Abstract
We demonstrate fiber Fabry-Perot (FFP) cavities with concave mirrors that can be operated at cavity lengths as large as 1.5 mm without significant deterioration of the finesse. This is achieved by using a laser dot machining technique to shape spherical mirrors with ultralow roughness and employing single-mode fibers with large mode area for good mode matching to the cavity. Additionally, in contrast to previous FFPs, these cavities can be used over an octave-spanning frequency range with adequate coatings. We also show directly that shape deviations caused by the fiber's index profile lead to a finesse decrease as observed in earlier attempts to build long FFP cavities, and show a way to overcome this problem.
Highlights
IntroductionFiber Fabry-Perot (FFP) microcavities with CO2 laser-machined concave mirrors [1, 2] are being used in a fast-growing number of applications, ranging from cavity quantum electrodynamics with atomic, molecular and solid-state emitters [1, 3,4,5,6,7] and optomechanical systems [8] to Raman spectrometers for atmospheric gases [9] and new scanning microscopy techniques [10]
We demonstrate fiber Fabry-Perot (FFP) cavities with concave mirrors that can be operated at cavity lengths as large as 1.5 mm without significant deterioration of the finesse
Fiber Fabry-Perot (FFP) microcavities with CO2 laser-machined concave mirrors [1, 2] are being used in a fast-growing number of applications, ranging from cavity quantum electrodynamics with atomic, molecular and solid-state emitters [1, 3,4,5,6,7] and optomechanical systems [8] to Raman spectrometers for atmospheric gases [9] and new scanning microscopy techniques [10]
Summary
Fiber Fabry-Perot (FFP) microcavities with CO2 laser-machined concave mirrors [1, 2] are being used in a fast-growing number of applications, ranging from cavity quantum electrodynamics with atomic, molecular and solid-state emitters [1, 3,4,5,6,7] and optomechanical systems [8] to Raman spectrometers for atmospheric gases [9] and new scanning microscopy techniques [10] This range of applications could be further increased, and a gap in micro-optical technology could be filled, by increasing the optical length L of these cavities to the millimeter range while maintaining their crucial advantages such as built-in fiber coupling, small mode waist, high finesse and high passive stability. We find that the PC fiber improves the transmission by an order of magnitude for cavity lengths beyond 1 mm
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