1. Fetterman H.R., H.R. Schlossberg and G.A. Koepf, unpublished talks at the Second international Conference and Winter School on Submm Waves and their Applications, San Juan (1976).
2. Submillimeter‐wave laser operating in a passiveQ‐switched intracavity pump mode
3. Schlossbero H.R. & H.R. Fetterman. U.S. Patent 4126832 (1978).
4. A TEM00far infrared laser with integrated pump laser