Title of Section

1
Space-Qualified Hardware for the CALIPSO Lidar
Ron Schwiesow Ball Aerospace and Technologies
Corp.
2
CALIPSO is a pathfinder for the GTWS mission

• Flight-qualified NdYAG lasers demonstrated to
  2?109 pulses
• Laser beam expanders with anti-feedback provision
• 1-m beryllium telescope (OCA/Corning)
• Flight-qualified PMT and APD detectors with
  associated preamps
• High-speed digitizer
• Powerful, flight-qualified computer with fault
  tolerance (General Dynamics PowerPC 603R)
• Auxiliary instruments for context imaging
  (Wide-field Camera and Imaging Infrared
  Radiometer)

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The payload includes 3 instruments
Star Tracker Assembly
X-Band Antenna
Telescope Sunshade
Wide Field Camera
Imaging Infrared Radiometer
Integrated Lidar Transmitter
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The payload includes 3 instruments
Wide Field Camera
Platform Electrical Interface Bracket
Star Tracker Assembly
X-Band Transmitter
Payload Controller
Laser Electronics Unit
Lidar Receiver Electronics
Receiver Power Supply
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Monolithic optical bench supports the lidar
Lidar Instrument Core
Active Boresight Mechanism
APD
PMTs
Laser Radiator
Optical Bench
Laser Optics Modules
Telescope
Beam Expander Optics
ILT (Integrated Lidar Transmitter)
ILR (Integrated Lidar Receiver)
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Risk-reduction laser proved concept

• 2?109 pulses demonstrated
• validated contamination-control procedures
• verified KTP doubler operation
• established misalignment tolerance
• showed benefits of derated components

7
Laser optics modules are tested and delivered
Flight Laser 2 Prior to Lid Closure
Flight Laser 1 in Sealed Canister
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Laser burn-in is part of the qualification process
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Beam-expander optics are delivered and tested

• All-reflective design
• Mounts to laser optics module
• Beam expansion 13x
• f/1.4 primary mirror
• gt0.98 reflectivity at 532 and 1064 nm

10
Laser vibration test is done with mass model of
beam expander
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Laser functional test verifies performance

• 110 mJ each wavelength
• 20.25-Hz PRF
• 25-pm linewidth at 532 nm
• 6-8 mm-mrad beam quality
• polarization purity 37001

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All-beryllium telescope has fast primary and
f/4.7 secondary
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Tested telescope assembly has been delivered from
vendor
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First fold mirror assembly includes field stop
and flexure mounts
15
Refractive collimator and flexure mounts tested
as a subassembly
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Dichroics, mirrors, and polarizing beamsplitter
tested separately
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Sandwich etalon filter for 532 nm provides good
optical performance
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Sandwich etalon passed thermal and mechanical
qualification

• Housing provides thermal stabilization and
  uniformity
• Etalon polished to approximate wavelength,
  angle-tuned to precise wavelength, thermal tuned
  to track changes
• Bandpass 42 pm
• Peak transmission gt0.81
• Contrast ratio gt160
• Birefringence lt0.001 crosstalk

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Flight APD includes preamp and stabilization
circuitry

• Based on MOLA design
• QE 0.40
• Noise 0.004 pW Hz-½
• Bandwidth 4 MHz

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Cabling mockup prepares for final integration and
test
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Structures include optics bench, sunshade, and
housing
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Composite structure is assembled for testing
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The composite structure is qualified with mass
models in place

• Structure includes sunshade
• Components mounted to outside of payload housing
• Optical bench floats inside housing

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Optical bench is a monolithic composite structure
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Optical bench is also tested with mass models of
components
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Wide-field camera is based on standard CT-633
star tracker

• Longer lens, narrower FOV than CT-633
• Neutral density filter with full aperture
• Bandpass filter 620 - 670 nm
• 512x512 CCD as push-broom scanner
• RS-422 synchronous serial I/O

Flight PWAs
Flt Lens Assembly
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Imaging infrared radiometer is developed by SODERN

• Based on Boeing microbolometer arrays
• Mirror for 2-point calibration
• 64?64 snapshot array
• 3 spectral channels sequential

Mirror Mechanism EM
Housing Structure Eng Model
Flight Infrared Sensor Module (IASI)
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Payload Simulator

• Allows testing of interface to spacecraft
  platform
• Currently in service at Alcatel in France

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Launch planned for April04

• Dual launch with CloudSat on dual launch adapter
  fitting
• Delta II 7420 launch vehicle
• 3-m standard fairing