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    Phase pattern for 3x3 tweezer array, small tweezer spacing
Phase pattern for 3x3 tweezer array, small tweezer spacing

Phase pattern for 3x3 tweezer array, medium tweezer spacing
Phase pattern for 3x3 tweezer array, medium tweezer spacing

Phase pattern for 3x3 tweezer array, large tweezer spacing
Phase pattern for 3x3 tweezer array, large tweezer spacing

 

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Ryan White
Undergraduate, PMA

Laser tweezers, a precise tool used for atom trapping, can be generated by imprinting a phase pattern on a laser beam using a device called a spatial light modulator, then passing the beam through a lens. Given a desired tweezer pattern, the choice of the corresponding phase pattern is highly nontrivial, but an approximate solution can be found using the Gerchberg-Saxton Algorithm. By recursively performing Fourier transformations to simulate the passing of light through a lens, the GSA converges towards an approximate solution to the problem, outputting intricate phase patterns such as these.

rpwhite@caltech.edu

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