Blue-pumped whispering gallery optical parametric oscillator.
We demonstrate a whispering gallery optical parametric oscillator pumped at 488 nm wavelength. This millimeter-sized device has a pump threshold of 160 μW. The signal field is tunable between 707 and 865 nm wavelength and the idler field between 1120 and 1575 nm through temperature variation. Although the conversion efficiency is fundamentally limited to several percent because of absorption loss for the pump wave, the results provide evidence that such oscillators will be able to cover finally the entire visible range.
Laboratory for Optical Systems, Department of Microsystems Engineering—IMTEK, University of Freiburg, Georges-Köhler-Allee 102, Freiburg 79110, Germany.
Christoph Sebastian
CS
Werner
Tobias
T
Beckmann
Karsten
K
Buse
Ingo
I
Breunig