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Volume 23, Issue 12
Displaying 1-13 of 13 articles from this issue
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Akihiro TANAKA1995 Volume 23 Issue 12 Pages 1025-1026
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (147K) -
Mitsuo MAEDA1995 Volume 23 Issue 12 Pages 1027-1037
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSExcimer lasers and excimer lamps provided efficient and high-power UV sources for applications of laser-induced chemistry and laser processing. After the emission mechanism of excimers and the spectroscopy of excimers were briefly reviewed, excitation methods and system constructions of excimer lasers were described. Especially for discharge-pumped rare-gas halide excimer lasers, detaild description of laser system, gas treatment and simulation analysis was made.View full abstractDownload PDF (1255K) -
Haruhiko NAGAI1995 Volume 23 Issue 12 Pages 1038-1050
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSExcimer lasers and its applications of wide scope are reviewed. Emphasis is placed on the industrial applications from the point of practical uses.
Processsing equipments using excimer lasers and various material processsings such as drilling, cutting and marking based on the ablation principle, optical lithography, annealing, surface modification, thin film preparation, medical applications, and applications using F2 laser are described. Recent results of the Japanese national AMMTRA project are also reviewed.View full abstractDownload PDF (1853K) -
Tatsushi IGARASHI1995 Volume 23 Issue 12 Pages 1051-1055
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSNew ultraviolet and vacuum ultraviolet excimer lamps driven by barrier discharge are reviewed. Ar, Kr, Xe, KrCl and XeCl excimer lamps were developed, whose emission wave lengths are 126, 146, 172, 222, and 308nm, respectively. These spectra have full width at half maximum (FWHM) as narrow as 2 to 14 nm. An efficiency of 10% was obtained with a Xe excimer lamp. The principle, structure and application of lamps are described.View full abstractDownload PDF (543K) -
Wataru SASAKI1995 Volume 23 Issue 12 Pages 1056-1067
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSNew excimer sources in VUV spectral region have been reviewed in this paper, where rare gas excimers and ionic alkali halide excimers were focused on. Electron beam pumped rare gas excimer lasers were developed as coherent light sources. Their applications to materials processing were explored in detail. Rare gas jet excimer lamps and silent discharge excimer lamps were discussed as incoherent light sources. Ionic alkali halide excimers excited by a laser-produced plasma were also discussed. Possible applications of VUV excimer light were presented.View full abstractDownload PDF (755K) -
hotochemical Reaction of Plutonium and Neptunium and Photochemical Dissolutionof Uranium DioxideYukio WADA, Hiroshi TOMIYASU1995 Volume 23 Issue 12 Pages 1068-1080
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe photochemical reaction mechanisms of Pu and Np dissolved in a nitric acid solution and features of their reactions are described based on our experimental data obtained by the irradiation of UV light using a Hg lamp. The suitable valences of Pu and Np for the separation and coextraction were adjusted to the conditions of Pu (IV, VI) -Np (V) and Pu (IV, VI) -Np (VI), respectively, using the photochemical reactions. The separation and coextraction of Np from/with Pu were carried out by the solvent extraction using 30% TBP/n-dodecane after/during the photochemical valence adjustment. As for the other application technique of the photochemical reaction, the photochemical dissolution technique using the strong oxidative ability of the nitric acid species photochemically excited was also described.View full abstractDownload PDF (532K) -
Isamu MIYAMOTO, Hideaki HAYASHI1995 Volume 23 Issue 12 Pages 1081-1089
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSRemoval process of thin Cu film deposited on PMMA substrate by excimer laser was analyzed on the basis of thermal conduction theory and high speed photographing. At optimized laser fluences, the film was removed mainly in the liquid state. The film was then heated up to the temperatures just below the boiling point of Cu, was accelerated towards the center of the irradiated zone by the surface tension acting at the edge of the molten zone, and was eventually broken into small droplets to fly radially away outwards by the inertia of the molten metal. At excess fluences, the increased recoil force pressed the molten film to provide radialmolten metal flow. Then the radial flow expanded the removed region, and eventually peeled the surrounding film. The peeling was prevented by using a substrate having higher adhesion to the Cu film.View full abstractDownload PDF (1390K) -
E.V. SLOBODCHIKOV, Jangseok MA, Keitaro YOSHIHARA1995 Volume 23 Issue 12 Pages 1090-1095
