The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 30, Issue 8
Displaying 1-9 of 9 articles from this issue
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Topical Papers on Ultrafast Fiber Nonlinear Optics
Topical Papers
Laser Reviews
  • Preface for Topical Papers on Ultrafast Fiber Nonlinear Optics
    Fumihiko KANNARI
    2002 Volume 30 Issue 8 Pages 424-425
    Published: August 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.424
    JOURNAL FREE ACCESS
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  • Photonic Crystal Fibers
    Masataka NAKAZAWA
    2002 Volume 30 Issue 8 Pages 426-434
    Published: August 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.426
    JOURNAL FREE ACCESS
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    We describe the fundamentals of two new types of fiber, photonic crystal fiber (PCF) and photonic bandgap fiber (PBF). PCF is fabricated by forming small air holes in the cladding of the fiber rather than doping the fiber core with high-index materials. This fiber has very interesting new features including endlessly single-mode operation, zero GVD in the visible region, and an easily controllable spot-size due to the strongly guiding characteristics that result from the very high relative refractive index between the core and air-holed cladding. By contrast, PBF has air holes not only in its cladding but also in its core, and this enables us to confine an optical beam by using the principle of two-dimensional Bragg diffraction. The air core structure greatly reduces fiber nonlinearity and suggests the feasibility of high power transmission.
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  • “Fourier-Direct Method” for the Analysis of Monocycle Optical Pulses Propagating in Nonlinear Media
    Yo MIZUTA, Minoru NAGASAWA, Morimasa OHTANI, Ryuji MORITA, Mikio YAMAS ...
    2002 Volume 30 Issue 8 Pages 435-442
    Published: August 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.435
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    We analyzed the nonlinear propagation of monocycle optical pulses under intense dispersion and nonlinear effects in glass fibers. We applied bi-directional propagation equations, as fundamental as Maxwell's equations, without approximations to derive the nonlinear Schrödinger equation (NLS equation) including the slowly varying envelop approximation (SVEA). We were able to incorporate the delayed Raman response, the self-steepening and the core-dispersion as well as the full linear dispersion. We solved them by the split-step Fourier method (SSF), which was extended and improved for multi-dimensional integro-differential equations, instead of the finite-difference time-domain numerical method (FDTD). We call this approach the Fourier-direct method (FDM). We compared the obtained results with those by the NLS equation and calculated the compressed pulses after complete chirp compensation.
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  • Ultrashort Optical Pulse Squeezing in Nonlinear Fibers
    Masahiro TAKEOKA, Daisuke FUJISHIMA, Fumihiko KANNARI
    2002 Volume 30 Issue 8 Pages 443-449
    Published: August 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.443
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    Concepts and experimental works of ultrashort optical pulse squeezing in nonlinear fibers are reviewed. In a nonlinear fiber, optical fields are squeezed or quantum mechanically correlated by optical Kerr effect. These are, however, unobservable by direct photo-detection. Three kinds of strategies to extract the detectable squeezing have been proposed and implemented experimentally. Recent studies on applications of these squeezed pulses or the intrapulse quantum correlations to the generation of entangled states are also reviewed.
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  • Ultrafast Nonlinear Optics in Hollow Fibers
    Akira SUDA, Katsumi MIDORIKAWA
    2002 Volume 30 Issue 8 Pages 450-455
    Published: August 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.450
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    The use of hollow-core optical fibers in ultrafast nonlinear optics opens up the way to provide favorable conditions in the interaction between optical waves and gaseous media. The fundamental properties of optical waves propagating in a hollow fiber and various nonlinear phenomena generated inside the fiber are described.
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Laser Originals
  • Experimental Analysis of Ultrashort Pulse Propagation along Optical Fibers Using the Technique of Cross-Correlation Frequency Resolved Optical Gating
    Norihiko NISHIZAWA, Toshio GOTO
    2002 Volume 30 Issue 8 Pages 456-461
    Published: August 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.456
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    Characteristics of ultrashort pulse propagation in optical fibers at the wavelength region of 1.55 μm are experimentally analyzed using the cross-correlation frequency resolved optical gating (X-FROG) technique. In the anomalous dispersive fibers, widely wavelength tunable femtosecond soliton pulse is generated. The spectrogram of almost transform limited soliton pulse around 2 μm is observed. In the dispersion shifted fibers, the wavelength tunable soliton pulse and anti-stokes pulse are generated. As the results of X-FROG measurement, it is clarified that the anti-stokes pulse is overlapped with the soliton pulse and trapped by the soliton pulse. In the highly nonlinear optical fibers, 1.2-2.1 μm ultra-widely broadened super continuum and 1.46-1.68 μm linearly chirped one are generated. The spectrograms of generated super continuum are observed. The phenomenon of pulse trapping is also observed in generated super continuum.
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  • White-light Continuum Generation for Measurements of Carrier-Envelope Phase Changes of Femtosecond Laser Pulses
    Yoshihiko FUJIHIRA, Masayuki KAKEHATA, Hideyuki TAKADA, Yohei KOBAYASH ...
    2002 Volume 30 Issue 8 Pages 462-467
    Published: August 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.462
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    We demonstrated measurement of carrier-envelope phase (CEP) changes of amplified laser pulses by utilizing spectral interferometry between the white-light continuum and its second harmonic. The white-light continuum was generated by self-phase modulation (SPM) in a gas-filled hollow fiber. This method enables us to measure the CEP changes of low-repetition rate laser pulses on a shot-to-shot basis. The CEP-change of the amplified laser pulses exhibits random distribution that is mainly due to the CEP change fluctuation of the seed pulses from a carrier-envelope-offset (CEO) uncontrolled oscillator. We also demonstrated the CEO measurement of a mode-locked Ti:Sapphire oscillator. We utilized the self-referencing method, which measures the temporal beat frequency between the white-light continuum and its second harmonic. The white-light continuum was generated by the SPM in a micro-structure fiber. The temporal evolution of the beat signal showed CEO fluctuation of the uncontrolled oscillator.
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Regular Paper
Laser Original
  • Thermal Diffusivity Measurements of Metal by Using Laser-Induced Thermo Elastic Wave
    Tetsuya TANIYAMA
    2002 Volume 30 Issue 8 Pages 468-471
    Published: August 15, 2002
    Released on J-STAGE: October 21, 2009
    DOIhttps://doi.org/10.2184/lsj.30.468
    JOURNAL FREE ACCESS
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    The output of a CW type CO2 laser beam is modulated into square waves and then irradiated to a metal plate. Thermo elastic wave appeared at the irradiated part and propagated into the metal plate. A PZT is mounted on the back side of the metal plate to detect thermo elastic wave. The phase angle of thermo elastic wave changes with the modulation frequency. In this paper, the modulation frequency ƒ0 has been obtained at which the phase angle becomes 0 degree. When the thickness of the metal plate is l and the thermal diffusivity λ the relation of λ = 0.769ƒ0l 2 is obtained. If l is known, λ can be obtained by measuring ƒ0. This method is believed allow as to measure λ of not only pure metals, but also alloys.
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Technical Note
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