Abstract
Optical parametric oscillation can convert the input laser into a couple of coherent optical output with signal and idler frequencies. It is an important method for the realization of the broadband middle infrared tunable lasers. The optical parametric oscillation process depends on the ultra-fast non-linear response of matter to light with a certain pump power. Therefore, reducing the pump threshold of the optical parametric oscillation process and improving the energy conversion efficiency are of great significance to the study of non-linear optics. In this paper, we construct a dimer system that couples a passive non-linear resonator to an active resonator. Based on the dimer system, an ultra-low threshold optical parametric oscillation generation method is proposed. By coupling the gain pump mode, the non-linear effect is effectively enhanced, the pump power threshold is reduced to half of when there is no gain, and the energy conversion efficiency is increased. We believe this research provides a feasible method for a low-threshold tunable and easy-to-integrate optical parametric oscillation laser source.
Highlights
The optical parametric oscillator converts the input pump laser light into two output lights with lower frequency through the secondorder nonlinear optical interaction
optical parametric oscillations (OPO) thresholds have been observed in bulk lithium niobate whispering gallery resonators with 6 μW [15], milliwatt-level OPOs thresholds have been observed in the planar periodically polarized Ti:LiNbO3 waveguide [16]
We intend to propose a novel platform based on the whispering gallery mode (WGM) optical microcavities to show the better performance of OPOs
Summary
The optical parametric oscillator converts the input pump laser light into two output lights with lower frequency (usually called signal light and idler light) through the secondorder nonlinear optical interaction. Relying on the specific optical device with low optical loss and field enhancement, such as the optical microcavities, the threshold of the optical non-linear effects could be improved [19,20]. During the past few decades, various studies have been made based on WGM microcavities in the field of non-linear effects, such as the second harmonics [24,25,26], the OPOs [15,27], the photon blockade [28,29,30], and optical frequency combs [31,32]. In the field of non-linear optics, the low optical loss may significantly enhance the non-linear effect and improve the performances of high-order sideband generation [41] and the second harmonic generation [42]. Our research has greatly improved the non-linear conversion efficiency
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