A simple and robust multiple wavelength frequency stabilization system is demonstrated using a single transfer cavity and a1062-nm ultra-stable laser for all the lasers used in a mercury optical lattice clock.Offset s...A simple and robust multiple wavelength frequency stabilization system is demonstrated using a single transfer cavity and a1062-nm ultra-stable laser for all the lasers used in a mercury optical lattice clock.Offset sideband locking is employed to tune the laser frequency while dichroic mirrors and differentiated modulation frequencies are utilized for the Pound–Drever–Hall locking of four-color lasers.For the most demanding lasers at 1015 nm and 725 nm,the line width of the beat note is reduced to 27 kHz and 17 kHz,respectively.The frequency fluctuation for the transfer-locked 1015-nm laser is less than 10 kHz,which is much better than the lasers locked to an atomic spectrum.Using its high stability of 5×10^(-12)over100 s,the transfer-locked 1015-nm laser is employed for low-noise frequency modulated saturated absorption spectroscopy.This approach could also be used in various situations for the research of optical clocks,Rydberg atoms,laser cooling of molecules,and quantum computation with neutral atoms.展开更多
A cold atom source is important for quantum metrology and precision measurement.To reduce the quantum projection noise limit in optical lattice clock,one can increase the number of cold atoms and reduce the dead time ...A cold atom source is important for quantum metrology and precision measurement.To reduce the quantum projection noise limit in optical lattice clock,one can increase the number of cold atoms and reduce the dead time by enhancing the loading rate.In this work,we realize an enhanced cold mercury atom source based on a two-dimensional(2D)magnetooptical trap(MOT).The vacuum system is composed of two titanium chambers connected with a differential pumping tube.Two stable cooling laser systems are adopted for the 2D-MOT and the three-dimensional(3D)-MOT,respectively.Using an optimized 2D-MOT and push beam,about 1.3×10^(6)atoms,which are almost an order of magnitude higher than using a pure 3D-MOT,are loaded into the 3D-MOT for202Hg atoms.This enhanced cold mercury atom source is helpful in increasing the frequency stability of a neutral mercury lattice clock.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11874371,91436105,and 12104474)the Shanghai Science and Technology Program,China(No.22ZR1471000)the Strategic Pilot Science and Technology Project of the Chinese Academy of Sciences,China(No.XDB21030200)。
文摘A simple and robust multiple wavelength frequency stabilization system is demonstrated using a single transfer cavity and a1062-nm ultra-stable laser for all the lasers used in a mercury optical lattice clock.Offset sideband locking is employed to tune the laser frequency while dichroic mirrors and differentiated modulation frequencies are utilized for the Pound–Drever–Hall locking of four-color lasers.For the most demanding lasers at 1015 nm and 725 nm,the line width of the beat note is reduced to 27 kHz and 17 kHz,respectively.The frequency fluctuation for the transfer-locked 1015-nm laser is less than 10 kHz,which is much better than the lasers locked to an atomic spectrum.Using its high stability of 5×10^(-12)over100 s,the transfer-locked 1015-nm laser is employed for low-noise frequency modulated saturated absorption spectroscopy.This approach could also be used in various situations for the research of optical clocks,Rydberg atoms,laser cooling of molecules,and quantum computation with neutral atoms.
文摘A cold atom source is important for quantum metrology and precision measurement.To reduce the quantum projection noise limit in optical lattice clock,one can increase the number of cold atoms and reduce the dead time by enhancing the loading rate.In this work,we realize an enhanced cold mercury atom source based on a two-dimensional(2D)magnetooptical trap(MOT).The vacuum system is composed of two titanium chambers connected with a differential pumping tube.Two stable cooling laser systems are adopted for the 2D-MOT and the three-dimensional(3D)-MOT,respectively.Using an optimized 2D-MOT and push beam,about 1.3×10^(6)atoms,which are almost an order of magnitude higher than using a pure 3D-MOT,are loaded into the 3D-MOT for202Hg atoms.This enhanced cold mercury atom source is helpful in increasing the frequency stability of a neutral mercury lattice clock.
