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Volume 19, Issue 3
Displaying 1-9 of 9 articles from this issue
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Tetsuma OZAWA1991 Volume 19 Issue 3 Pages 219
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
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Koji SUGIOKA, Hideo TASHIRO, Koichi TOYODA1991 Volume 19 Issue 3 Pages 220-229
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSVarious aspects of the metal surface modified by the photochemical reaction induced by an excimer laser are reviewed. The doping and deposition of Si occurs simultaneously by irradiating stainless steel 304 placed in a SiH4 or Si2H6 gas atmosphere with KrF excimer laser. Since Si atoms distribute continuously from the substrate regions to the deposited films, the Si films have very high adhesion strength. The specific process for surface modification is referred to as laser implant-deposition (LID). By the LID process, surface coloring of the stainless steel 304 is realized, and also surface handness and resistance to corrosion in acid solutions are greatly improved.View full abstractDownload PDF (1051K) -
Iwao KITAZIMA, Yukihiko HATTORI, Hiroshi IWASAWA, Yong Pyung KIM1991 Volume 19 Issue 3 Pages 230-239
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe vibrational energy relaxation was measured in several Torr SF6 by a pump-probe method using two tunable TE CO2 lasers. The transmitted intensity of the probe beam through an SF6 gas cell was measured by changing the probe wavelength and the time delay up to 400μs between the pump and probe pulses. The 10.6μm P (30) pump intensity was 0.4J/cm2. The probed spectra are divided into two parts: induced transmission at P(8)-P(22) and absorption at P(24)-P(36). The time dependence of induced signals are composed of 4 regions: Ist period (≤1μs) related to multiphoton excitation, IInd (1-50μs) due to collisional V-T relaxation, IIIrd (50-110μs) from molecular expansion and diffusion, and IVth (≥100μs) restricted by gascooling. The effects of a gas pressure and a pump intensity on the induced signals were also investigated with the P(30) (or P(14)) pump line.View full abstractDownload PDF (1087K) -
Akira SASAKI, Masato NAKAYA, Hiroshi HOSODA1991 Volume 19 Issue 3 Pages 240-246
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA self-optogalvanic effect in the laser positive column of internal-mirror He-Ne lasers is investigated both experimentally and theoretically. The effect of laser power fluctuation on the voltage across a laser discharge tube and its dependence on laser currents (3-7 mA) are observed. A general model based on the steady-state solution of rate equations is developed to interpret the measurements. Good agreement between experimental and calculated results is obtained.View full abstractDownload PDF (566K) -
Yoshinobu IZUMI, Kimiko EMA, Tadashi YAMAMOTO, Shunichi KAWANISHI, Yui ...1991 Volume 19 Issue 3 Pages 247-253
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSActinometry of intense UV lights from ArF, KrF and XeF excimer lasers has been studied with a ferrioxalate chemical actionometer. The relation between the number of photons per pulse (N) and the absorbance change per pulse (ΔA) at 510 nm is expressed by using a first-order function, N=a·ΔA-b. (a, b: numerical constants characterized by a laser-wavelength). The experimental errors in this method were 4.8, 5.2, and 1.6% for ArF, KrF and XeF excimer lasers, respectively. The results prove that the ferrioxalate chemical actinometer is satisfactorily usable as an actinometer for excimer lasers.View full abstractDownload PDF (858K) -
Osamu ERYU, Hiroshi CHIBA, Kouichi MURAKAMI, Kohzoh MASUDA1991 Volume 19 Issue 3 Pages 254-260
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThe improvement of electrical properties of YBa2Cu3Oy thin films by second laser irradiation was observed. Clusters in laser plume formed by the ablation laser are decomposed to small particles by second laser irradiation with suitable delay time to ablation laser pulse. Mechanism of ablated particle deposition of oxide superconductor thin films controlled by the second laser irradiation is discussed on the basis of dynamics of laser ablated particles.View full abstractDownload PDF (719K) -
Hironari YAMADA1991 Volume 19 Issue 3 Pages 261-269
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSWe propose a Photon Storage Ring (PhSR), which is a novel free-electron laser (FEL) composed of a compact synchrotron radiation (SR) source and a cylindrical mirror surrounding the electron orbit. The SR source is an exactly circular type and the mirror is concentric to the electron orbit. In this scheme SR is reflected back tangentially to the electron orbit by the cylindrical mirror and interacts with the electrons, leading to the laser oscillation. The PhSR posesses many ideal features: since SR is confined by the mirror then all the radiations emitted at an angle to the electron orbit exibit good coherency; since the interaction occurs continiously along the electron orbit, a large gain is expected; and since all radiations are extracted through a simple opening, an extraction efficiency is fairly high. Compared with a conventional FEL, PhSR is capable of generating a high laser power by using a relatively small accelerator with a small electron beam current.View full abstractDownload PDF (1052K) -
Yoshiyuki KAWAMURA, Nobuhisa OHIGASHI, Yoshiaki TSUNAWAKI, Kunioki MIM ...1991 Volume 19 Issue 3 Pages 270-279
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (1154K) -
1991 Volume 19 Issue 3 Pages plate1
Published: March 29, 1991
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (1916K)
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