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HgCdTe Avalanche Photodiode Arrays for Wavefront Sensing and Interferometry Applications Ian Baker and Gert Finger SE

2. Avalanche gain in HgCdTe . Avalanche photodiodesVoltage controlled gain at the point of absorptionAlmost no additional noiseNear-zero power consumptionUp to GHz bandwidthRequires no silicon real estate. HgCdTe ? a unique material Electron/hole mass ratio very large ? electron gets all the e

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HgCdTe Avalanche Photodiode Arrays for Wavefront Sensing and Interferometry Applications Ian Baker and Gert Finger SE

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    1. HgCdTe Avalanche Photodiode Arrays for Wavefront Sensing and Interferometry Applications Ian Baker* and Gert Finger** *SELEX Sensors and Airborne Systems Ltd, Southampton, UK **ESO, Garching, Germany

    2. 2 Avalanche gain in HgCdTe

    3. 3 Avalanche gain v. bias volts and cutoff wavelength

    4. 4 Avalanche gain v. bias volts and cutoff wavelength

    5. 5

    6. 6

    7. 7

    8. 8

    9. 9 Array operability performance BIL compared with SW

    10. 10 Avalanche gain for wavefront sensors

    11. 11

    12. 12

    13. 13 Experimental hybrid with variable junction diameters

    14. 14 Result of variable junction diameter experiment

    15. 15 ESO measurements on variable jn diameter array

    16. 16 NEPh v. Bias Volts as function dark current - to set dark current specification

    17. 17 Comparison of SELEX and ESO measurements of dark current v. temperature

    18. 18 ESO Electro-Optic Test Rig

    19. 19 Typical output from ESO Test Rig

    20. 20 ESO measurement of uniformity under moderate gain

    21. 21 ESO measurement of Avalanche Gain comparison with model

    22. 22 ESO measurement of Quantum Efficiency 70%

    23. 23

    24. 24

    25. 25

    26. 26 Dark current defect map under extreme conditions effect of temperature

    27. 27 Low photon flux imaging using avalanche gain

    28. 28 Modelled sensitivity based on measured data and with a custom ROIC

    29. 29 Conclusions on avalanche gain for wavefront sensing applications (A-O and interferometry)

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