Research On Nonlinear Cascading Effect And Quantum Mechanical Simulation

Cascading processes have extensive applications in optics which benefits a lot from their enhancement ability and versatile configuration as compared with direct ones.The two key features of the cascading process are the existence of nonlinear phase shifts and optical solitons.This has wide applications in three-wave mixing,spatial non-reciprocity,pulse compression,optical bistability,all-optical switching and wavelength division multiplexing systems.Quasi-phase matched sum-frequency generation(SFG)and electrooptic(EO)polarization coupling has been realized simultaneously in a periodically poled lithium niobate on insulator(PPLNOI)ridge waveguide.Therefore,utilizing the cascading process,the intensity of sum-frequency conversion can be modulated by applying a transverse electric field.Both the driving voltage and input power is low due to the enhancement on the LNOI platform.The scheme solves the problem of low efficiency in the process of cascading on the bulk medium.On the one hand,our experimental scheme is highly integrated,responsive and efficient.On the other hand,the working wavelength of cascading SFG and EO polarization coupling cascade project can be flexibly tuned by polarization period and temperature.The scheme may find applications in nonlinear optical processing and communication.The optical cascading coupling process is similar to energy level transition in quantum system.We propose utilizing the classical optical process to simulate the atomic system in quantum mechanics.The Rabi oscillation in two-level system is simulated by the EO polarization coupling.The dark state in the three-level system is simulated by cascading of SFG and EO polarization coupling.It provides a feasible experimental method for the study of quantum mechanics.