Abstract
This chapter describes the Elliott P. C. Helium neon gas laser. The standard hemispherical cavity provides a uniphase output for this laser. A second spherical reflector obtainable as an optional extra may be easily fitted to provide a confocal resonator. An iris diaphragm mounted within the cavity adjacent to the concave mirror provides additional mode discrimination, particularly necessary in confocal operation. Extraneous light from the plasma tube in either case may be practically eliminated with the iris diaphragm. In its light compact cylindrical housing, the laser forms a convenient source of coherent monochromatic light, ideally suited for optical bench mounting. A simple but precise attachment is provided for this purpose. Alternatively the laser will stand directly on a laboratory bench. The cylindrical housing is connected by means of a single coaxial cable to a versatile direct current power supply, which utilizes solid state rectifiers and allows continuous adjustment of tube current by means of a variable transformer. This unit can be used to drive other gas lasers of similar characteristics when required.
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