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Piezo bender controller for precise optical dispersion compensation based on single-shot optical interferometry.

Ching-Lun Xiao1, Jui-Chi Chang1, Shao-Wei Haung1

  • 1Department of Mechanical Engineering, National Cheng Kung University, Tainan 70101, Taiwan.

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Summary
This summary is machine-generated.

This study developed a piezo bender pulse compressor to counteract ultrafast laser dispersion. A novel interferometer system stabilizes the compressor, achieving a 12-fold reduction in laser pulse width.

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Area of Science:

  • Nonlinear Optics
  • Femtosecond Lasers
  • Optical Engineering

Background:

  • Ultrafast lasers generate high peak power through short pulses (femtoseconds).
  • Optical dispersion in applications broadens laser pulses, reducing peak power and hindering nonlinear optical phenomena.
  • Existing piezo bender-based pulse compressors face challenges with hysteresis and creep, leading to degraded performance.

Purpose of the Study:

  • To develop a piezo bender-based pulse compressor for dispersion compensation in ultrafast lasers.
  • To address the instability issues of piezo benders caused by hysteresis and creep.
  • To improve the effectiveness and reliability of laser pulse compression techniques.

Main Methods:

  • Development of a piezo bender-based pulse compressor.
  • Implementation of a single-shot modified laterally sampled laser interferometer for shape estimation.
  • Utilizing a closed-loop controller with feedback from the interferometer to maintain the piezo bender's desired parabolic shape.
  • Characterization of group delay dispersion and pulse width before and after compression.

Main Results:

  • The developed system effectively compensates for optical dispersion, restoring laser pulse width.
  • The closed-loop control system successfully mitigated piezo bender instability.
  • Achieved a significant reduction in laser pulse width from 1620 fs to 140 fs (a 12-fold improvement).
  • The steady-state error in group delay dispersion was measured to be approximately 530 fs².

Conclusions:

  • The proposed piezo bender pulse compressor with interferometer-based feedback offers a robust solution for ultrafast laser dispersion management.
  • This technique significantly enhances laser pulse compression, enabling more efficient utilization of nonlinear optical phenomena.
  • The system demonstrates high effectiveness in restoring ultrashort laser pulse characteristics for advanced applications.