Alter UK offers a range of highly integrated, miniaturized and robust narrow-linewidth lasers for quantum applications. One such example is the compact Flame laser module. The Flame presents an internal saturation absorption spectroscopy (SAS) arm consisting of a rubidium vapor cell which the laser can subsequently be locked to, reducing the need for external optical components. The following work focuses on how we characterize the Flame in terms of frequency stability, by use of a three-cornered hat experimental setup. Additionally, the laser locked to its internal SAS is compared to an external setup.
Fiber laser sources from visible to near-infrared wavelengths have driven innovative developments, impacting various domains such as telecommunications, biology, and medicine. The development of such fiber laser relies on the accurate knowledge of both optical properties as chromatic dispersion and material properties. On the other hand, quantum metrology is one of the promising field enabled by quantum technologies. It allows to get precise results compare to classical methods when measuring physical properties. A very common approach is to inject non classical states of light in interferometers to increase accuracy as well as sensitivity. Recently, this scheme has been used for detecting gravitational waves for example [1].
During the conference, we show how we take advantage of these capabilities to gather optical fiber photonic engineering with quantum optics. More specifically, we aim at presenting two quantum-based method for (i) high-accuracy (10-5) and dispersion-free measurement of refractive index difference and (ii) chromatic dispersion measurement based on the concept of quantum white-light interferometry that allows absolute measurement of chromatic dispersion with ~2.5 times improved accuracies compared to state-of-the-art realizations at telecom wavelengths.
[1] B. P. Abbott et. al., ”Observation of Gravitational Waves from a Binary Black Hole Merger”, Phys. Rev. Lett., 116, 061102 (2016)
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