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Resonance-free Fabry-Pérot cavity via unrestricted orbital-angular-momentum ladder-up
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Resonance-free Fabry-Pérot cavity via unrestricted orbital-angular-momentum ladder-up
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Journal Article
Resonance-free Fabry-Pérot cavity via unrestricted orbital-angular-momentum ladder-up
2025
Overview
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.
Researchers demonstrate a resonance-free Fabry-Perot cavity using a single holographic phase mask. By converting Gaussian input into a broadband mix of Laguerre-Gaussian modes, the cavity remains stable despite ~350% length changes, paving the way for highly reliable optical sensors.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
