Ultrafast optical gating in a nonlinear lithium niobate microcavity

Area of Science:

• Photonics and Quantum Optics
• Nonlinear Optics
• Materials Science

Background:

• High-finesse optical cavities are crucial for light-matter interactions, photonic band structures, and quantum information storage.
• Slow optical readout and limited transient control hinder the full potential of these cavities.

Purpose of the Study:

• To demonstrate an ultrafast intracavity optical gating scheme for high-finesse nonlinear microcavities.
• To enable rapid readout and real-time control of optical fields within microcavities.

Main Methods:

• Utilized femtosecond optical gate pulses in lithium niobate microcavities.
• Employed sum-frequency generation for instantaneous upconversion of intracavity fields.
• Applied difference-frequency generation to instantiate cavity fields.

Main Results:

• Successfully demonstrated an ultrafast gating scheme enabling prompt extraction of intracavity field information.
• Validated the approach by tracking resonant mode dynamics, showing good agreement with analytical models.
• Showcased efficient instantiation of cavity fields using difference-frequency generation.

Conclusions:

• The developed gating scheme overcomes limitations of slow readout in high-finesse cavities.
• This technique provides space- and time-resolved information on intracavity fields.
• Enables future real-time control of light-matter interactions and quantum-optical states.