Note: A high-performance, low-cost laser shutter using a piezoelectric cantilever actuator.

Area of Science:

• Optics and Photonics
• Materials Science
• Mechanical Engineering

Background:

• Conventional electro-magnetic shutters present limitations in power consumption and acoustic noise.
• Precise control over optical switching is crucial for various scientific applications.

Purpose of the Study:

• To design and characterize a novel optical shutter utilizing a piezoelectric cantilever.
• To evaluate the performance, including speed, noise, and reliability, of the piezoelectric shutter.
• To compare its advantages over traditional electro-magnetic shutters.

Main Methods:

• Fabrication of an optical shutter based on a piezoelectric cantilever.
• Implementation of a high-voltage op-amp circuit for precise control of cantilever movement.
• Characterization of shuttering rise/fall times, mechanical slew rates, and timing jitter.
• Assessment of device reliability through continuous operation testing.

Main Results:

• The piezoelectric shutter exhibits intrinsically low power consumption and acoustic quietness.
• Achieved shuttering rise and fall times of 11 μs with minimal timing jitter (< 1 μs).
• Demonstrated a factor of 30 reduction in mechanical noise compared to rapidly switched devices.
• Confirmed reliability with no measurable change in delay or actuation speed after one week of continuous operation.

Conclusions:

• The piezoelectric cantilever optical shutter offers a superior alternative to electro-magnetic shutters due to its low power, quiet operation, and high speed.
• The developed control circuitry allows for fine-tuning of mechanical parameters, reducing noise.
• The device shows excellent reliability and potential for generating short optical pulses (minimum 250 μs).