NCTS (South)


DATE2016-05-23

TIME12:10

PLACER49223, Second Physics Building , NCKU

FIELDQuantum Information Science

SPEAKER Prof. Wang-Yau Cheng(鄭王曜) - 中央大學物理系

TITLEThe recent achievements in “high-precision measurement” and the impact on atomic physics

ABSTRACTOptical frequency standards based on Rubidium and Cesium atom two-photon transitions are long recognized as reliable secondary optical clocks. We found that the cesium atom from Max Planck Institute, T. Hansch’s group, has slightly different spectral features from that in Taiwan, which surprised and puzzled scientists (see: Spotlight on Optics by Optical Society of America: http://www.opticsinfobase.org/spotlight/summary.cfm?URI=ol-38-16-3186). Recently, we had observed some strong evidences that might reveal the truth for what happened to cesium atom. We will present our experimental data in this talk. Moreover, we have recently developed a convenient approach of optical offset locking, by which we applied the technique to two free-running semiconductor lasers that resulted in sub-mini Hz (<0.001 Hz) beatnote linewidth over 35-MHz offset frequency, which might be used for comb laser applications as well as some quantum-interference experiments like electromagnetic induced transparency.