Low-threshold microlaser in a high-Q asymmetrical microcavity.
We experimentally report an asymmetrical spherical microcavity with thermal-induced deformation, in which five-bounce whispering-gallery modes possess not only ultrahigh quality factors (Q) but also remarkably directional escape emission from the microsphere boundary. With efficient free-space excitation and collection, a low-threshold microlaser is demonstrated and exhibits a highly directional emission. Our measurement agrees well with the theoretical predictions by corrected Fresnel law.
Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China.
Y-F
YF
Xiao
C-H
CH
Dong
C-L
CL
Zou
Z-F
ZF
Han
L
L
Yang
G-C
GC
Guo