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12 May 1995 Efficient collection and manipulation of laser diode output using refractive micro-optics
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Abstract
The collection efficiency and collimation ability of high numerical aperture circular and cylindrical GaP lenses were evaluated using single index-guided and gain-guided laser diode emitters. Comparisons were made between 200 micrometers focal length cylindrical lenses (NA equals 0.75) fabricated by an accurate repetitive step-wise etching method and 70 micrometers focal length cylindrical lenses (NA > 1) fabricated by a simple resist reflow technique. Lens arrays (200 - 300 micrometers fl, 0.5 - 0.75 NA) fabricated by the repetitive resist-etch method were used to collimate the output of a diode bar consisting of 100 index-guided elements. Refocusing of the collimated light with a macro-optic (for pumping a Nd:YVO4 laser) produced a spot that was on average 2 - 3 times larger than the diffraction limit and contained up to 88% of the total bar output. The deviation from the theoretical limit was examined in terms of lens fabrication accuracy and alignment tolerances between the diode and lens arrays, which were shown to be on the order of 1 - 2 micrometers .
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Todd S. Rose, David A. Hinkley, and Renny Arthur Fields "Efficient collection and manipulation of laser diode output using refractive micro-optics", Proc. SPIE 2383, Micro-Optics/Micromechanics and Laser Scanning and Shaping, (12 May 1995); https://doi.org/10.1117/12.209028
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