Note: Reliable low-vibration piezo-mechanical shutter.

Area of Science:

• Optics and Photonics
• Mechanical Engineering
• Materials Science

Background:

• Mechanical shutters are crucial for controlling light beams in various applications.
• Existing shutters often face limitations in durability, speed, and power handling.
• Piezo-actuators offer potential for compact and precise mechanical motion.

Purpose of the Study:

• To develop and characterize a novel mechanical shutter utilizing a bending piezo-actuator.
• To evaluate the shutter's performance in terms of extinction ratio, transmission loss, speed, and durability.
• To assess its suitability for high-power laser beam interruption and pulse generation.

Main Methods:

• Design and fabrication of a mechanical shutter incorporating a bending piezo-actuator.
• Characterization of the active aperture size (approx. 2 mm).
• Testing of optical performance including extinction and transmission.
• Evaluation of durability through extended cycling tests (20 x 10^6 cycles).
• Measurement of switching speeds (rise/fall times), delay, jitter, and long-term drift.
• Assessment of power handling capability (up to 2 W cw at 780 nm).

Main Results:

• The shutter achieves full extinction and lossless transmission.
• Exceptional durability demonstrated with over 20 million cycles without failure.
• Reliable interruption of continuous wave (cw) laser beams up to 2 W at 780 nm.
• Capable of generating pulses as short as 16 ms, with potential down to 1 ms.
• Fast rise and fall times of approximately 120 µs and a delay of 2 ms.
• Low jitter (< 10 µs) and minimal long-term drift (< 500 µs).

Conclusions:

• The piezo-actuator-based mechanical shutter offers a robust and high-performance solution for beam control.
• Its combination of speed, durability, and power handling makes it suitable for demanding optical applications.
• The device enables precise generation of short optical pulses with minimal timing variations.