Helium-neon lasers have been fabricated using methods and materials particularly suited to high-volume in-line production. Pilot-project results suggest that satisfactory life and performance can probably be achieved in production lasers incorporating pressed or ground soft-glass parts, extensive solder-glass seals, and thin-film-metallization cathodes. The new construction methods suggested should lead to other innovative laser products.
Michael E. Fein and Charles W. Salisbury, "Integrated construction of low-cost gas lasers," Appl. Opt. 16, 2308-2314 (1977)