Effect of the illumination profile on the spectral response of defect-limited etalons

Jesse Dean; Sophie Chagnon-Lessard; Ed Williams; Hubert Jean-Ruel

doi:10.1117/12.3009079

9 March 2024 Effect of the illumination profile on the spectral response of defect-limited etalons

Jesse Dean, Sophie Chagnon-Lessard, Ed Williams, Hubert Jean-Ruel

Proceedings Volume PC12882, Optical Components and Materials XXI; PC128820A (2024) https://doi.org/10.1117/12.3009079
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Fabry-Perot (FP) etalons play a central role in many industrial and research applications including spectroscopy. In the context of filters and frequency comb generators, they are typically illuminated with nominally collimated light with the intent of achieving a well-behaved, high-finesse spectral response. Few studies have analyzed the transmission profile of defect-limited fused silica FP etalons subjected to a range of illumination conditions. This paper presents such a comprehensive analysis, demonstrating quantitative agreement between theory, experiment, numerical analysis, and ray-tracing analysis. In particular, we predict and characterize the asymmetry and widening of the transmission peaks for the cases of small diameter gaussian beams at normal incidence and near-flat-top incoherent beams at non-normal incidence. Among other applications, we expect our work to support the development of high-performance frequency combs based on low-cost incoherent broadband sources for spectroscopy.

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Citation Download Citation

Jesse Dean, Sophie Chagnon-Lessard, Ed Williams, and Hubert Jean-Ruel "Effect of the illumination profile on the spectral response of defect-limited etalons", Proc. SPIE PC12882, Optical Components and Materials XXI, PC128820A (9 March 2024); https://doi.org/10.1117/12.3009079

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KEYWORDS

Fabry–Perot interferometers

Light sources and illumination

Spectral response

Frequency combs

Gaussian beams

Spectroscopy

Silica

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