2. 1 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto

3. 2 J. Franc, WP3 meeting 09/06/09 [1] Virgo coll.,Advanced Virgo baseline design, VIR-027A-09 [2] Punturo M. & al., Class. Quant. Grav. 27, 2010 [3] Mours B. & al., Class. Quant. Grav. 23, 2006 [4] Vinet J. Y., Living Rev. Relativity 12, 2009 therm. noise [m/sqrt(Hz)] frequency [Hz] LG00 LG33

4. 3 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto

5. 4

6. 5 w 0 = 2.15 mmw 0 ~ 288 μm

7. 6 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto

8. 7 EOM LASER FARADAY ISOLATOR MODE MATCHING TELESCOPE DOE lens X/Y/Z mount LG00 LG33 LG00/LG33 switch transmitted LG33 MODE CLEANER M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto LG00 DOE

9. 8 plano/concave monolithic cavity Finesse = 103, FSR = 500 MHz stable locking (hours) on LG33 30 cm PD CCD M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto EOM DOE mode-matching telescopes LG00 path PD mixer servo radiofrequency PD mode-cleaner Faraday isolator

10. 9 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto aligned modeX misal.Y misal.

11. LG1 l LG2 l 10 30 cm PD CCD M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto LG33 transmission: P out / P in = 37 % other modes: P other / P total = 45.7 % LG33 LG4 l P in P out throughput = 90 %   P in LG33 = 41 % 

12. 11 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto 1.2 cm LG33 - theory LG33 - measure

13. 12 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto NOT A FIT

14. 13 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto

15. 14 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto LASER MODE CLEANER LG00/LG33 switch LG33 MICH. ITF mirr. + PZT mirror BS

16. 15 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto dark fringe locking screenshot fringe visibility: V = (P max -P min ) / (P max +P min ) = 97 % PRELIMINARY

17. 16 M. Granata, M. Barsuglia, C. Buy, R. Ward – GWADW 2010, Kyoto

18. ...end.