The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 28, Issue 9
Displaying 1-12 of 12 articles from this issue
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  • Miscellaneous Thoughts on the Femtosecond-World
    Takashi KAWABATA
    2000 Volume 28 Issue 9 Pages 575
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.575
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  • Laser Technologies for Higher-Density Optical Disks
    Kazuhisa YAMAMOTO
    2000 Volume 28 Issue 9 Pages 576-580
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.576
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    Great progress has been made in optical disk systems with the development of new laser technologies. Recently, blue-violet lasers have attracted attention because of their potential applicability to the next generation of high-density optical disks. This paper describes the recent development in blue-violet lasers. In addition, technologies for advancing high-density optical disks are introduced.
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  • [title in Japanese]
    2000 Volume 28 Issue 9 Pages 580-580,589
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.580
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  • High Power InGaN Violet Laser Diode
    Toshio MATSUSHITA
    2000 Volume 28 Issue 9 Pages 581-584
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.581
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    A violet InGaN multi-quantum-well (MQW) separate confinement-heterostructure laser diode was grown on epitaxially laterally overgrown GaN (ELOG) on sapphire. The LDs showed an output power as highas 30 mW under room-temperature continuous-wave (CW) operation. The estimated lifetimes of the LDs were more than 1000 hours, during constant 30 mW output power at a case temperature of 60°C
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  • Phase-change Optical Disk Technologies for Utilizing Blue-Violet Laser
    Noboru YAMADA
    2000 Volume 28 Issue 9 Pages 585-589
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.585
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    The use of blue-violet laser sources such as SHGs devices and GaN laser diodes is one of the most promising strategies for continuing to increase the recording capacity of phase-change optical disks. Shorter wavelength lasers can be combined with other approaches, including the use of an objective lens with large NA of close to or exceeding 1.0 and a dual-layer disk structure. Phase-change materials for use under these conditions are required to show large changes in the optical constants of n or k combined with sufficiently large optical transmittance at the shorter wavelength, as well as a sufficiently high crystallization rate to compensate for the smaller laser spot size. It is thought that Ge-Sb-Te will be applicable to the memory layer ofphase-change optical disks using blue-violet laser light in the same way as red laser light is now used.
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  • High Data Transfer Rate and High Density Optical Disk Head
    Kenya GOTO, Satoshi MITSUGI, Kazuma KURIHARA, Kazuhiro SUZUKI, Young J ...
    2000 Volume 28 Issue 9 Pages 590-599
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.590
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    Writing and reading probes with much higher optical efficiency than conventional fiber probes for high density optical disk system are described. In order to get smaller beam waist size than that due to the diffraction limit using conventional beam collecting devices, semiconductor materials of high refractive index are adopted as a prism type probe, of which top is flat cut. The diameter of the cutting area is a little larger than a half wavelength in the material. In the case of the GaP prism probe, the half wavelength is about 100 nm. After developing various fabrication processes, a prism like probe array with a flat cut tip has been prepared successfully, of which output window diameter is about 150 nm. Evaluation results of probe arrays using Scanning Near-field Optical Microscopy (SNOM) show that the laser beam emitted from flat-tip-probes hasthe diameter of about 150 nm and the throughput is also good enough to apply them to the high density optical disk system.
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  • Optical Waveguide SHG Devices Using LiNbO3 Epitaxial Grown and Ultraprecision Machining Technique
    Tatsuo KAWAGUCHI, Kiminori MIZUUCHI, Kazuhisa YAMAMOTO, Takashi YOSHIN ...
    2000 Volume 28 Issue 9 Pages 600-603
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.600
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    Quasi-phase-matched second-harmonic generation (QPM-SHG) devices using LiNbO3 optical waveguides show great potential as low noise and high beam quality blue-violet light sources applicable for high-density optical disks. Optical waveguides with a step index profile are desired for achieving strong confinement and sufficient overlap between the propagation modes in order to realize a high conversion efficiency. Liquid phase epitaxy of LiNbO3 is a novel technique which yields a step index thin-film waveguide structure by doping ZnO in the film. Ultraprecision machining is a powerful technique for processing three-dimensional optical waveguides. The maximum SHG power of 50 mW at 425 nm wavelength was obtained using a ridgetype waveguide device which was fabricated from a periodically domain-inverted MgO: LiNbO3 crystal by ultraprecision machining.
