Stability and amplitude- modulation characteristic of the discharge current, in a DC-pumped, helium-neon gas laser tube

1964 ◽  
Vol 52 (11) ◽  
pp. 1357-1358 ◽  
Author(s):  
V. Met
Keyword(s):  
Amplitude Modulation ◽  
Discharge Current ◽  
Gas Laser ◽  
Modulation Characteristic ◽  
Laser Tube ◽  
Neon Gas ◽  
Helium Neon

Pulsed Helium-Neon Gas Laser Applications

1964 ◽  
Vol 8 (1) ◽  
pp. 3-12 ◽  
Author(s):  
L. L. Antes ◽  
J. Goldsmith ◽  
W. McMahan
Keyword(s):  
Laser Applications ◽  
Gas Laser ◽  
Neon Gas ◽  
Helium Neon

Observation of the multibeam emission of a helium-neon gas laser

1966 ◽  
Vol 8 (1) ◽  
pp. 147-148
Author(s):  
Yu. I. Zaitsev ◽  
D. P. Stepanov
Keyword(s):  
Gas Laser ◽  
Neon Gas ◽  
Helium Neon

Interaction between collinear asymmetric cracks

1972 ◽  
Vol 7 (3) ◽  
pp. 186-193 ◽  
Author(s):  
P S Theocaris
Keyword(s):  
Light Beam ◽  
Monochromatic Light ◽  
Rear Surface ◽  
Thickness Variation ◽  
Shadow Method ◽  
Gas Laser ◽  
Light Rays ◽  
Monochromatic Light Beam ◽  
Neon Gas ◽  
Helium Neon

Thin strips made of perspex and containing two collinear internal cracks of different length were subjected to tension. The thickness variation of the strips was depicted by the reflected-shadow method, in which a coherent monochromatic light beam, emitted from a helium-neon gas laser, was partly reflected from the rear surface of the specimen. The light rays emerging from the plate, which were twice refracted along the thickness and reflected on the rear surface of the plate, were retarded according to Favre's and Neumann's law. The retarded light rays were focused on a caustic surface which depicted the boundary between the constrained area surrounding the crack tip and the remainder of the plate. In this paper two asymmetric collinear internal cracks of different lengths were studied and the interaction between these cracks was evaluated by measuring the variation of the diameter and the distortion of the shape of the caustics for various ratios of crack lengths.

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