Oct 23 – 25, 2019
Aula Gerace
Europe/Rome timezone
We had been hoping to be able to hold the conference on the originally scheduled period in October 2021 but given the pandemic situation we have decided to postpone the conference period to October 2022.

Holographically-generated optical traps for ultracold atoms

Oct 25, 2019, 3:45 PM
Aula Gerace

Aula Gerace

Polo Fibonacci Edificio C Largo B. Pontecorvo, 3 56127 Pisa
poster Quantum Gases Posters and Coffee


Dr Donatella Cassettari (University of St Andrews)


The development of new laser-beam shaping methods is important in a variety of fields within optics, atomic physics and biophotonics. Spatial light modulators offer a highly versatile method of time-dependent beam shaping, based on imprinting a phase profile onto an incident laser beam which then determines the intensity in the far field, where the atoms are trapped. The calculation of the required phase is a well-known inverse problem, which can be tackled with different approaches. Our method based on conjugate gradient minimisation [1] not only allows the calculation of smooth and accurate intensity profiles suitable for trapping cold atoms, but can also be used to generate multi-wavelength traps [2] and for simultaneous control over both the intensity and the phase of the light [3], with exceptionally high reconstruction fidelity.
Here we describe our experimental progress of trapping ultracold atoms in arbitrary SLM-generated traps. In this experiment, we demonstrate two reservoirs connected by a channel, a guide interrupted by a junction, and a cross shape with a junction at the centre. The width of the junctions in these light patterns is determined by the diffraction limit of our optics. The cross pattern has a possible future application to the simulation of the topological Kondo effect with ultracold atoms [4].

[1] T Harte et al., Opt. Express 22, 26548 (2014).
[2] D. Bowman et al., Opt. Express 23, 8365 (2015).
[3] D. Bowman et al., Opt. Express 25, 11692 (2017).
[4] F. Buccheri et al., New J. Phys. 18, 075012 (2016).

Primary author

Dr Donatella Cassettari (University of St Andrews)


Dr Phil Ireland (University of St Andrews) Dr David Bowman (ColdQuanta) Dr Graham Bruce (University of St Andrews)

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