Amplifying optical spring effect in an optical cavity with an optical parametric amplifier.

Area of Science:

• Optics
• Quantum Optics
• Optomechanics

Background:

• The optical spring (OS) effect describes how light pressure can alter mechanical resonator frequencies.
• Controlling the OS effect is crucial for precision measurements, particularly in gravitational wave detection.

Purpose of the Study:

• To investigate the manipulation of the optical spring effect by integrating an optical parametric amplifier (OPA) into an optical cavity.
• To explore the impact of OPA phase tuning on cavity resonance profiles and optomechanical properties.

Main Methods:

• Integration of an optical parametric amplifier (OPA) into an optical cavity.
• Measurement of OPA cavity resonance profiles across amplification and de-amplification modes.
• Analysis of changes in effective cavity linewidth, OS frequency shift, and optomechanical damping.

Main Results:

• Tuning the OPA phase to amplification mode resulted in significant changes to cavity resonance.
• Observed a twofold increase in the optical spring (OS) frequency shift.
• Demonstrated a fourfold enhancement in optomechanical damping under OPA amplification.

Conclusions:

• The integration of OPA provides a powerful method for manipulating the optical spring effect.
• This technique offers potential enhancements for gravitational wave detectors, particularly in detuned signal recycling configurations.
• The tunable OS frequency can be optimized for detecting continuous gravitational waves and tracking dynamic astrophysical events.