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Heterodyne Light Source Using Two Tandem Acousto Optic Modulators under Bragg Diffraction Conditions

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Open Access
Article Type Research Article
Subject General Science
OCLC JBRES Record
Ming-Hung Chiu* and Chao-Ching Chiu
Issue: Volume6-Issue3
Pages: 221-225
Received: 2025-02-18
Accepted: 2025-03-06
Published: 2025-03-08

Abstract

We propose a novel heterodyne light source architecture employing two tandem Acousto-Optic Modulators (AOM) operating under Bragg-diffraction conditions. A mirror and a half-wave plate are strategically positioned between the AOMs. By fine-tuning the angle of the mirror relative to the AOMs, only the +1st- or −1st-order light is generated, allowing the two light beams to coincide. The beat frequency is determined by the difference in modulation frequencies. In order to demonstrate the feasibility of this architecture, we use this light source in Common-Path Heterodyne Interferometry (CPHI) to measure the gold film thickness of a Surface Plasmon Resonance (SPR) sensor. The experimental results are in good agreement with the outcomes of mathematical simulations. In addition, the heterodyne light source has two linear polarizations perpendicular to each other with a frequency difference of 10 kHz, and the utilization rate of the light source can reach 90%.

FullText HTML FullText PDF DOI: 10.37871/jbres2076 Crossmark

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Copyright

© 2025 Ming-Hung C, et al. Distributed under Creative Commons CC-BY 4.0 Creative CommonsAttribution

How to cite this article

Ming-Hung C, Chao-Ching C. Heterodyne Light Source Using Two Tandem Acousto-Optic Modulators under Bragg Diffraction Conditions. J Biomed Res Environ Sci. 2025 Mar 08; 6(2): 221-225. doi: 10.37871/ jbres2076, Article ID: JBRES2076, Available at: https://www.jelsciences.com/articles/jbres2076.pdf

Subject area(s)

PhysicsMaterial Science

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