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Volume 8, Issue 2
Displaying 1-15 of 15 articles from this issue
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Jiro YAMAGUCHI1980 Volume 8 Issue 2 Pages 343-344
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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Toshio GOTO1980 Volume 8 Issue 2 Pages 345-357
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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Takeo MIYATA1980 Volume 8 Issue 2 Pages 358-369
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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Mitsuo SUMIYA, Katsunobu UEDA, Tameyasu TSUKADA, Naomi HOSHINA1980 Volume 8 Issue 2 Pages 370-378
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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Nobukatsu TAKAI, Toshimitsu ASAKURA1980 Volume 8 Issue 2 Pages 379-387
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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Kouzaburo SIBAYAMA, Haruhiko NAGAI, Akio NAGAI1980 Volume 8 Issue 2 Pages 388-395
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSSmall-signal gain of a transversely excited gas-transport CO2 laser was measured as a function of species and ratios of gas mixture. Buffer gases of N2, He, CO and Ar were studied under sealed-off conditions operating at pressures of 250 Torrand 350 Torr. Maximum gain was obtained when the laser gas composition was CO: CO2: N2: He: Ar = 0.5: 1.5: 3: 5: 5. Lack of N2 or He causes a substantial decreace in small-signal gain in the gas mixture of CO, CO2, N2 and He.
It is shown that Ar is more effective than He to enhance small-signal gain. Small-signal gain is not so affected by an addition of a small amount of CO. The addition of CO makes a glow discharge stable but the addition of Ar tends to make it unstable.View full abstractDownload PDF (757K) -
Hidenori OSADA, Koichi TOYODA, Susumu NAMBA1980 Volume 8 Issue 2 Pages 396-406
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSA pulsed high power HBr chemical laser of output energy of 1.4 J and peak power of about 1 MW at wavelengths between 4.0-4.7 um has been designed and constructed. Characteristics of output energy, oscillation wavelength and waveforms are measured and discussed concerning with the variations of the mixing ratio of the component gases and applied voltage, dependency of reflectance of output mirrors and plasma length. The effects of additions of He and Ar are also discussed. The addition of Ar is found to be effective to obtain the high output energy.View full abstractDownload PDF (809K) -
Noboru KAMIDE, Katumi TOKUDOME, Michio ISHIKAWA, Yuji HAYASHI, Toshiak ...1980 Volume 8 Issue 2 Pages 407-414
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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Case of the Use of Q-Switched Ruby LaserTatsumi SATO, Hirofumi FUJIWARA, Kazumi MURATA1980 Volume 8 Issue 2 Pages 415-425
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSIn high speed holography the light reflected by a moving object suffers the Doppler effect, so that the interference pattern to be recorded on the hologram plate will in general reduce its contrast. To obtain the brightly reconstructed image, the allowable velocity of the object will be limited.
This limtatation was relaxed by using the frequency chirping of a Q-switched ruby laser as light source of holography. The allowable velocity and the the velocity range of the object were experimentally attained by five to six times and by two times comparedwith the results obtained by traditional methods, respectively.View full abstractDownload PDF (1383K) -
Hiroshi NISHIHARA, Yasumi NISHI, Jiro KOYAMA, Noritake HOHKI, Fumihiko ...1980 Volume 8 Issue 2 Pages 426-429
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThis is the first report of the successful measurement of the pulsed blood velocity in the right femoral artery of a mongrel dog, using a laser doppler velocimeter with anoptical fiber pick-up. A 150-m long fiber was used to reach the animal experiment laboratory from the measuring setup. The features of the velocimeter are the flexible access to objects and the high spatial resolution (∼100um).View full abstractDownload PDF (684K) -
Shunji SUZUKI, Yuko ISHIBASHI, Chikara TAKEUCHI, Minoru OBARA, Tomoo F ...1980 Volume 8 Issue 2 Pages 430-433
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSFast discharge N2 and HF lasers were efficiently excited by a novel stripline, multichannel-surface-spark-gap-type, low-impedance Mark generator which is simple, compact, and scalable. For an HF laser using a mixture of SF6 and C2H6, a volmetric energy of 4 J/l and an electrical efficiency of 2 % were obtained with high energy loading of∼200 J/l.View full abstractDownload PDF (362K) -
Tatsuhiko HASHIMOTO, Tokihiko OGURA, Fumihiko KANNARI, Minoru OBARA, T ...1980 Volume 8 Issue 2 Pages 434-437
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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Hiroyuki ISHIDA, Shuzo HATTORI1980 Volume 8 Issue 2 Pages 438-446
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
JOURNAL FREE ACCESSThough He-Ne lasers became popular even for high school students, scarce reportas to make them ready at hand in a high school and college education program can be seen.In this paper new physical experiments for student training using lasers are described with evaluation of accuracy and the remarkes in training practice.
In geometrical optics field, an educational program of it in connection to the linear algebra is proposed and experiments for new geometrical optics are described. In physical optics region, experimental devices for the education of interference and diffraction are described.In material constant measurement field, refractive indices measurements from Brewster angle and critical angle of total reflection, both using lasers are reported.View full abstractDownload PDF (996K) -
1980 Volume 8 Issue 2 Pages 447-459
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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1980 Volume 8 Issue 2 Pages 460-464
Published: March 31, 1980
Released on J-STAGE: February 26, 2010
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