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Scanning Holographic Receivers for Air and Space

Geary Schwemmer Meeting of the Working Group on Space-based Lidar Winds Sedona, Arizona January 27 – 29, 2004 Work supported by: IPO & NASA. Scanning Holographic Receivers for Air and Space. Airborne Molecular DWL Scanning Telescope Recent UV HOE test results Diffraction limited HOEs

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Scanning Holographic Receivers for Air and Space

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  1. Geary Schwemmer Meeting of the Working Group on Space-based Lidar Winds Sedona, Arizona January 27 – 29, 2004 Work supported by: IPO & NASA Scanning Holographic Receivers for Air and Space

  2. Airborne Molecular DWL Scanning Telescope Recent UV HOE test results Diffraction limited HOEs Hybrid SHADOE concepts Topics

  3. Airborne Molecular Scanning Telescope DLTA UV Cornerstone

  4. Option 1 Beam becomes elliptical! 45deg. Custom 34.7deg wedge angle, fused silica prisms (2) 400mm dia. HOE 10mm dia. Laser

  5. C/L 45deg. 59mm HOE: 400mm dia., 52.5mm dia. offset hole, 45deg bore angle Fold Mirror: 67.5 AOI, 90mm x 40mm ~4” Option 1B 30mm dia. Laser

  6. Option 2 C/L HOE: 400mm dia., 52.5mm dia. centered hole, 45deg bore angle 45deg. ~4” Fold Mirror 1: 45 AOI, 2” dia. Fold Mirror 2: 22.5 AOI, 2” dia. 30mm dia. Laser Side View

  7. UV HOE

  8. HOE Mirror Parabolic Mirror d=400mm f=3000mm CCD Camera CCD Camera at Collimator Focal Plane Beam Splitter Cube Dichroic Beam Splitters Spatial Filter Beam Dump Focusing Lens 1064nm YAG Laser 532nm Monitor & frame grabber 355nm Mirror Aperture2 Aperture1 UV HOE Test Setup

  9. Laboratory Test Setup

  10. Test Results for UV HOE with central hole • Spot size : 250 µm (encircles 86.5% of the total energy) • Focal Length : 993 mm  2mm • Diffraction Angle : 45.26  0.5 deg • Diffraction Efficiency : 62 3 %

  11. 200 µm 200 µm Materials-induced aberrations HOE focal spot before capping HOE focal spot after capping

  12. Wavefront Error Correction Wave-front distortion caused by HOE materials Wave-front corrective prescription applied to cover glass

  13. Diffraction Limited HOEsusing wet-etch surface figuring for wave-front error correction

  14. Hybrid Concentric SHADOE Receiver(One FOV shown) Long Playing 33 1/3 RPM IR UV Wave-front corrective lenses near focal plane

  15. Hybrid R-T Combination SHADOE Receiver(One FOV shown) UV Focal Plane UV Reflection SHADOE IR Transmission SHADOE IR Focal Plane

  16. Funding: NASA SBIR, IPO, GSFC IR&D Lab testing: Sangwoo Lee - Science Systems and Applications, Greenbelt, MD UV Cornerstone: Tom Wilkerson – SDL & USU Optical designs: Luis Ramos Wet - Etch wavefront correction: John Toeppen – Lawrence Livermore National Laboratory Acknowledgements

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