GSFC Scanning Holographic Receivers for Air and Space Geary Schwemmer Meeting of the Working Group on Space-based Lidar Winds Sedona, Arizona January 27.

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Presentation transcript:

GSFC 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

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

GSFC Airborne Molecular Scanning Telescope DLTA UV Cornerstone

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

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

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

GSFC UV HOE

GSFC Parabolic Mirror d=400mm f=3000mm HOE CCD Camera Monitor & frame grabber Mirror Beam Splitter Cube Spatial Filter Focusing Lens CCD Camera at Collimator Focal Plane YAG Laser 355nm 532nm 1064nm Beam Dump Dichroic Beam Splitters Aperture2Aperture1 Mirror UV HOE Test Setup

GSFC Laboratory Test Setup

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

GSFC Materials-induced aberrations HOE focal spot before cappingHOE focal spot after capping 200 µm

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

GSFC Diffraction Limited HOEs using wet-etch surface figuring for wavefront error correction

GSFC Hybrid Concentric SHADOE Receiver (One FOV shown) IR Wave-front corrective lenses near focal plane

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

GSFC Acknowledgements 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