aLIGO EOM at LLO and LHO Assembly/testing/installation

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Presentation transcript:

aLIGO EOM at LLO and LHO Assembly/testing/installation Volker Quetschke, Gregorio Tellez, Joseph Coleman, Center for Gravitational Wave Astronomy & Department of Physics and Astronomy The University of Texas at Brownsville and the LIGO-UF group Department of Physics University of Florida LIGO-G1200980

Assembly/testing/installation of the aLIGO phase modulators aLIGO modulators follow the design of the eLIGO modulators, but were adjusted to follow aLIGO specifications: Three electrode, wedged RTP crystal (rubidium titanyl phosphate - RbTiOPO4) Wedged avoids cavity effects and reduces amplitude modulation RTP has low absorption, is capable to handle 200W exhibits a small thermal lens Three electrodes on one crystal minimize the number of optical surfaces (and the price) 15 mm 7 mm Polarization Angle [degrees] p 5.2 s 4.7 LIGO-G1200980

Assembly/tuning at UTB Assemble modulators in clean environment Build and tune three simultaneous pi-network resonant circuits with 50 Ω input impedance. (9.1 / 24.1 / 45.5 MHz) LIGO-G1200980

Test at UF Finalize tuning at UF Measure sidebands Test high power compatibility Frequency [MHz] EOM-1: Number of turns per coil EOM-1pi network shunt capacitance EOM-2: Number of turns per coil EOM-2 pi network shunt capacitance 9.1 108 820 pF 102 680 pF 24.1 67 270 pF 68 45.5 31 210 pF 30 190 pF Frequency [MHz] EOM 1 EOM 2 9.1 0.325 0.388 24.1 0.117 0.184 45.5 0.310 0.299 Sidebands measured with three 24 dBm signals simultaneously driving all three electrodes Setup with 150W laser and realistic beam parameters to verify high-power compatibility LIGO-G1200980

Installation at LHO H2 12/2011 Was installed, but shortly after uninstalled and retuned for H1 frequencies LIGO-G1200980

Installation at LLO 07/2011 L1 modulator install LIGO-G1200980

Modulation depth for 24 dBm drive Some re-tuning was done 04/2012 https://alog.ligo-la.caltech.edu/ aLOG/index.php?callRep=3027 LIGO-G1200980

RFAM measurements with 24dBm drive RFAM vs. PM RFAM measurements with 24dBm drive https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=3034 Freq. PM RFAM RFAM/PM 45.3 0.15 6.2E-06 0.000041 9.18 0.39 3.9E-05 0.000100 24.0 0.09 1.0E-06 0.000012 LIGO-G1200980

Installation at LHO 08/2012 Modulation depth for 24 dBm drive https://alog.ligo-wa.caltech.edu/ aLOG/index.php?callRep=3693 LIGO-G1200980

RFAM vs. PM All went well https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=3695 Freq. PM RFAM RFAM/PM 45.5 0.31 5.5E-05 0.000177 9.1 0.39 9.13E-05 0.000234 24.1 0.14 3.17E-05 0.000226 LIGO-G1200980

Re-tuning for LIGO India? What’s Next? Re-tuning for LIGO India? LIGO-G1200980

Modulation depth / RFAM LLO LLO - Chris explanation: < https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=2901 > PM vs freq: < https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=3027 > AM at peak: < https://alog.ligo-la.caltech.edu/aLOG/index.php?callRep=3034 > LHO - PM vs freq: < https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=3693 > AM at peak: < https://alog.ligo-wa.caltech.edu/aLOG/index.php?callRep=3695 > LIGO-G1200980