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Homogeneous one-dimensional optical lattice generation using a digital micromirror device-based high-precision beam shaper

[+] Author Affiliations
Jinyang Liang

University of Texas at Austin, Department of Electrical and Computer Engineering, Austin, Texas 78712

Rudolph N. Kohn

University of Texas at Austin, Department of Physics, Austin, Texas 78712

Michael F. Becker

University of Texas at Austin, Department of Electrical and Computer Engineering, Austin, Texas 78712

Daniel J. Heinzen

University of Texas at Austin, Department of Physics, Austin, Texas 78712

J. Micro/Nanolith. MEMS MOEMS. 11(2), 023002 (May 21, 2012). doi:10.1117/1.JMM.11.2.023002
History: Received December 1, 2011; Revised February 9, 2012; Accepted March 9, 2012
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Abstract.  A homogeneous one-dimensional optical lattice is demonstrated by using a high-precision beam shaper based on a digital micromirror device (DMD) with an imaging system containing a pinhole low-pass filter (LPF). This system is capable of producing a high-quality flattop beam profile to form a standing-wave optical lattice with a 50×50μm2 flattop region. The periodic potential generated by the optical lattice confines ultracold atoms in Bose-Einstein condensate experiments. We conducted beam shaping tests at several wavelengths by implementing various coherent and incoherent light sources in the visible and infrared wavelength ranges. Experiments produced flattop and other well-controlled beam profiles with 0.2% to 0.26% root-mean-square (RMS) error after applying a digital LPF and nearly flat phase. Several concerns for the system design are presented. First, the energy requirement was determined by power conversion analysis and DMD diffraction efficiency simulation. In addition, a LabVIEW program was written to accelerate the speed of the iterative process for beam profile refinement. Finally, various camera calibrations improved the measurement accuracy. We achieved a 1.25% RMS error flattop beam with diameter of 70.4 μm at the atoms’ plane. Other beam profile measurements in different diagnostic planes demonstrated a good intensity uniformity of the optical lattice.

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© 2012 Society of Photo-Optical Instrumentation Engineers

Citation

Jinyang Liang ; Rudolph N. Kohn, Jr. ; Michael F. Becker and Daniel J. Heinzen
"Homogeneous one-dimensional optical lattice generation using a digital micromirror device-based high-precision beam shaper", J. Micro/Nanolith. MEMS MOEMS. 11(2), 023002 (May 21, 2012). ; http://dx.doi.org/10.1117/1.JMM.11.2.023002


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