Realization of a high power optical trapping setup free from thermal lensing effects

Year: 2019

Authors: Simonelli C.; Neri E.; Ciamei A.; Goti I; Inguscio M.; Trenkwalder A.; Zaccanti M.

Autors Affiliation: Istituto Nazionale di Ottica del Consiglio Nazionale delle Ricerche (CNR-INO), Sesto Fiorentino, 50019, Italy; Dipartimento di Fisica e Astronomia, Universita di Firenze, Sesto Fiorentino, 50019, Italy; European Laboratory for Non-Linear Spectroscopy (LENS), Universita di Firenze, Sesto Fiorentino, 50019, Italy; Department of Engineering, Campus Bio-Medico, University of Rome, Rome, 00128, Italy

Abstract: Transmission of high power laser beams through partially absorbing materials modifies the light propagation via a thermally-induced effect known as thermal lensing. This may cause changes in the beam waist position and degrade the beam quality. Here we characterize the effect of thermal lensing associated with the different elements typically employed in an optical trapping setup for cold atoms experiments. We find that the only relevant thermal lens is represented by the TeO2 crystal of the acousto-optic modulator exploited to adjust the laser power on the atomic sample. We then devise a simple and totally passive scheme that enables to realize an inexpensive optical trapping apparatus essentially free from thermal lensing effects. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Journal/Review: OPTICS EXPRESS

Volume: 27 (19)      Pages from: 27215  to: 27228

More Information: European Research Council (637738-PoLiChroM); Italian MIUR FARE (R168HMHFYM-P-HeLiCS).
KeyWords: distortion; temperature
DOI: 10.1364/OE.27.027215

Citations: 6
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