Observation of Spin Polarized Clock Transition in 87Sr Optical Lattice Clock
Observation of Spin Polarized Clock Transition in 87Sr Optical Lattice Clock作者机构：National Institute of Metrology Beijing 100013 Department of Precision Instrument Tsinghua University Beijing 100084
出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)
年 卷 期：2014年第31卷第12期
页 面：45-48页
核心收录：
学科分类：080903[工学-微电子学与固体电子学] 070207[理学-光学] 07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0803[工学-光学工程] 0702[理学-物理学]
基 金：Supported by the National Basic Research Program of China under Grant No 2010CB922902 and the National Natural Science Foundation of China under Grant No 91336212
主 题：SPIN polarization OPTICAL lattices PHASE transformations (Physics) LASER cooling FERMIONS SEMICONDUCTOR lasers
摘 要：Atomic clocks operating at optical frequencies, with much better accuracy compared with microwave atomic clocks, have been assumed to be the next- generation time and frequency standards, Many applications will benefit from this lower frequency un- certainty of optical clocks, such as the re-definition of ＇the second＇, i.e. one of the seven base units of the international system of units （SI）, test of the time variation of fundamental physical constants and rel- ativity geodesy. Recently, the neutral atom lattice clock has achieved a lower frequency uncertainty com- pared with the optical ion clock, mainly due to the im- provement of the clock laser frequency stability refer- enced to a long high-finesse ULE cavity and the more accurate evaluation of black-body radiation shift. Strontium is an excellent candidate for the neutral atom optical clock. For the fermionic isotope of stron- tium, it has intrinsically less collision shift and the first order Zeeman shift can be removed by an inter- leaved probing ***, through the pre-cise measurement of the polarizability of strontium, the black body radiation （BBR） shift of the stron- tium lattice clock, which remains to be the limitation factor of its total frequency uncertainty, is reduced to a lower 10^-18 *** instability of the strontium lattice clock has reached 3.1 × 10-16/√T, showing the significant advantage over the single ion optical clock. The total systematic uncertainty has reached 6.4 × 10^-18 in fractional frequency, which is the best among all optical clocks until now.
维普期刊数据库