机译:Ce:BaTiO3中黑暗中光折射光栅的衍射效率长期增加的异常行为
Centre;
for;
Optical;
and;
Electromagnetic;
Research;
State;
Key;
Laboratory;
of;
Modern;
instrumentation;
Zhejiang;
Provincial;
Lab;
University;
Hangzhou;
310027;
China;
Optic;
Fiber;
Communication;
Technology;
310032;