We report on the optical characterization of a compact bow-tie cavity composed of two flat mirrors and two concave mirrors, all having a reflectance > 99.99% in the spectral range between 4.8 μm and 5.3 μm, mounted in a stainless-steel enclosure. The cavity was designed for the implementation of an intracavity-quartz enhanced photoacoustic sensor system. The propagation parameters of the intra-cavity beam were determined using the ABCD-matrix method, allowing the analytical formulation of the size of two beam waists occurring inside the cavity. A collimated mid-infrared laser beam was optically coupled and mode matched into the bow-tie cavity via a focusing lens. A cavity finesse of ∼ 2000 was measured at a pressure of 90 Torr inside the cavity, corresponding to an optical power enhancement factor of ∼ 320.

Mode matching of a laser-beam to a compact high finesse bow-tie optical cavity for quartz enhanced photoacoustic gas sensing / Patimisco, Pietro; Sampaolo, Angelo; Tittel, Frank K.; Spagnolo, Vincenzo Luigi. - In: SENSORS AND ACTUATORS. A, PHYSICAL. - ISSN 0924-4247. - 267:(2017), pp. 70-75. [10.1016/j.sna.2017.10.005]

Mode matching of a laser-beam to a compact high finesse bow-tie optical cavity for quartz enhanced photoacoustic gas sensing

Patimisco, Pietro;Sampaolo, Angelo;Spagnolo, Vincenzo Luigi
2017-01-01

Abstract

We report on the optical characterization of a compact bow-tie cavity composed of two flat mirrors and two concave mirrors, all having a reflectance > 99.99% in the spectral range between 4.8 μm and 5.3 μm, mounted in a stainless-steel enclosure. The cavity was designed for the implementation of an intracavity-quartz enhanced photoacoustic sensor system. The propagation parameters of the intra-cavity beam were determined using the ABCD-matrix method, allowing the analytical formulation of the size of two beam waists occurring inside the cavity. A collimated mid-infrared laser beam was optically coupled and mode matched into the bow-tie cavity via a focusing lens. A cavity finesse of ∼ 2000 was measured at a pressure of 90 Torr inside the cavity, corresponding to an optical power enhancement factor of ∼ 320.
2017
Mode matching of a laser-beam to a compact high finesse bow-tie optical cavity for quartz enhanced photoacoustic gas sensing / Patimisco, Pietro; Sampaolo, Angelo; Tittel, Frank K.; Spagnolo, Vincenzo Luigi. - In: SENSORS AND ACTUATORS. A, PHYSICAL. - ISSN 0924-4247. - 267:(2017), pp. 70-75. [10.1016/j.sna.2017.10.005]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/115322
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