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Open Access Publications from the University of California

Beam Magnification and the Efficiency of Optical Trapping with 790-nm AlGaAs Laser Diodes

  • Author(s): Escandon, GJ
  • Liu, Y
  • Sonek, GJ
  • Berns, MW
  • et al.

Published Web Location Commons 'BY' version 4.0 license

The efficiency of dielectric particle confinement with 790-nm AlGaAs laser diode optical traps is investigated as a function of beam magnification and polarization state. When an anamorphic prism pair is used to correct for diode beam ellipticity, trapping efficiencies of nearly 0.37 are achieved with a magnification factor of 3X, laser powers of 4-18 mW, and an overfilled microscope objective entrance aperture. Results are compared for diodes having small (8 μm) and large (57 μm) astigmatisms, but comparable far-field divergence angles. © 1994 IEEE

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