume 27 Issue 12 Pages 850-855
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.850
    JOURNAL FREE ACCESS
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    We studied methods of imaging through random scattering media by transmitting diffraction light detection and demonstrated that both the directly transmitted light and the diffracted light are able toreconstruct the images in random scattering. Images are more efficiently formed from the transmitted diffracted light in random scattering using a lens than from the direct transmitted light.
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  • Fundamentals of Laser Spectroscopy I: Raman Scattering Spectroscopy
    Shinichi NAKASHIMA
    1999 Volume 27 Issue 12 Pages 856-861
    Published: December 15, 1999
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.27.856
    JOURNAL FREE ACCESS
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