Abstract & Article Details
Research Article • Vol.6, Issue 3 • ISSN: 2766-2276 • Open Access • CC BY 4.0
Heterodyne Light Source Using Two Tandem Acousto Optic Modulators under Bragg Diffraction Conditions
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%.
Research Topics
How to Cite
Article Information
| Journal | Journal of Biomedical Research & Environmental Sciences (JBRES) |
|---|---|
| ISSN | 2766-2276 |
| DOI | DOI 10.37871/jbres2076 |
| Volume / Issue | Vol. 6, Issue 3 |
| Received | February 18, 2025 |
| Accepted | March 6, 2025 |
| Published | March 8, 2025 |
| Article Type | Research Article |
| Pages | 221-225 |
| License | CC BY 4.0 — Open Access |
| Publisher | SciRes Literature LLC, Sheridan, WY, USA |
| Language | English |
Published under CC BY 4.0 — free to share, copy, adapt, and redistribute with attribution.
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