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Generation of the controllable triple-well optical trap by liquid-crystal spatial light modulator

Zhou Qiao-Qiao Xu Shu-Wu Lu Jun-Fa Zhou Qi Ji Xian-Ming Yin Jian-Ping

Generation of the controllable triple-well optical trap by liquid-crystal spatial light modulator

Zhou Qiao-Qiao, Xu Shu-Wu, Lu Jun-Fa, Zhou Qi, Ji Xian-Ming, Yin Jian-Ping
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  • Received Date:  27 February 2013
  • Accepted Date:  10 April 2013
  • Published Online:  05 August 2013

Generation of the controllable triple-well optical trap by liquid-crystal spatial light modulator

  • 1. School of Science, Nantong University, Nantong 226007, China;
  • 2. State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China;
  • 3. School of Science, East China Institute of Technology, Fuzhou 344000, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant Nos. 11034002, 11274114), the National Key Basic Research and Development Program of China (Grant No. 2011CB921602), and the Open Research Fund of State Key Laboratory of Precision Spectroscopy, East China Normal University.

Abstract: A new scheme of generating the controllable triple-well optical trap is proposed, in which a liquid-crystal spatial light modulator (SLM) is used to fabricate the phase-type blazed grating and be illuminated with coherent monochromatic light. Three optical wells, each of which has the same intensity distribution, can be formed with relative position of the distribution of an equilateral triangle. The relative positions of the optical wells can be changed by simply and conveniently adjusting the phase distribution of the SLM to realize the evolution and reverse evolution from triple or dual wells to single well. The phase grating is designed by simulation according to the technical parameters of the SLM, and illuminated by the laser with ordinary power. The intensity distributions and intensity changes in the adjustment process for the triple wells are calculated. Results show that the controllable triple-well optical trap with very high peak value of intensity and intensity gradient can be obtained. It has many important applications in the experimental study of atomic and molecular optics.

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