Optical Parametric Oscillation with Ultra-Low Power Threshold in a Dimer of Active-Passive Cavities

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.

Recent progress on coherent computation based on quantum squeezing

“…Optical parametric oscillation (OPO) describes the nonlinear optical process that converts a high-energy photon into two low-energy photons through χ (2) nonlinear crystals [60][61][62][63][64][65][66], as shown in Fig. 2a.…”

The anyonic recovery of parity-time symmetry in coupled circuits system

“…-As discussed in the previous part, it is believed that PT-symmetry in various physical systems has recently attracted interest for practical applications, e.g., sensing [30,31]. The sensitivity enhancement using the PT-symmetry usually exploits the characteristics of the system at the phase transition point, which is called the exceptional point [32][33][34]. The sensitivity enhancement of magnitude has been experimentally observed close to the transition point from the unbrokento the broken-PT regime for various landmarks.…”