4l-PBD: a probe beam deflection system with quadruple coupling length for acoustic detection

Area of Science:

• Acousto-optic physics
• Optical sensing technologies
• Signal processing

Background:

• Acoustic detection systems often face limitations in sensitivity for weak signals.
• Light probe beam deflection is a valuable technique for non-contact measurements.
• Enhancing acousto-optic coupling is crucial for signal amplification.

Purpose of the Study:

• To present a quadruple acousto-optic coupling length-enhanced acoustic detection system (4l-PBD).
• To improve the sensitivity and precision of acoustic pressure measurements.
• To offer a high-sensitivity non-contact detection solution.

Main Methods:

• Utilizing light probe beam deflection methodology.
• Implementing polarization multiplexing.
• Leveraging non-reciprocal characteristics of Faraday rotator mirrors to quadruple effective acousto-optic coupling length.

Main Results:

• Numerical simulations confirmed the architecture's effectiveness.
• Experimental validations demonstrated the amplified angular deflection of probe beams.
• The 4l-PBD system showed significant potential for precise weak signal detection.

Conclusions:

• The 4l-PBD system effectively quadruples acousto-optic coupling length.
• This architecture provides a promising approach for high-sensitivity, non-contact acoustic detection.
• The findings pave the way for advanced acoustic sensing applications.