Resonance-free Fabry-Pérot cavity via unrestricted orbital-angular-momentum ladder-up

Shaghayegh Yaraghi, Oussama Mhibik, Murat Yessenov, J. Keith Miller, Midya Parto, Eric G. Johnson, Ayman F. Abouraddy and Ivan Divliansky ()
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Shaghayegh Yaraghi: University of Central Florida, CREOL, The College of Optics & Photonics
Oussama Mhibik: University of Central Florida, CREOL, The College of Optics & Photonics
Murat Yessenov: University of Central Florida, CREOL, The College of Optics & Photonics
J. Keith Miller: University of Central Florida, CREOL, The College of Optics & Photonics
Midya Parto: University of Central Florida, CREOL, The College of Optics & Photonics
Eric G. Johnson: University of Central Florida, CREOL, The College of Optics & Photonics
Ayman F. Abouraddy: University of Central Florida, CREOL, The College of Optics & Photonics
Ivan Divliansky: University of Central Florida, CREOL, The College of Optics & Photonics

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract Introducing elements into an optical cavity that modify the transverse spatial field structure can also impact the cavity spectral response. In particular, an intra-cavity spatial mode-converter is expected to induce modal runaway: unrestricted ladder-up in the modal order, concomitantly thwarting coherent field interference, thereby altogether suppressing the resonant response – a phenomenon that has yet to be observed in an optical cavity. Here we show that a single intra-cavity holographic phase mask placed in a compact free-standing planar Fabry-Pérot cavity renders the cavity spectral response resonance-free. By acting as a mode-converter on a basis of Laguerre-Gaussian (LG) modes, an incident broadband fundamental Gaussian mode exits the cavity in the form of a superposition of a large number of collinearly propagating broadband LG modes of fixed parity whose spectra coincide with that of the input. Crucially, the resonance-free spectral response is maintained while changing the cavity length by ~ 350%, raising the prospect of stable resonant optical sensors whose performance is impervious to length perturbations.

Date: 2025
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DOI: 10.1038/s41467-025-65348-0

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