Flat-top optical fibers as scramblers for EPRV measurements

Genevieve Markees; Stephen Eikenberry; Rodrigo Amezcua-Correa; Miguel Bandres; Sergio Leon-Saval; Jose Antonio-Lopez; Stephanos Yerolatsitis; Caleb Dobias

doi:10.1117/12.3019123

19 July 2024 Flat-top optical fibers as scramblers for EPRV measurements

Genevieve Markees, Stephen Eikenberry, Rodrigo Amezcua-Correa, Miguel Bandres, Sergio Leon-Saval, Jose Antonio-Lopez, Stephanos Yerolatsitis, Caleb Dobias

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 13096AF (2024) https://doi.org/10.1117/12.3019123
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Fiber mode scrambling remains a key technology for fiber-fed EPRV measurements. Any change in mode excitation within the fiber will result in apparent centroid shifts (and thus artificial RV shifts) in the target spectrum. Technologies such as scramblers and mechanical agitators are currently used to mitigate this effect. Here, we present our experimental results on the modal illumination stability of “flat top” optical fibers. These fibers are fabricated with deliberately-introduced internal mode scrambling features which distribute light evenly among the fiber modes during transmission from input to output. Importantly, this scrambling occurs with minimal (few percent) light losses and without external optical alignment or mechanical motion to achieve excellent mode scrambling if the flat-top fiber is spliced into the existing fiber feed. We will present our measurements of flat-top fiber throughput and scrambling gain, and the expected benefits from incorporating such a fiber into existing EPRV spectrographs.

Citation Download Citation

Genevieve Markees, Stephen Eikenberry, Rodrigo Amezcua-Correa, Miguel Bandres, Sergio Leon-Saval, Jose Antonio-Lopez, Stephanos Yerolatsitis, and Caleb Dobias "Flat-top optical fibers as scramblers for EPRV measurements", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 13096AF (19 July 2024); https://doi.org/10.1117/12.3019123

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