A Test Resonator for Kagome Hollow-Core Photonic Crystal Fibers for Resonant Rotation Sensing

TL;DR

This paper demonstrates the construction of ring resonators using Kagome Hollow-Core Photonic Crystal Fibers, showing their potential for high-performance resonant rotation sensing with improved finesse and contrast over previous fiber types.

Contribution

It introduces a novel resonator design with Kagome fibers, achieving higher finesse and contrast, and discusses advantages for rotation sensing applications.

Findings

Achieved finesse of about 30 with Kagome fibers.

Resonance linewidths of 3.2 MHz and contrast up to 89%.

Better performance compared to 7-cell PBG fibers.

Abstract

We build ring resonators to assess the potentialities of Kagome Hollow-Core Photonic Crystal Fibers for future applications to resonant rotation sensing. The large mode diameter of Kagome fibers permits to reduce the free space fiber-to-fiber coupling losses, leading to cavities with finesses of about 30 for a diameter equal to 15 cm. Resonance linewidths of 3.2~MHz with contrasts as large as 89\% are obtained. Comparison with 7-cell photonic band gap (PBG) fiber leads to better finesse and contrast with Kagome fiber. Resonators based on such fibers are compatible with the angular random walk required for medium to high performance rotation sensing. The small amount of light propagating in silica should also permit to further reduce the Kerr-induced non-reciprocity by at least three orders of magnitudes in 7-cell Kagome fiber compared with 7-cell PBG fiber.