Naturally phase-matched second-harmonic generation in a whispering-gallery-mode resonator.
We demonstrate for the first time natural phase matching for optical frequency doubling in a high-Q whispering-gallery-mode resonator made of lithium niobate. A conversion efficiency of 9% is achieved at 30 microW in-coupled continuous wave pump power. The observed saturation pump power of 3.2 mW is almost 2 orders of magnitude lower than the state-of-the-art value. This suggests an application of our frequency doubler as a source of nonclassical light requiring only a low-power pump, which easily can be quantum noise limited. Our theoretical analysis of the three-wave mixing in a whispering-gallery-mode resonator provides the relative conversion efficiencies for frequency doubling in various modes.
Fürst
J U
JU
Max Planck Institute for the Science of Light, Erlangen, Germany.
Strekalov
D V
DV
Elser
D
D
Lassen
M
M
Andersen
U L
UL
Marquardt
C
C
Leuchs
G
G