In this work, the thermo-optical properties of a nematic liquid crystal are determined through reflectance measurements performed on a high finesse tunable filter fabricated using a polymer-based microcell technology. The final aim is to insert such material in the optical cavity of a 850 nm tunable VCSEL device, in which local self-heating due to CW pumping must be taken into account. These localized interferometric experiments are performed in the near-infra-red range and at temperatures up to 115 °C. A thermal model is derived from the acquired data. Finally, we demonstrate that the birefringence of QYPDLC-36 liquid crystal remains higher than 0.18 at 60 °C, feature well suited to real device operation.

Thermal characterization of a nematic liquid crystal suited for the fabrication of NIR spectrally-tunable vertical cavity surface emitting lasers / Simaz, Andrea; Boisnard, Benjamin; Baptiste Doucet, Jean; Camps, Thierry; Reig, Benjamin; Lumeau, Julien; Begou, Thomas; Tibaldi, Alberto; Debernardi, Pierluigi; Bardinal, Veronique. - In: OPTICAL MATERIALS EXPRESS. - ISSN 2159-3930. - ELETTRONICO. - 12:2(2022), pp. 383-391. [10.1364/ome.445217]

Thermal characterization of a nematic liquid crystal suited for the fabrication of NIR spectrally-tunable vertical cavity surface emitting lasers

Alberto Tibaldi;
2022

Abstract

In this work, the thermo-optical properties of a nematic liquid crystal are determined through reflectance measurements performed on a high finesse tunable filter fabricated using a polymer-based microcell technology. The final aim is to insert such material in the optical cavity of a 850 nm tunable VCSEL device, in which local self-heating due to CW pumping must be taken into account. These localized interferometric experiments are performed in the near-infra-red range and at temperatures up to 115 °C. A thermal model is derived from the acquired data. Finally, we demonstrate that the birefringence of QYPDLC-36 liquid crystal remains higher than 0.18 at 60 °C, feature well suited to real device operation.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2949305