Parametric-amplification-induced nonreciprocal magnon laser.

Area of Science:

• Quantum Optics
• Condensed Matter Physics
• Optomagnonics

Background:

• Cavity optomagnonical systems couple magnons and photons.
• Magnon lasing is essential for quantum information processing.
• Nonreciprocity is key for device isolation and signal protection.

Purpose of the Study:

• To theoretically propose a scheme for all-optical nonreciprocal magnon lasing.
• To investigate the physical mechanism behind unidirectional magnon lasing.
• To explore the potential for high isolation rates in such systems.

Main Methods:

• Theoretical modeling of a composite cavity optomagnonical system.
• Utilizing a yttrium iron garnet sphere coupled to a parametric resonator.
• Employing unidirectional driving of a nonlinear resonator to induce asymmetric detuning.

Main Results:

• Achieved all-optical nonreciprocal magnon lasing action.
• Identified magnon-induced Brillouin scattering as the lasing mechanism.
• Demonstrated a potential isolation rate of 21 dB through parametric amplification adjustment.

Conclusions:

• The proposed scheme offers a pathway to all-optical nonreciprocal magnon lasers.
• This work provides a method for preparing coherent magnon lasers.
• The findings contribute to the development of protected laser technologies.