The Review of Laser Engineering

[title in Japanese]

Koichi TOYODA

1989 Volume 17 Issue 6 Pages 403-404
Published: June 28, 1989
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.17.6_403

JOURNAL FREE ACCESS

Download PDF (154K)
Long-Pulse Dye Laser Pumped by Linear Flashlamp

Haruo UCHIYAMA, Masanori JYUMONJI

1989 Volume 17 Issue 6 Pages 405-409
Published: June 28, 1989
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.17.6_405

JOURNAL FREE ACCESS

Show abstractHide abstract

This paper describes a long-pulse and high-energy dye laser. The use of an oxygen-saturated Rhodamine 6G methanol solution pumped by an argon-filled linear flashlamp and a confocal resonator permits long-pulse operation with a pulse duration of 95 μs and an output energy of 830mJ at a conversion efficiency of 0.18%.

View full abstract

Download PDF (427K)
Distortion of 3-Dimensional Object Produced by Laser Lithography

Yoji MARUTANI, Takashi NAKAI

1989 Volume 17 Issue 6 Pages 410-416
Published: June 28, 1989
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.17.6_410

JOURNAL FREE ACCESS

Show abstractHide abstract

We developed an optical machining system that fabricates steric objects automatically by stacking plastic layers by scanning a UV laser beam on liquid photopolymer. Some distortions are found along the lower side of the fabricated objects but they are only a noticeable problem of this system. Many experiments carried out under various conditions, by changing a speed of laser scan, thickness of layers, and irradiation power, revealed that the shrinkage of the photopolymer results in deformation. We propose a new hypothesis, that is, the speed of photopolymerization is the second major cause of this curious disortion.

View full abstract

Download PDF (909K)
Supersonic CO₂ Mixing Laser with N₂ Glow Discharge in Coaxial Nozzles

Kazuo MAENO, Naohito YAMAGUCHI, Yutaka HANAOKA

1989 Volume 17 Issue 6 Pages 417-424
Published: June 28, 1989
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.17.6_417

JOURNAL FREE ACCESS

Show abstractHide abstract

To investigate the characteristics of an electric discharge CO₂ mixing gasdynamic laser, a coaxial supersonic screen nozzle array is tentatively designed. Isentropic relations on gas flow are assumed for the design of conical and coaxial nozzles. A small signal gain coefficient andflow parameters were measured. Further numerical analysis on the small signal gain was made by assuming a steady, inviscid, quasi-one-dimensional vibrationally nonequilibrium flow, and a three-mode relaxational model with a constant discharge efficiency. Measured and calculated results show that this supersonic mixing CO₂ electric discharge laser can achieve high-gain operation.

View full abstract

Download PDF (715K)
Basic Experiment of Partial Solidification of a Thermosetting Resin with an IR Laser

Yoji MARUTANI, Takashi NAKAI

1989 Volume 17 Issue 6 Pages 425-428
Published: June 28, 1989
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.17.6_425

JOURNAL FREE ACCESS

Show abstractHide abstract

To develop an automatated system producing steric objects, the solidification of a thermosetting resin was examined by scanning the IR laser. Experiments carried out at various laser powers and scanning rates, revealed that the resin can be solidified in a short time to shape the objects and that an overmuch power density gives rise to overall solidification of the resin. This method may provide a new technique for manufacturing plastic models.

View full abstract

Download PDF (643K)
[title in Japanese]

1989 Volume 17 Issue 6 Pages plate1
Published: June 28, 1989
Released on J-STAGE: March 17, 2010

DOIhttps://doi.org/10.2184/lsj.17.6_plate1

JOURNAL FREE ACCESS

Download PDF (2897K)

Register with J-STAGE for free!