The Review of Laser Engineering
Online ISSN : 1349-6603
Print ISSN : 0387-0200
ISSN-L : 0387-0200
Search
Advanced search
OR
Browse
Search
Volume 19, Issue 12
Displaying 1-8 of 8 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • [title in Japanese]
    Joichi AOI
    1991 Volume 19 Issue 12 Pages 1117-1118
    Published: December 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.12_1117
    JOURNAL FREE ACCESS
    Download PDF (154K)
  • Phase-Unifying Resonator and Its Applications to Material Processing
    Masaki KUZUMOTO, Yushi TAKENAKA, Koji YASUI, Shigenori YAGI, Masaharu ...
    1991 Volume 19 Issue 12 Pages 1119-1126
    Published: December 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.12_1119
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A high power CO2 laser equipped with an unstable resonator with a phase-unyifying output coupler has been developed to produce a highly focusing laser beam. The output coupler composed of a partial-reflection region in its center sorrounded by an antireflection region unifies the phases of laser beams passing through these regions. A linearly polarized, diffraction limited beam of 5kW with a divergence angle of 0.6mrad can be extracted stably. The laser beam is successfully applied to high speed welding and cutting.
    View full abstract
    Download PDF (1047K)
  • Development of a Classical Maser Utilizing Superconducting Cavity
    Keizo KATO, Kuniharu TAKAHASHI, Kazuo MINAMI, Mitsuru AWANO
    1991 Volume 19 Issue 12 Pages 1127-1136
    Published: December 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.12_1127
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The studies on a high-power microwave pulse source utilizing a superconducting cavity are described. A great amount of RF energy can be stored in a superconducting cavity by a CW solid-state oscillator with small output. The stored energy can be released within a short time to an output circuit by a switching mechanism, resulting in a high-power microwave pulse which may not be available by usual CW solid-state oscillators. Microwave pulses are extracted from the cavity by using three different kinds of switches: a mechanical and a discharge switches and superconducting thin films.
    View full abstract
    Download PDF (1137K)
  • Polarization Properties of a Synchronously Pumped Dye Laser
    Iwao KITAZIMA, Tsuyoshi SHIOMI
    1991 Volume 19 Issue 12 Pages 1137-1144
    Published: December 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.12_1137
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A rhodamine 6G (RH-6G) dye laser was actively mode-locked by synchronous pumping using a frequency-doubled mode-locked Nd3+ glass laser. Output light intensities and polarization were measured as a function of the pumping power and dye concentration. Dye laser pulses were observed with a streak camera of 8 ps resolution. The laser pulse width decreased down to the minimum value of 18 ps as the degree of polarization increased up to the maximum value of 0.75. The addition of DODCI as a saturable absorber enhanced the degree of polarization up to 0.9.
    View full abstract
    Download PDF (854K)
  • Breakdown of Pulse Discharge in Capacitor Transfer Type Excimer Laser Devices
    Takeki SAKURAI, Fujiko TATSUMI, Hirokazu HORI, Yukio INOUE
    1991 Volume 19 Issue 12 Pages 1145-1152
    Published: December 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.12_1145
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The breakdown voltage and the breakdown time of pulse discharge in capacitor-transfer type excimer laser devices are measured under various experimental conditions. The experimental results show that the breakdown voltage-time area Sb and the electron drift length l are constant at a fixed gas density n and a distance between electrodes d. It is also obtained from the experiments made at different values of n and d that Sb is proportional to n0.4 d and l is proportional to n-0.6. These results are not explained by the breakdown culculated based on a streamer theory by using known data of the first ionization coefficient of gas. When the first ionization coefficient is assumed to be proportional to 1/[d(E/n)/dT], theoretical results are in good agreement with the experimental results and the total ionization number leading the gas breakdown is always nearly constant.
    View full abstract
    Download PDF (911K)
  • Spectroscopic Method for Atmospheric Trace Species Measurement Using a Satellite Retroreflector (RIS)
    Atsushi MINATO, Nobuo SUGIMOTO, Yasuhiro SASANO
    1991 Volume 19 Issue 12 Pages 1153-1163
    Published: December 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.12_1153
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    A simple and effective spectroscopic method based on earth-satellite-earth laser long path absorption measurements using RIS (Retroreflector-In-Space) on the ADEOS satellite, has been developed. This method utilize the Doppler shift of a reflected beam resulting from the satellite movement for measuring the atmospheric transmission spectra. The feasibility of a system using carbon dioxide lasers was evaluated by a computer simulation. The result shows that the vertical profiles of ozone, methane, and the column densities of CFC12, HNO3, CO and N2O can be measured by using the fundamental, second and third harmonics of TEA lasers with 12C16O2 and 13C16O2 isotopes. The signal-to-noise ratio of single shot optical detection is estimated to be 12-5000 depending on the satellite position for pulse energies of the fundamental, second and third harmonics of 100mJ, 10mJ, and 5mJ.
    View full abstract
    Download PDF (896K)
  • [title in Japanese]
    [in Japanese]
    1991 Volume 19 Issue 12 Pages 1164-1165
    Published: December 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.12_1164
    JOURNAL FREE ACCESS
    Download PDF (741K)
  • [title in Japanese]
    [in Japanese], [in Japanese]
    1991 Volume 19 Issue 12 Pages i
    Published: December 29, 1991
    Released on J-STAGE: February 26, 2010
    DOIhttps://doi.org/10.2184/lsj.19.12_i
    JOURNAL FREE ACCESS
    Download PDF (1615K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top