All issues
Volume 22, Issue 6
Displaying 1-6 of 6 articles from this issue
- |<
- <
- 1
- >
- >|
-
Osa MATSUMOTO1994 Volume 22 Issue 6 Pages 437-438
Published: June 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSDownload PDF (157K) -
Toshifumi HASAMA1994 Volume 22 Issue 6 Pages 439-447
Published: June 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA wide-aperture x-ray preionized XeCl laser with a capcitor-transfer-type excitation circuit is described. The characteristics of an x-ray generator is investigated through the measurements of x-ray dose, x-ray pulse shape, electron-beam current and acceleration voltage. It is found that the x-ray dose, the peak electron-beam current and the peak acceleration voltage are proportional to the 3.1 power, the 2.1 power and the 0.6 power of charging voltage, respectively. The maximum output energy of 2.7 J is extracted with an electrical efficiency of 1.4% from an active volume of 3cm× 5 cm×80 cm. The highest electrical efficiency of 2.3 % is achieved with an output energy of 2.2 J by the optimization of the primary and secodary capacitances.View full abstractDownload PDF (1164K) -
Differential Absorption Lidars for Measuring Atmospheric Minor Constituents Related to Earth WarmingMichihiro UCHIUMI, Mitsuo MAEDA1994 Volume 22 Issue 6 Pages 448-459
Published: June 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSAtmospheric minor constituents related to earth warming have many absorption lines in the IR region. Recent progress in high power IR tunable lasers makes the detection of these species possible by the differential absorption lidar (DIAL). This paper describes the theoretical analysis of the detection range of the IR range-resolved DIALs. At first, the detection ranges are generally calculated over a wavelength range from 200 nm to 16μm. For the ideal absorption line strength, the typical detection range in IR is 3-4 km in the vertical distribution measurement, but it increases to 10 km in the horizontal distribution measurement. Based on the HITRAN database, we surveyed useful absorption lines for DIAL measurement in the 1-5μm range, and found that CO2, CH4, N2O and CO were detectable besides H2O. Detailed simulation of the DIAL measurement was made for each of the absorption lines of these molecules, and it was shown that the range-resolved DIAL method was useful for the detection of these four species.View full abstractDownload PDF (1356K) -
Yoshinobu MAEDA, Masatoshi MIGITAKA1994 Volume 22 Issue 6 Pages 460-465
Published: June 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSBistable optical device was demonstrated by using the longitudinal mode hopping of a laser diode and a narrow spectral transmission characteristic of an interference filter. Since a hysteresis characteristic exists in the relationship between the wavelength and the injection current of the laser diode, an optical bistability was observed in this system. In this device changes in the wavelength of the laser diode are converted into changes in intensity by the transmission through a filter. Exclusive OR operation of the device was observed with the use of ternary logic level. In addition, an optical switch-off phenomenon was confirmed by directly injecting a pulse of 500 psec wide from an external dye laser.View full abstractDownload PDF (729K) -
formance Characteristics of a 20 kW CO LaserShizuma KURIBAYASHI, Osamu NODA, Motoe KONDO, Shigenori IMATAKE, Keiic ...1994 Volume 22 Issue 6 Pages 466-473
Published: June 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA 20 kW class CW CO laser has been designed and constructed to demonstrate the capability of CO laser as a high power laser and to study its industrial applications.
In this system, a transverse self-sustained dc glow discharge is applied as ex6itation, and a laser gas miXture is cooled and controlled through heat exchangers operating with liquid N2 and it's temperature is controlled by heaters.
Using a stable resonator, 21 kW laser output was obtained with an electrical conversion efficiency of 22%for a mixture of CO/N2/He/O2=6/16/78/0.2 (%) at 150 K, 40 Torr and 22 m/s.View full abstractDownload PDF (1069K) -
Takeyoshi NAKAYAMA, Kazuyuki OKADA, Uichi KUBO1994 Volume 22 Issue 6 Pages 474-478
Published: June 29, 1994
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSurface modification of ceramics has been achieved by laser irradiation. A thin copper film deposited on SiO2 substrate was irradiated with KrF excimer laser light. Adhesion between the film and the substrate was strongly enhanced by laser irradiation. Results of an X-ray Photoelectron Spectroscopy (XPS) indicate that this enhanced adhesion is due to a formation of the chemical bond between laser-implanted copper atoms and oxygen atoms in SiO2. Namely, a copper metal layer and a copper oxide layer were formed on the surface of SiO2. This method realizes the conductive layer on insulating materials.View full abstractDownload PDF (856K)
- |<
- <
- 1
- >
- >|