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The SHADOE Takes Form: Progress in UV and 2-micron HOEs

Geary Schwemmer Meeting of the Working Group on Space-based Lidar Winds Welches, Oregon June 28- July 1, 2005 Work supported by: IPO & NASA. The SHADOE Takes Form: Progress in UV and 2-micron HOEs. HOEs & SHADOEs Holographic wavefront error correction SHADOE optical design

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The SHADOE Takes Form: Progress in UV and 2-micron HOEs

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  1. Geary Schwemmer Meeting of the Working Group on Space-based Lidar Winds Welches, Oregon June 28- July 1, 2005 Work supported by: IPO & NASA The SHADOE Takes Form: Progress in UV and 2-micron HOEs

  2. HOEs & SHADOEs Holographic wavefront error correction SHADOE optical design Space qualifications 2-micron HOEs Topics

  3. HOEs & SHADOES Shared Aperture Diffractive Optical Element (SHADOE) Rotating Holographic Optical Element (HOE)

  4. Wasatch Photonics SBIR Phase 1 355 nm Wavefront correction to < 50 µrad FOV 30° in / 30° out 90% efficiency (per optic, 80% system) afocal and focusing designs 5-6 FOVs 40 cm primary Phase 2 355, 1064 & 2054 nm 40° in / 30° out diffraction limited spots (2054 nm only) 50 – 100 cm primary Holographic Wavefront Correction for SHADOE LIDAR Receivers

  5. Baseline Scan Configuration 3 tracks, 6 lines of sight 237 km 30° YA= 324 km YB= 87 km 150° Satellite nadir ground track 324 km 90° YC= 237 km 0 12 78 90 33 57 seconds timing Z = 400 km,  = 40°

  6. Optical Layout(single HOE)

  7. Six-HOE SHADOE Design

  8. Conical Truss Frame

  9. SHADOE Focal Spots, 2 power levels mm units inch units

  10. Solar UV exposure effects

  11. 2-Micron grating test Normal Incidence Transmission 40-45% diff.eff.

  12. HOEs & SHADOEs Holographic wavefront error correction under development SHADOE optical-mechanical design Space qualifications 2-micron HOEs Summary

  13. Hybrid SHADOE Roadmap TRL3 TRL4 TRL5

  14. 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

  15. Working Copy Master Spot Size at 86% of Total Energy 250 µm 215 µm Focal Length 993 mm 995 mm Diffraction Efficiency ~62 % ~40 % Diffraction Angle 45o26’ 44o81’ HOE Optical Properties

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

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

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

  19. UV HOE Doppler Demo

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