Abstract
As is widely recognized, the dephasing of an optical impurity doped in an amorphous host is mainly brought about by the interaction with two level systems (TLS)1). Because the microscopic structure of TLS is not clear and statistically distributed in usual cases, it is quite difficult at present to specify the relevant factors which govern the the relaxation of TLS's in a given material. However, we know that the relaxation is substantially the tunneling of atoms in the material.
© 1991 Optical Society of America
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