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Volume 20, Issue 10
Displaying 1-7 of 7 articles from this issue
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Akira MURAI1992 Volume 20 Issue 10 Pages 775-776
Published: October 29, 1992
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (162K) -
Hiroshi SAITO, Toshie OHOTUKI1992 Volume 20 Issue 10 Pages 777-785
Published: October 29, 1992
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSAddition of Cs to the CVL discharge is proposed as a means to achieve a more efficient CVL system. We present a demonstration and analysis of the shortening of the metastable excited-lifetime (0.7μs: Ne buffer gas, 0.8μs: He buffer gas) of the lower laser level on the basis of a collision of the 2nd kind between metastable state Cu and ground state Cs atoms.View full abstractDownload PDF (1245K) -
Muneharu KUTSUNA, Iwao ASANO1992 Volume 20 Issue 10 Pages 786-798
Published: October 29, 1992
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSRecently, many kinds of laser surface treatment have been developed and some of them were used in industry. In the present work, a new laser surface treatment was studied to increase the wear resistance of carbon steels and tool steels by using a 2kW CO2 laser facility attached with a beam rotating optical system. The surface of specimens were laser-remelted in the atmos-pheric environment after graphite spray coating to carbuze the steel. This laser material proces-sing is called hereafter laser carburizing. SNCM616 steel, S58C steel and SKS93 tool steel were remelted after graphite coating of different amounts under argon gas shielding at laser powers of 1.2kW, 1.6kW and 2.2kW. In this process, the carbon content of the fusion zone increased linearly with the amount of coated graphite. SNCM616 steel, which contains 0.19 mass% carbon, increased in carbon content up to 0.95 mass% and Vickers hardness up to 700 Hv after laser carburizing. The great advantage of this laser carburizing-is a time saving process in which only several minutes are enough for the dry hardening process.View full abstractDownload PDF (2971K) -
Atsushi MINATO, Nobuo SUGIMOTO, Yasuhiro SASANO1992 Volume 20 Issue 10 Pages 799-805
Published: October 29, 1992
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSA laser long-path absorption system was developed by using an infrared Raman-shifter pumped by a tunable dye laser. The spectrum of carbon dioxide in the 2-μm region was mea-sured with the system in an open path with a round-trip path length of 1 km. The concentration of CO2 was determined by fitting a theoretical spectrum to the measured spectrum by the least-squares method. The concentration obtained is consistent very well with the data measured with a non-disperse infrared analyzer. The statistical error in the concentration determined by the least-squares method was investigated theoretically. It is shown that the error in the concentra-tion can be estimated from the noise in the spectrum data by an analytical equation. The statis-tical error in the CO2 concentration measured with the present system is estimated to be 0.8 per-cent for a single wavelength scan measurement.View full abstractDownload PDF (893K) -
Kazi Monowar ABEDIN, Akihito WAKAMIYA, Sadao UEMURA, Hiroki NAKATSUKA1992 Volume 20 Issue 10 Pages 806-812
Published: October 29, 1992
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSWe have succeeded in the amplification of semiconductor laser to kilowatt pulses by using a two-stage dye laser amplifier system pumped by a Q-switched Nd: YAG laser. The signal-to-noise ratio of the overall system was about 90 and the overall amplification was of the order of 105. We also investigated the lower limit of input power that can be successfully amplified by a dye cell amplifier. We show that this is a few milliwatts or less, and confirm the feasibility of semiconductor laser amplification by dye cell.View full abstractDownload PDF (743K) -
Igor I. GANCHERYONOK1992 Volume 20 Issue 10 Pages 813-822
Published: October 29, 1992
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSThe propagation behavior of the weak polarized wave in media with laser induced anisot-ropy is theoretically analyzed on the basis of a tensor operator formalism. Functional relation-ships are presented between the nonlinear spectroscopy (saturation and polarization variants) signal (NSS) on one hand and the intensity, arbitrary polarizations and propagation direc-tions of the pump and probe waves, the third-order nonlinear susceptibility (3NS) on the other hand. A novel method for nonlinear polarization spectroscopy (NPS) is proposed that is based on investigating the dependence of polarization alterations of the test wave and its intensity behind the crossed analyzer on the pump beam ellipticity. Detection of the extreme values of the ellipticity allows determination of the real and imaginary parts of the 3NS and their ratio. The polarization conditions are given for which the NSS does not depend on the ellipticity of pumping. The optimum optical density value of the sample is derived for the NPS experi-ments. The results obtained for the polarization dependence of the NPS signal are in good agreement with experimental reports.View full abstractDownload PDF (983K) -
1992 Volume 20 Issue 10 Pages i
Published: October 29, 1992
Released on J-STAGE: March 17, 2010
JOURNAL FREE ACCESSDownload PDF (56K)
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