Construction of Single-Mode D.C. Operated He/Ne Lasers

Abstract
Methods of construction of d.c. operated He/Ne laser tubes using optical contact bonds are described. Optimum values of various parameters for operation at 632.8 mm have been establised and a robust single-mode laser is described which is very suitable for use as a light source in interferometry. It is relatively easy to construct and can be dismantled for major maintenance such as refilling.

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