Frequency locking of a 399-nm laser referenced to fluorescence spectrum of an ytterbium atomic beam  

作　　者：龙云 熊转贤 张曦 张梦娇 吕宝龙 贺凌翔 

机构地区：[1]Key Laboratory of Atomic Frequency Standards (KLAFS), Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China [2]University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Optics Letters》2014年第2期34-37,共4页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11274349,11204353,and 61227805);the National Key Basic Research and Development Program(973)of China(No.2011CB921503)

摘　　要：The laser cooling of ytterbium（Yb） atoms needs a 399-nm laser which operates on the strong1S0-1P1 transition and can be locked at the desired frequencies for different Yb isotopes.We demonstrate a frequency locking method using the fluorescence spectrum of an Yb atomic beam as a frequency reference.For unresolved fluorescence peaks,we make the spectrum of the even isotopes vanish by using the strong angular-dependence of the fluorescence radiations;the remained closely-spaced peaks are thus clearly resolved and able to serve as accurate frequency references.A computer-controlled servo system is used to lock the laser frequency to a single fluorescence peak of interest,and a frequency stability of 304 kHz is achieved.This frequency-locked laser enables us to realize stable blue magneto-optic-traps（MOT） for all abundant Yb isotopes.The laser cooling of ytterbium（Yb） atoms needs a 399-nm laser which operates on the strong1S0-1P1 transition and can be locked at the desired frequencies for different Yb isotopes.We demonstrate a frequency locking method using the fluorescence spectrum of an Yb atomic beam as a frequency reference.For unresolved fluorescence peaks,we make the spectrum of the even isotopes vanish by using the strong angular-dependence of the fluorescence radiations;the remained closely-spaced peaks are thus clearly resolved and able to serve as accurate frequency references.A computer-controlled servo system is used to lock the laser frequency to a single fluorescence peak of interest,and a frequency stability of 304 kHz is achieved.This frequency-locked laser enables us to realize stable blue magneto-optic-traps（MOT） for all abundant Yb isotopes.

关 键 词：Atom lasers Atomic beams FLUORESCENCE ISOTOPES Locks (fasteners) 

分 类 号：TN248[电子电信—物理电子学]