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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Dynamic optical sampling by cavity tuning and its application in lidar.

Lin Yang¹, Jinsong Nie, Lingze Duan

¹Department of Physics, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA.

|March 14, 2013

Summary

A new dynamic model for optical sampling by cavity tuning (OSCAT) accurately predicts performance under high scan rates. This advancement enables precise remote motion tracking over long distances using a femtosecond laser system.

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Area of Science:

Optics and Photonics
Laser Technology
Measurement Science

Background:

Optical sampling by cavity tuning (OSCAT) offers a cost-effective method for fast tunable optical delay using femtosecond lasers.
Previous static models were insufficient for describing OSCAT performance under dynamic conditions like high scan rates and interferometer imbalance.

Purpose of the Study:

To develop and validate a dynamic model for OSCAT that accounts for continuous modulation of laser repetition rates.
To enable accurate evaluation of delay scan depth under challenging experimental conditions.
To demonstrate the capability of fast OSCAT for remote motion tracking applications.

Main Methods:

Development of a dynamic model for OSCAT incorporating continuous laser repetition rate modulation.
Experimental validation of the dynamic model under high interferometer imbalance and high scan rates.
Demonstration of remote motion tracking using the fast OSCAT system.

Main Results:

The dynamic OSCAT model accurately describes performance beyond the limitations of static models.
Successfully detected target vibrations as small as 15 µm peak-to-peak at frequencies up to 50 Hz.
Achieved remote motion tracking at an equivalent free-space distance exceeding 2 km.

Conclusions:

The dynamic OSCAT model provides a more comprehensive understanding of the system's capabilities.
Fast OSCAT is a viable technology for high-precision, long-distance remote motion tracking.
This work expands the applicability of femtosecond laser-based optical delay systems.