Feng, Z; Ding, M; Komanec, M; Zvánovec, S; Zhong, A; Poletti, F; Marra, G; Slavík, R (2025) Self-injection locked laser via a hollow-core fiber Fabry–Perot resonator. Photonics Research, 13 (3). pp. 611-617. ISSN 2327-9125

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Abstract

In a hollow-core fiber (HCF), light propagates through an air/vacuum core rather than a solid material, resulting in a low thermo-optic coefficient and ability to handle high powers. Here, we demonstrate a laser locked to a hollow-core fiber reference, which thanks to the low HCF thermal sensitivity, shows long-term stability an order of magnitude better than compact commercially available low-noise lasers. The laser frequency variation within ±600 kHz was measured over 50 h. The stability of our proof-of-concept laser is ensured via a strong self-injection ratio of −15 dB , enabled by the high-power handling and low loss of the hollow-core fiber’s resonator. Moreover, our results show appealing performance parameters, including a fractional frequency stability of 4×10 −13 at 1 s averaging time and a Lorentzian component of the linewidth of 0.2 Hz.

Item Type:	Article
Subjects:	Time and Frequency > Optical Frequency Standards and Metrology
Divisions:	Time & Frequency
Identification number/DOI:	10.1364/PRJ.530157
Last Modified:	04 Sep 2026 10:55
URI:	https://eprintspublications.npl.co.uk/id/eprint/10507