The SHADOE Takes Form: Progress in UV and 2-micron HOEs
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Transcript of The SHADOE Takes Form: Progress in UV and 2-micron HOEs
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Wind Lidar Working Group, 29 June 2005 Welches, OR
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
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Topics
• HOEs & SHADOEs
• Holographic wavefront error correction
• SHADOE optical design
• Space qualifications
• 2-micron HOEs
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Wind Lidar Working Group, 29 June 2005 Welches, OR
HOEs & SHADOES
Rotating Holographic Optical Element (HOE)
Shared Aperture Diffractive Optical Element (SHADOE)
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Holographic Wavefront Correction for SHADOE LIDAR
Receivers
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
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Wind Lidar Working Group, 29 June 2005 Welches, OR
150°
Baseline Scan Configuration
Satellite nadir ground track
YA= 324 km
YB= 87 km
30°
Z = 400 km, = 40°
YC= 237 km 90°324 km
237 km
3 tracks, 6 lines of sight
0 90
seconds timing
12 7833 57
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Optical Layout(single HOE)
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Six-HOE SHADOE Design
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Conical Truss Frame
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Wind Lidar Working Group, 29 June 2005 Welches, OR
SHADOE Focal Spots, 2 power levels
mm units
inch units
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Solar UV exposure effects
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Wind Lidar Working Group, 29 June 2005 Welches, OR
2-Micron grating test
40-45% diff.eff.
Normal Incidence Transmission
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Summary
• HOEs & SHADOEs
• Holographic wavefront error correction under development
• SHADOE optical-mechanical design
• Space qualifications
• 2-micron HOEs
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Hybrid SHADOE Roadmap
TRL5TRL4
TRL3
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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
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Wind Lidar Working Group, 29 June 2005 Welches, OR
HOE Optical Properties
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’
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Wavefront Error Correction
Wave-front corrective
prescription applied to cover glass
Wave-front distortion caused by HOE materials
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Hybrid Concentric SHADOE Receiver
(One FOV shown)
IR
Wave-front corrective
lenses near focal plane
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Wind Lidar Working Group, 29 June 2005 Welches, OR
Hybrid R-T Combination SHADOE Receiver(One FOV shown)
UV Reflection SHADOE
IR Transmission SHADOE
IR Focal Plane
UV Focal Plane
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Wind Lidar Working Group, 29 June 2005 Welches, OR
UV HOE Doppler Demo