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arXiv:physics/0512150 · Journal of Optics A Pure and Applied Optics

Generation of multiple power-balanced laser beams for quantum-state manipulation experiments with phase-stable double optical lattices

S J H Petra, P Sjölund, Anders Kastberg

Published Mar 21, 2006• 6 citations
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Abstract

We present a method to obtain power-balanced laser beams for doing quantum-state manipulation experiments with phase-stable double optical lattices. Double optical lattices are constructed using four pairs of overlapped laser beams with different frequency. Our optical scheme provides a phase stability between the optical lattices of 5 mrad/s and laser beams with a very clean polarisation state resulting in a power imbalance in the individual laser beams of less than 1%.

DOI
10.1088/1464-4258/8/5/003

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We present a method to obtain power-balanced laser beams for doing quantum-state manipulation experiments with phase-stable double optical lattices. Double optical lattices are constructed using four pairs of overlapped laser beams with different frequency. Our optical scheme provides a phase stability between the optical lattices of 5 mrad/s and laser beams with a very clean polarisation state resulting in a power imbalance in the individual laser beams of less than 1%.
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We describe the design and implementation of a stable high-power 1064 nm laser system to generate optical lattices for experiments with ultracold quantum gases. The system is based on a low-noise laser amplified by an array of four heavily modified, high-power fiber amplifiers. The beam intensity is stabilized and controlled with a nonlinear feedback loop. Using real-time monitoring of the resulting optical lattice, we find the stability of the lattice site positions to be well below the lattice spacing over the course of hours. The position of the harmonic trap produced by the Gaussian envelope of the lattice beams is stable to about one lattice spacing and the long-term (six-month) relative root-mean-square stability of the lattice spacing itself is 0.5%.
We describe the design and implementation of a stable high-power 1064 nm laser system to generate optical lattices for experiments with ultracold quantum gases. The system is based on a low-noise laser amplified by an array of four heavily modified, high-power fiber amplifiers. The beam intensity is stabilized and controlled with a nonlinear feedback loop. Using real-time monitoring of the resulting optical lattice, we find the stability of the lattice site positions to be well below the lattice spacing over the course of hours. The position of the harmonic trap produced by the Gaussian envelope of the lattice beams is stable to about one lattice spacing and the long-term (six-month) relative root-mean-square stability of the lattice spacing itself is 0.5%.
Controlling atoms by light is important for investigating the atom-atom entanglement and atom-atom dipole interaction.It is also a key issue for quantum information.Based on our present experimental system,we propose a scheme of generating adjustable multiple optical dipole traps by using three strongly focused beams,which implies controllable optical lattice for atom manipulation.We discuss in detail the influence of the incident angle and the phase difference on the depth and position of the traps and demonstrate that the manipulation of individual atom and control of trap-trap distance are realizable.It is of great importance in studying interaction between BECs in optical lattices,atom interference and atomic dipole-dipole interaction.