Displacement metrology directly linked to a time standard using an optical-frequency-comb generator.
Laser-frequency-based displacement metrology and a control system directly traceable to a time standard are developed. The setup is based on a Fabry-Perot (FP) cavity. Two resonant frequencies of the FP cavity are probed for displacement measurement. An optical-frequency-comb generator is utilized to improve the measurement resolution. A displacement resolution of approximately 1.3 nm was achieved, and displacement control using a phase-locked loop was demonstrated.
Bitou
Youichi
Y
National Institute of Advanced Industrial Science and Technology, AIST Tsukuba Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan. y-bitou@aist.go.jp