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Present status of

Present status of. LAPP – 10 / 03 / 2010. Previous photodiodes. Virgo set of photodiodes Hammamatsu InGaAs Ø = 3mm η > 95 % typ. Idark <10 nA @ Vbias = 10 V Brkdown volt. = 50 V Imax ~ 100 mA fc ~ 70 MHz Rs ~ 8 – 10 Ω Cs < 280 pF @ Vbias = 10 V. Advanced requirements.

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  1. Present status of LAPP – 10 / 03 / 2010

  2. Previous photodiodes • Virgo set of photodiodes • Hammamatsu • InGaAs • Ø = 3mm • η > 95 % typ. • Idark <10 nA @ Vbias = 10 V • Brkdown volt. = 50 V • Imax ~ 100 mA • fc ~ 70 MHz • Rs ~ 8 – 10 Ω • Cs < 280 pF @ Vbias = 10 V

  3. Advanced requirements • Increase of the modulation frequency • fmax ~ 2 x 70 Mhz • Increase of incident power • Photodiodes should handle ~ 200 mW • Resulting requirements for AdV photodiodes • Basically the same as for Virgo • Plus : • lower Cs (with the same Ø) • Increase Imax

  4. Review of current photodiodes • Exhaustive review of commercial solutions • 8 manufacturers • Hammamatsu, Perkin Elmer, Roithner, Fermionics, GPD, eGtran, EOS, Judson • No major tech improvements for 10 yrs • Pre selection : • Only 3 remaining manufacturers from which we bought samples • Perkin Elmer (x 5) • Fermionics (x 3) • Judson (x 2) • Those samples are under characterization • use of Virgo preamp.

  5. I Dark

  6. Equivalent electrical scheme • LCR meter • Perkin Elmer • fc ~ 93 MHz • Fermionics • fc ~ 41 MHz • Judson • fc ~ 468 MHz

  7. DC Linerarity measurements • Measurement are made by varying the source intensity • beam splitter • the emitted power is measured using a powermeter • At present • met some difficulties to obtain a reliable absolute measurement • comparison of several pwm are out of the +/- 4% measurement accuracy • no coating • First estimation of η • Perkin Elmer ~ 80 % • Fermionics ~ 60 % • Judson ~ 40 %

  8. Frequency response • We investigate several way of modulating the intensity beam on a wide range of frequency (typ 1- 100 MHz) • AOM (fiber or not) • high frequency limited • pockels cells • difficulties to reach good modulation index on the whole frequency range • Commercial solution from photline • fiber EOM • from 100 kHz up to 250 MHz • delivered within 5 weeks • output power limited to some 10mW

  9. PE0794

  10. PE0795

  11. PE0796

  12. PE0797

  13. PE0798

  14. F1

  15. F2

  16. F3

  17. J1

  18. J2

  19. Commandes passées • Perkin Elmer • 5 photodiodes – 1950 € HT • Commandées le 03/11/09 • Livraison : 8 à 14 semaines • Fermionics • 3 photodiodes – 802 € HT • Commandées le 05/11/09 • Livraison : 1 à 2 semaines • Judson • 2 photodiodes – 1861 € HT • Commandées le 12/11/09 • Livraison : 2 à 4 semaines

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