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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

Published on: February 4, 2018

Acousto-optic tunable filter using double interaction for sidelobe reduction.

Jean-Claude Kastelik¹, Hichem Benaissa, Samuel Dupont

¹IEMN CNRS 8520, Opto-Acousto-Electronic Department, University of Valenciennes,Le Mont Houy, 59313 Valenciennes Cedex 9, France. kastelik@univ-valenciennes.fr

|March 3, 2009

Summary

This study introduces a bifrequency acousto-optic tunable filter (AOTF) that significantly reduces sidelobes for polychromatic laser applications. The novel design enhances wavelength filtration accuracy in optical systems.

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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

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Published on: August 21, 2018

Area of Science:

Optics and Photonics
Acousto-Optics

Background:

Polychromatic laser beams require precise wavelength filtration for various applications.
Existing acousto-optic tunable filters (AOTFs) can exhibit significant sidelobes, impacting spectral purity.

Purpose of the Study:

To develop and characterize a novel bifrequency acousto-optic tunable filter (AOTF) for improved polychromatic laser beam manipulation.
To reduce sidelobe levels in the optical wavelength impulse response of the AOTF.

Main Methods:

The bifrequency AOTF utilizes two successive anisotropic interactions in paratellurite with specific acoustic shear wave configurations.
Theoretical expressions for operating frequencies, spectral bandwidths, and acoustic powers were derived.
Numerical computations were performed for paratellurite, and experimental validation was conducted using an argon laser.

Main Results:

The proposed bifrequency AOTF design significantly reduces sidelobes in the impulse response to optical wavelengths.
Theoretical predictions regarding operating frequencies, bandwidths, and acoustic powers were established.
Experimental results using a multiline argon laser beam confirmed the theoretical models and demonstrated effective wavelength filtration.

Conclusions:

The bifrequency AOTF offers enhanced performance for filtering polychromatic laser beams by minimizing sidelobe interference.
The device provides a robust solution for applications demanding high spectral resolution and accuracy.
The study validates the theoretical framework and experimental efficacy of the novel AOTF design.