Key;
Laboratory/or;
Physical;
Electronics;
and;
Devices;
of;
the;
Ministry;
of;
Education,;
Xi'an;
Jiaotong;
University,;
Xi'an;
710049;
Department;
of;
Physics,;
University;
of;
Arkansas,;
Fayetteville,;
Arkansas;
72701,;
USA;
State;
Key;
Laboratory;
of;
Transient;
Optics;
and;
Technology,;
Xi'an;
Institute;
of;
Optics;
and;
Precision;
Mechanics,;
Chinese;
Academy;
of;
Sciences,;
Xi'an;
710068;