108 citations · 429 across the 16 of their papers we have counts for
18 papers
FPGA-based disturbance-observer servo for broadband noise suppression in laser frequency stabilization
Meung Ho Seo, Jae Hoon Lee, Young-Ho Park +7
We have demonstrated broadband frequency-noise suppression in a laser stabilization system by augmenting a conventional proportional-integral-derivative (PID) controller with a dig…
A High-frequency Geodetic VLBI Experiment for Optical Clock Comparison
Monia Negusini, Myoung-Sun Heo, Cecilia Clivati +40
An intercontinental metrological clock comparison between Italy and the Republic of Korea was performed by means of geodetic K-band VLBI observations. The comparison involved the h…
Optical frequency comb integration in radio telescopes: advancing signal generation and phase calibration
Minji Hyun, Changmin Ahn, Junyong Choi +8
Very long baseline interferometry (VLBI) enables high-angular-resolution observations in astronomy and geodesy by synthesizing a virtual telescope with baselines spanning hundreds…
Evaluation of the blackbody radiation shift of an Yb optical lattice clock at KRISS
Myoung-Sun Heo, Huidong Kim, Dai-Hyuk Yu +2
As optical clocks are improved to reach the frequency uncertainty below the 10 level, the frequency shift due to the blackbody radiation (BBR) has been one of the major sys…
Absolute frequency measurement of the 171Yb optical lattice clock at KRISS using TAI for over a year
Huidong Kim, Myoung-Sun Heo, Chang Yong Park +2
We report a measurement of the absolute frequency of the 1S0-3P0 transition in the 171Yb optical lattice clock at KRISS (KRISS-Yb1) for 14 months, which was referenced to the SI se…
Robust frequency stabilization and linewidth narrowing of a laser with large intermittent frequency jumps using an optical cavity and an atomic beam
Won-Kyu Lee, Chang Yong Park, Myoung-Sun Heo +2
An experimental method is developed for the robust frequency stabilization using a high-finesse cavity when the laser exhibits large intermittent frequency jumps. This is accomplis…