A laser power feedback control system that features fast response, large-scale performance, low noise, and excellent stability is presented. Some essential points used for optimization are described. Primary optical lattice experiments are given as examples to show the performance of this system. With these performance characteristics, the power control system is useful for applications in cold atom physics and precision measurements.
A method that uses radio frequency （RF） spectroscopy to evaluate the alignment of an optical lattice is proposed and demonstrated. A one-dimensional （1D） optical lattice is applied along the long axis of a cigar-shaped Bose-Einstein condensate （BEC） in a magnetic trap. The RF spectra of condensates with and without the optical lattice are analyzed, measured, and compared with the condition in which the lattice is misaligned with the BEC. The proposed method greatly optimizes the optical alignments of the lattices.
