Abstract
The vibration-free cryocooler remains one of the key components in the Large-scale Cryogenic Gravitational wave Telescope (LCGT). Accordingly, reviewing the design and results of the vibration-free cryocooler for the Cryogenic Laser Interferometer Observatory (CLIO) (prototype of the LCGT) would be useful for development of the LCGT. At the same time, the development of the pulse-tube cryocooler is now progressing to a stage where it is more powerful with less vibration. In this paper, the past development of the vibration-free cryocooler system for CLIO, and new technologies of the vibration-free cryocooler are presented.
