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Volume 15, Issue 7
Displaying 1-14 of 14 articles from this issue
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Takuzo SATO1987 Volume 15 Issue 7 Pages 479-480
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
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Kunioki MIMA, Hideaki TAKABE, Toshiki TAJIMA1987 Volume 15 Issue 7 Pages 481-494
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSRecently, very high longitudinal acceleration field has been observed experimentally in a laser pro-duced plasmas which are irradiated by a two frequency laser light. This report reviews researches on new accelerator concepts which use an intense laser light. In particular, the difficulties associating with the laser beat wave acceleration are discussed to clarity the future prospects of the laser beat wave accelerator. Some new ideas which overcome the some of above difficulties are also presented.View full abstractDownload PDF (1328K) -
Chikahisa HONDA, Mitsuo MAEDA, Katsunori MURAOKA, Masanori AKAZAKI1987 Volume 15 Issue 7 Pages 495-504
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe techniques of rapid frequency scanning of dye lasers, using electro-optic (EO), acousto-optic (AO) and mechanical scanners, are reviewed. Lasing characteristics in rapid scanning are experimetally and analyti-cally discussed. A novel technique of rapid-frequency-scan (RAFS) laser spectroscopy can determine line-profiles of atoms and molecules instantaneously within a single laser shot. Two types of scanners, an etalon driven by a PZT peizo-electrical element and an EO filter with a KDP crystal, are examined in this RAFS las-er system, Some examples of the RAFS laser spectroscopy to measure atomic line-profiles by a single lasershot are described.View full abstractDownload PDF (1107K) -
Mitsugu HANABUSA1987 Volume 15 Issue 7 Pages 505-513
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe present status of selective area deposition of thin films by laser CVD was reviewed with empha-sis on its relation with reaction mechanisms. When gas-phase photolysis of source gases is utilized, area selectivity is lost because of diffusion of its products over a wide area; this feature may work advan-tageously for such applications as step coverage, however. Deposits with a size comparable with a laser beam can be obtained when surface photolysis is used. Even better localization, a size smaller than the beam size, can be achieved when pyrolytic reactions take place at laser-heated substrate surfaces. To obtain patterned film deposition both direct writing and pattern transfer are available. As an application of area selectivity by laser CVD, fabrication of microlens is explained. Many problems, including the effect of surface migration, are to be clarified before the full capability of laser CVD as an area selective deposition technique is exploited.View full abstractDownload PDF (975K) -
Shin-ichiro KURUMA, Kunioki MIMA1987 Volume 15 Issue 7 Pages 514-522
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe influences of electron beam self fields on the electron orbit and the FEL growth rate are investi-gated. By the numerical analysis of the electron orbit, the suitable region for FEL operation in u-v3 space is shown, where u is the axial invariant of electron motion in the ideal helical wiggler and guide field, and v3 is the axial velocity of the electron. It is also found that the growth rate of FEL does not increase with the increase of the beam current because of the self field effects, when the beam current is greater than the critical value.View full abstractDownload PDF (686K) -
Nobuhisa OHIGASHI, Kunioki MIMA, Shinichiro KURUMA, Syuji MIYAMOTO, Ka ...1987 Volume 15 Issue 7 Pages 523-533
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSFundamental free electron laser experiments with helical wiggler of 2 cm pitc have been done by using high current, low energy electron beam pulse power machine, Reiden III (0.6MeV/40kA/1kA/150ns) at Institute of Laser Engineering, Osaka University. Oscillation frequency variations in one electron shot were measured, and the frequencies can be explained by the theory of Raman regime free electron laser. In the calculation, we considered the beam velocity variation due to beam potential drop and wiggler field gradient in beam cross-section. Frequency spectra of two oscillation frequency modes shifting closely in each other, were obseved simultaneously by slimming the drift tube and decreasing the beam energy. In this case, the frequency spread effect by the beam cross-section appears widely and the measuring frequency spreads were distributed in the region predicted by the theory. Spatial growth rate was obtained as 1 dB/cm with saturation level of 250 kW and spectral peak at 58 GHz.View full abstractDownload PDF (1093K) -
Naohiro TANNO, Hidetoshi FUKUDA1987 Volume 15 Issue 7 Pages 534-540
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThis paper presents a novel aspect of dual-wave-front generation by degenerate four-wave mixing. The dual-wave-front generation referres to simultaneous generation of phase-conjugate and nonconjugate wave-front for a given probe beam, due to the third-order nonlinear polarization. The characteristics of dual-wave-front generation is theoretically studied and is experimentally confirmed using a dye-laser and Na-vapor system. It is also shown that an interesting forward phase-conjugate wave is observed by using a character-pattern in the experiment.View full abstractDownload PDF (680K) -
Masakatsu SUGII, Akio WATANABE, Okihiro SUGIHARA, Keisuke SASAKI1987 Volume 15 Issue 7 Pages 541-550
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSEfficient long-pulse operation of a capacitor-transfer-type XeCI laser with automatic UV preionization has been demonstrated by using a pulse forming network (PFN) in a secondary capacitor circuit. Long-pulse operation with a pulse width of 80 ns full width at half maximum was achieved with an overall efficiency of 2.0% and specific energy of 1.6 Jl-1 atm-1. We have also achieved spectral narrowing to a 0.0015 Å linewidth with an output energy of 400 μJ and with diffraction limited beam divergence using a grating and etalon combination.View full abstractDownload PDF (1034K) -
Chiyoe YAMANAKA1987 Volume 15 Issue 7 Pages 551-553
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
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LasersSodao NAKAI, Kenichi UEDA, Kunihiko WASHIO1987 Volume 15 Issue 7 Pages 554-562
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
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Laser Material Processing, Laser Chemistry and Ultra Fast PhenomenaKeitaro YOSHIHARA, Takayoshi KOBAYASHI, Syunji KISHIDA1987 Volume 15 Issue 7 Pages 563-568
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
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Optical Communications, including Fiber Optics and Sources and Optical Signal Processing, Switching, Storage and BistabilityHiroshi NISHIHARA, Masayuki IZUTSU1987 Volume 15 Issue 7 Pages 569-572
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
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Laser Spectroscopy and Quantum OpticsFujio SHIMIZU1987 Volume 15 Issue 7 Pages 573-575
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
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Laser Fusion and Laser Plasma InteractionSadao NAKAI, Takayasu MOCHIZUKI1987 Volume 15 Issue 7 Pages 576-579
Published: July 28, 1987
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (378K)
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