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 Nd:YAG 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)

3. The payload includes 3 instruments
Star Tracker Assembly
X-Band Antenna
Telescope Sunshade
Wide Field Camera
Imaging Infrared
Radiometer
Integrated Lidar Transmitter

4. 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

5. 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)

6. 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 #1 in Sealed Canister
Flight Laser #2 Prior to Lid Closure

8. Laser burn-in is part of the qualification process

9. Beam-expander optics are delivered and tested
All-reflective design
Mounts to laser optics module
Beam expansion 13x
f/1.4 primary mirror
>0.98 reflectivity at 532 and 1064 nm

10. Laser vibration test is done with mass model of beam expander

11. 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 3700:1

12. All-beryllium telescope has fast primary and f/4.7 secondary

13. Tested telescope assembly has been delivered from vendor

14. First fold mirror assembly includes field stop and flexure mounts

15. Refractive collimator and flexure mounts tested as a subassembly

16. Dichroics, mirrors, and polarizing beamsplitter tested separately

17. Sandwich etalon filter for 532 nm provides good optical performance

18. 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 >0.81
Contrast ratio >160
Birefringence <0.001 crosstalk

19. Flight APD includes preamp and stabilization circuitry
Based on MOLA design
QE 0.40
Noise pW Hz-½
Bandwidth 4 MHz

20. Cabling mockup prepares for final integration and test

21. Structures include optics bench, sunshade, and housing

22. Composite structure is assembled for testing

23. 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

24. Optical bench is a monolithic composite structure

25. Optical bench is also tested with mass models of components

26. 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 nm
512x512 CCD as push-broom scanner
RS-422 synchronous serial I/O
Flight PWAs
Flt Lens Assembly

27. 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)

28. Payload Simulator Allows testing of interface to spacecraft platform
Currently in service at Alcatel in France

29. Launch planned for April04
Dual launch with CloudSat on dual launch adapter fitting
Delta II 7420 launch vehicle
3-m standard fairing