The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
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Volume 20, Issue 4
Displaying 1-15 of 15 articles from this issue
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  • [title in Japanese]
    Takayasu MOCHIZUKI
    1992 Volume 20 Issue 4 Pages 199
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_199
    JOURNAL FREE ACCESS
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  • SHG devices for high power YAG lasers
    Shinichi IMAI, Koji KAZUTA
    1992 Volume 20 Issue 4 Pages 200-206
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_200
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    We investigated nonlinear crystals for the second harmonic generation of Nd: YAG laser radiation. KTP and LBO devices were used to generate the secondharmonic light of CW pumped Q-switched Nd: YAG laser radiation. We compared 6kinds of devices. To obtain the second-harmonic-output power as high as 10W, we found that a hydro-thermal-grown KTP device oper-ated at elevated temperature and a flux-grown LBO device operated in noncritical phase match-ing give rise to reliable operation.
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  • Growth of Large KTP Crystal and Wavelength Conversion
    Takatomo SASAKI
    1992 Volume 20 Issue 4 Pages 207-213
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_207
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    We report the fabrication and the characterization of large KTP crystals. The crystals were grown for approximately forty days by a top-seeded solution method using a K6P4O3 flux. The size was 32×42×87mm3 in a×b×c axes. A very high level of structural perfection was observed by synchrotron x-ray topography. But large changes of the refractive index were observed between growth sectors and successive changes of the index from the intial part of the growth near the seed to the final part were observed inside individual growth sectors. This may explain the different values of the phase matching angle reported in many laboratories.
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  • Organic-Crystalline Waveguiding SHG Devices
    Takashi KONDO, Ryoichi ITO
    1992 Volume 20 Issue 4 Pages 214-222
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_214
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    Properties of nonlinear optical organic crystals, including processability, linear and non-linear optical properties, are reviewed, considering their applicabilities to practical waveguid-ing SHG devices. Although highly nonlinear organic crystals will no doubt allow us to obtain ex-tremely high conversion efficiencies in configurations that are much simpler than those currently employed with inorganic crystals, there are many problems that must be solved before they be-come truly usable in practical devices. Sophisticated crystal growth technologies and microfab-rication techniques should be developed.
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  • Organic Crystals for Frequency Converters
    -2-Aadamantylamino-5-Nitropyridine (AANP) -
    Satoru TOMARU, Takashi KURIHARA, Toshikuni KAINO
    1992 Volume 20 Issue 4 Pages 223-229
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_223
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    We have a developed 2-adamantylamino-5-nitropyridine (AANP) crystal for use in frequency converters. By second-harmonic generation at 1.064 μm coefficients of d31 and d33 were deter-mined to be 80 and 60pm/v, respectively. Angle-tuned phase-matched second-harmonic genera-tion was demonstrated using a lmm AANP bulk crystal at 1.064 μm and 1.32 μm. Its conver-sion efficiency was found to be about 2×10-3W-1 and 10-3W-1, respectively. By using the AANP crystal, optical parametric interaction around 1.3 μm wavelength was also observed.
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  • A Diode-Pumped High Power Nd: YAG Laser and its Frequency Conversion
    Michio OKA, Yushi KANEDA, Hisashi MASUDA, Shigeo KUBOTA
    1992 Volume 20 Issue 4 Pages 230-235
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_230
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    Scaling of a laser-diode pumped Nd: YAG laser is demonstrated by means of fiber-bundle end-pumping. Using nineteen fibers with thirty-eight 1-W laser diodes, we obtained a 6.7W TEMoo mode output at 1.06 μm. Intracavity frequency doubling from an LD-pumped Nd: YAG laser us-ing KTiOPO4 facilitates the efficient generation of continuous wave 532nm green output as high as 1W. By using the green output, another doubling to 266nm was acheived by means of an ex-ternal resonant β-BaB2O4 doubler.
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  • Periodic Domain Reversal Structures Written by Electron Irradiation and Their Quasi Phase Matching
    Hiromasa ITO
    1992 Volume 20 Issue 4 Pages 236-243
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_236
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    A novel technique is reviewed for the fabrication of domain reversed gratings in ferroelectric materials such as LiNbO3 and LiTaO3 by means of direct electron beam writing at room tempera-ture without any DC bias. The domain grating is fabricated not only on the beam irradiated-c surface of the crystal, but also in the entire region of the crystal. Such a structure should be useful for various nonlinear optic applications. Theoretical as well as experimental studies have been performed on the second harmonic generation under the quasiphase matched condition. High conversion efficiency has been demonstrated for both LiNbO3 and LiTaO3 crystals.
