报道一种新颖的波长可调谐光纤光栅外腔分布布拉格反射激光器。
A novel tunable distributed Bragg reflection (DBR) laser using metal coated fiber Bragg grating as the external cavity was demonstrated.
在所有的激光器中，光都在一个反射腔中重复反射。
In all lasers, light is repeatedly reflected within a mirrored cavity.
根据多普勒效应，光被离子反射后，靠近激光器的光的频率会高于远离激光器的光的频率，（日常生活中，救护车警报器的音调随着车的远近也变化，就是这个道理）这才有可能测量先前对离子施加的力的大小。
(An everyday example of this effect is the change of pitch of an ambulance siren as it approaches and recedes.) It was thus possible to measure the force applied to the ions.
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