Complete and robust energy conversion by sum frequency generation based on Invariant Engineering

TL;DR

This paper introduces an invariant engineering approach to achieve near-perfect energy conversion in sum frequency generation, offering robustness against perturbations and broad spectral bandwidth, surpassing conventional methods.

Contribution

It presents a novel analytical method based on Lewis-Riesenfeld invariants for complete and robust sum frequency generation, with optimized crystal design for high efficiency.

Findings

Achieves nearly 100% conversion efficiency at any crystal length.

Demonstrates robustness against coupling and phase mismatch perturbations.

Provides broad spectral bandwidth of over 400 nm.

Abstract

We propose an analytical method to achieve complete energy conversion in sum frequency generation based on Lewis-Riesenfeld invariants theory. This technique, derived from a two-level atom transition in quantum mechanics, is more efficient and robust than conventional methods. In our scheme, the quasi-adiabatic single control parameter model is established, and the value of single control parameter is selected to make the initial eigenstate perfectly converted to the final eigenstate we need. Corresponds to the nonlinear frequency conversion process, the nonlinear crystal structure is designed with the inverse engineering of optimal control theory, which is robust against the perturbations in the coupling coefficient and phase mismatch, including pump intensity and crystal polarization period variations, and results in almost 100% conversion efficiency at any crystal length. It is demonstrated that the frequency conversion can be achieved in the wavelength range of 2.6 {\mu}m -3.6 {\mu}m with a spectral bandwidth of the conversion efficiency over 50% approaching to 400 nm when the crystal length L=1 mm.