T violation and microhertz resolution in a ring laser.
A He-Ne ring laser has given the Earth-rotation-induced Sagnac frequency to a precision of 1 microHz, or 2 parts in 10(8), 2 x 10(-21) of the laser frequency. Because the beat frequency in a ring laser originates in either timereversal or (with a more complicated polarization geometry) parity-violating effects, such systems have the potential of detecting ultrasmall symmetry violations.
G E
GE
Stedman
M T
MT
Johnsson
Z
Z
Li
C H
CH
Rowe
H R
HR
Bilger