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  • Fabrication of a Highly Efficient Quasi-phase-match Device for Blue-Violet Second-Harmonic Generation
    Tomoya SUGITA, Kiminori MIZUUCHI, Yasuo KITAOKA, Kazuhisa YAMAMOTO
    2000 Volume 28 Issue 9 Pages 604-608
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.604
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    We present a method for controlling the shape of the domain-inverted structure in an off-cut MgO: LiNbO3 crystal utilizing two-dimensional high-voltage application. Using this technique, a periodically domain-inverted structure with a period of 3.2 Jim and thickness of 2.0 μm was fabricated over a 10-mminteraction length. This structure has made possible sufficient overlaps between propagation modes and domain inversion in the waveguide. Using this structure, we demonstrated a cw blue-violet second-harmonic generation of 17.3 mW at the wavelength of 426 nm with a single pass of 55 mW of cw AlGaAs laser diode input, which corresponded to a 31 % power conversion efficiency.
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  • Development of a Hybrid Helical Microwiggler with Four Poles per Period
    Yoshiaki TSUNAWAKI, Yoshihiko OKUDA, Nobuhisa OHIGASHI, Mitsuhiro KUSA ...
    2000 Volume 28 Issue 9 Pages 609-612
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.609
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    A test hybrid helical microwiggler with 4 poles per period has been designed and developed with parameters such as period of 10 mm, gap diameter of 5 mm and periodical number of 10. One period of its wiggler is constructed with four segments. Each of them has a thickness of 2.5 mm and consists of pentagonal permanent magnets and permendurs as ferromagnets. Each segment is stacked along wiggler axis rotating byangle of 90°C It is so small that the outer width is 72 mm. The measured peak field is 0.35 to 0.4 T depending on the gap space of 5.2 to 4.8 mm.
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  • Indocyanine Green as a Mid-infrared Marker for Photodynamic Therapy
    Yuko FUKAMI, Kunio AWAZU
    2000 Volume 28 Issue 9 Pages 613-616
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.613
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    Indocyanine green (ICG) is used in non-invasive liver function testing. It is known that ICG binds plasma protein especially. These methods use ICG as a visible light marker for special protein. However, ICG has sharp and large absorption peaks not only in visible legion but also in IR region. ICG has an IR absorption peak of -13000 cm-1 at 7.1 μm. In this study, ICG was exposed to free-electron lasers (FELs) with wavelength of 7.1 μm and usefulness of ICG as an IR-marker was discussed. The results from FT-IR and sample thickness measurements showed that ICG ablated with the power density of more than 5 W/cm2 (=Pt), and that the molecular structure of ICG was stable at 7.1 μm -FELs of less than Pt, 3.0 W/cm2. Therefore ICG can be considered as a novel infrared marker (IR-marker) to the living tissue.
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  • Er-Thermally-Diffused Ti: LiNbO3 Waveguide Laser
    Masatoshi FUJIMURA, Koji MATSUDA, Takatomi KODAMA, Hiroshi NISHIHARA
    2000 Volume 28 Issue 9 Pages 617-618
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.617
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    An Er-thermally-diffused Ti: LiNbO3 waveguide laser was demonstrated. Er diffusion into LiNbO3 was a key process to implement the waveguide laser, and we found that thermal diffusion of an Er film of13-nm thickness at 1090°C for 100 h in dry oxygen atmosphere provides Er-diffused crystal with a smoothsurface and appropriate Er concentration. A waveguide laser was fabricated using the crystal. The waveguide laser cavity consisted of a Ti-diffused channel waveguide with 10-μm width, a dielectric mirror attached on one waveguide facet and an Au mirror deposited on the other facet. The laser was optically-pumped at 1.48-μm wavelength, and CW laser oscillation was obtained at 1.53 μm with a threshold of 10 mW. A maximum laser output up to 100 μW was obtained so far.
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  • Electrooptic and Nonlinear Optical Materials and Devices II
    Kazuo KURODA
    2000 Volume 28 Issue 9 Pages 619-626
    Published: September 15, 2000
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.28.619
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