We describe the design, construction, and performance of a resonant cryogenic chopper that operates at 4.2 K. The chopper is mechanically and thermally robust; it can occult a 2.54-cm aperture at 4.5 Hz while dissipating ~1 mW. Both the stator and rotor magnetic fields are controllable to allow for performance optimization and to help in measuring any possible interference effects. Data on long-term amplitude stability are presented.
© 1992 Optical Society of America
Lyman A. Page, Edward S. Cheng, and Stephan S. Meyer, "Resonant cryogenic chopper," Appl. Opt. 31, 95-100 (1992)