Projects per year
Abstract
Sensing and filtering applications often require Fabry-Perot (FP) etalons with an Interferometer Transfer Function (ITF) having high visibility, narrow Full Width at Half Maximum (FWHM), and high sensitivity. For the ITF to have these characteristics, the illumination beam must be matched to the modes of the FP cavity. This is challenging when a small illumination element size is needed, as typical focused beams are not matched to the FP cavity modes. Bessel beams are a potential alternative as their structure resembles the FP cavity modes while possessing a focused core. To study the feasibility of using Bessel beam illumination, in this Letter, ITFs of an FP etalon were measured using Bessel and Gaussian illumination beams. A Bessel beam with core size of 28 µm provided an ITF with visibility 3.0 times higher, a FWHM 0.3 times narrower, and a sensitivity 2.2 times higher than a Gaussian beam with waist 32 µm. The results show that Bessel beam illumination can provide ITFs similar to that of collimated beam illumination while also having with a focused core.
Original language | English |
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Pages (from-to) | 6352-6355 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 48 |
Issue number | 24 |
Early online date | 1 Dec 2023 |
DOIs | |
Publication status | Published - 15 Dec 2023 |
Bibliographical note
Funding.British Heart Foundation (AA/18/2/34218); Engineering and Physical Sciences Research Council (EP/L015455/1); Royal Society (URF\R\191036, URF\R1\180435).
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Dive into the research topics of 'Increasing the Q-factor of Fabry-Perot etalons using focused Bessel beam illumination'. Together they form a unique fingerprint.Projects
- 1 Finished
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Wavefront shaping for next-generation biomedical photoacoustic imaging
Guggenheim, J. (Principal Investigator)
1/01/21 → 30/10/23
Project: Research Councils