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSWe report the amplification of a Kerr-lens mode-locking cavity-dumped frequency-doubled chromium-doped forsterite laser in a six-pass bow-tie dye amplifier pumped by a diodepumped Q-switched frequency-doubled Nd: YLF laser. This system generates the energy of 0.6μJ per pulse and a pulse duration as short as 43 fs (FWHM) at the wavelength of 630 nm with a repetition rate of 4 kHz. The amplified pulses were used to generate a continuum in a fused silica plate.View full abstractDownload PDF (641K) -
Tetsuya SAKAI, Kuniharu HIMENO, Akira WADA, Ryozo YAMAUCHI1995 Volume 23 Issue 12 Pages 1096-1102
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA polarization-maintaining erbium-doped fiber (PM-EDF) based on the PANDA (Polarization-maintaining AND Absorption-reducing) type fiber technology has been developed as an amplification medium of a polarization-maintaining optical amplifier for 1550 nm band. Detail amplification and polarization characteristics of the PM-EDF have been evaluated for the first time. The carefully designed PM-EDF amplifies the optical signal with a high gain and low noise figure, keeping the state of polarization through the fiber. The amplification performance of the newly developed PM-EDF is the same as that of the conventional erbium doped amplifiers except the polarization characteristics. The achieved characteristics are 35 dB gain for small signal, 4.8 dB noise figure, 70% slope efficiency, 30 dB of polarization extinction ratio even in a fiber coil of 15 mm in diameter. Polarization hole burning is also reported.View full abstractDownload PDF (795K) -
Takeshi YOKOZAWA, Hiroshi HARA1995 Volume 23 Issue 12 Pages 1103-1112
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSWe have studied the lasing characteristics of a Tm: YAG laser pumped by a laser diode. The maximum output power of 157 mW and a slope efficiency of 44 % were achieved for a 3% Tm: YAG laser crystal at a crystal temperature of -10°C. A small signal gain and a saturation parameter of the 3% Tm: YAG laser were calculated by using the output power as a function of the reflectivity of a coupling mirror. The lasing spectrum shifted towerd short wavelengths from 2.01 mm and the width of the lasing spectrum decreased with decreasing temperature.View full abstractDownload PDF (1128K) -
Masanori JYUMONJI, Haruo UCHIYAMA1995 Volume 23 Issue 12 Pages 1113-1123
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSince dye lasers are very widely tunable from near ultra-violet to near infrared, so that it had been used in high resolution spectroscopy and many other applications. A linear flashlamppumped dye laser is very useful for its low cost and high output power or high energy, as well as a good beam quality and sharp tunability. However, several flashlamps are required for excitation in order to obtain an output energy over several joules. We have achieved a dye laser output of 18 J with a single flashlamp, by employing a multi-stage Marx-bank driver and optimizing the output mirror reflectivity as well as by choosing appropiate dye cell size and the dye concentration.View full abstractDownload PDF (613K) -
Fumio MURAKAMI, Yoichi OHMURA, Masafumi HAYASHI, Tatehisa OHTA1995 Volume 23 Issue 12 Pages 1124-1130
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSLaser Doppler vibrometer was built by using a two-mode stabilized He-Ne laser. The laser supports two orthogonally-polarized axial-modes which generate an inter-mode beat frequency of 724 MHz. These two modes serve as sensing and reference light. To detect instantaneous Doppler frequency shift, a novel demodulation scheme was proposed. The frequency shift is detected by a delayed self-homodyne technique. The delay is provided via an optical fiber. The performance of the demodulator was investigated theoretically and experimentally.View full abstractDownload PDF (311K) -
Jun ZHOU1995 Volume 23 Issue 12 Pages 1131-1135
Published: December 28, 1995
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA new method has been developed for pulse squeezed light generation in parametric process by using low repetition pulse laser. With this new technique, it becomes very easy to realize the condition for obtaining substantial squeezing, i. e. the damping constant for pump field should be much smaller than that for the parametric signal field. This condition, however, was difficult to be realized with conventional experimental setup by using low repetition pulse laser. Semiclassical approach indicates that deep degree squeezing may be obtained over a wide frequency range by increasing the ratio of the dumping constant for signal field to that for the pump field in the new experimental setup. At the same time, the conversion efficiency of the second-harmonic generation can also be increased remarkably by this new method in the squeezed light generation process.View full abstractDownload PDF (223K)
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