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  • Blue Laser Devices Using Frequency-Doubled Laser Diodes
    Hiromi SAKURAI, Tadanori SENOH, Yoshinobu TAKANO, Tomonobu SENOH, Yuzu ...
    1992 Volume 20 Issue 4 Pages 244-250
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_244
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    Modulatable, stable, and highly efficient small-size blue laser sources are recently considered very promising for high-density optical data storage, laser printer, and so on. A frequency-dou-bled AlGaAs laser diode using a monolithic KNbO3 resonator is expected to be more practical be-cause of its high SH power. We developed compact blue laser devices by this method. These devices, with size of 50×30×20mm3, have an SH output above 10mW with relative intensity noise of - 136dB/Hz and slightly elliptical Gaussian beam profile. We also found a new techni-que for direct modulation of blue radiation by using the EO-effect of KNbO3 crystal.
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  • Frequency Conversion of CW Coherent Light with External Cavities
    Kazuhiro HAYASAKA, Masayoshi WATANABE, Hidetsuka IMAJO, Shinji URABE
    1992 Volume 20 Issue 4 Pages 251-258
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_251
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    This paper describes the frequency conversion of CW coherent light with external enhance-ment cavities. The generation of 397nm UV radiation by frequency doubling of a 0.78μm diode laser and generation of 194nm VUV radiation by sum-frequency mixing are described. In the frequency doubling experiment, a UV radiation of several μW was generated, while in the sum-frequency mixing, a 16μW VUV output was obtained.
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  • Third Harmonic Conversion in High Power Glass Laser for Fusion
    Takahisa JITSUNO
    1992 Volume 20 Issue 4 Pages 259-266
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_259
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    This paper deals with the third harmonic conversion technology on the high power glass laser for fusion application, The details of the fabrication and alignment procedures of a 36cm dia-meter segmented KDP crystal cell with an index matching fluid, and the energy monitor system for third harmonic light without distortion on the beam patterns are described. The conver-sion efficiency from 1.05μm to 0.35μm was found to be 60±10% for 12 beams.
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  • Sum Frequency Generation with KTP
    Kimio TATSUNO
    1992 Volume 20 Issue 4 Pages 267-273
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_267
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    A KTiOPO4 nonlinear crystal gives 459-nm blue laser by sum frequency generation using an 809-nm diode laser and a 1064-nm Nd doped solid-state laser end pumped by diode laser, The laser is expected to be a compact blue laser sources to increase the storage density of optical disks and to improve the image quality of laser beam printers.
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  • Tuning Properties of SFG in KTP
    Toshiki KISHIMOTO, Kuniyasu IMAMURA, Masahiro ITOH
    1992 Volume 20 Issue 4 Pages 274-278
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_274
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    Sum frequency generation (SFG) is one of the attractive methods for blue lasing with easy performance. Focusing on SFG, particularly, pumped by a single laser diode and using KTP (KTiOPO4) grown in a tungustate flux, we studied the phase matching conditions and the achievable shortest wavelength. The phase matching angles of the SFG using a Nd : YAG laser (pumped by LD) and LD (0.809μm) were θ= 90°, φ=84°or θ=74°, φ=90°, which were slightly different from the reported ones (θ=90°, φ=90°) . We could phase-match the system to a shorter wavelength, 0.452μm, than those reported.
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  • Visible Light Generation by Upconversion
    Aki SHIKIDA, Hiroaki YANAGITA, Hisayoshi TORATANI
    1992 Volume 20 Issue 4 Pages 279-287
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_279
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    Upconversion is a frequency upconverting process utilizing the excited state absorption (ESA) or energy transfer (ET) of rare earth ions. In this article, the history of research on up-conversion materials and the recent development of upconversion lasers are reviewed.
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  • SHG and OPO Characteristics of MgO-Doped LiNbO3 Crystals
    Yasushi OHBAYASHI
    1992 Volume 20 Issue 4 Pages 288-293
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_288
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    SHG and OPO characteristics of magnesium oxide-doped lithium niobate (MgO: LiNbO3) crys-tals were studied. The non-critical phase matching was established for the SHG of a Nd: YAG laser at room temperature by controlling MgO concentration. An SHG output power of 52mJ was obtained at a pump power of 102mJ, giving a conversion efficiency exceeding 50%. OPO using MgO: LiNbO3 crystals was also investigated. The oscillation in the near-infrared region from 720 to 2000nm, pumped at 532nm, was generated successfully. The maximum power of 1OmJ was obtained at 874nm when an input energy was 50mJ; this gives a conversion efficiency of about20%.
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  • [title in Japanese]
    1992 Volume 20 Issue 4 Pages i
    Published: April 29, 1992
    Released on J-STAGE: March 17, 2010
    DOIhttps://doi.org/10.2184/lsj.20.4_i
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