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Advanced LIGO R&D Review Input Optics Peter King for the University of Florida

Advanced LIGO R&D Review Input Optics Peter King for the University of Florida (Dave Reitze, David Tanner, …) October 8, 2002. Current Status. Design Requirements Review (DRR) held May 2002 results obtained for high power Faraday isolator > 45 dB isolation achieved

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Advanced LIGO R&D Review Input Optics Peter King for the University of Florida

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  1. Advanced LIGO R&D Review Input Optics Peter King for the University of Florida (Dave Reitze, David Tanner, …) October 8, 2002.

  2. Current Status • Design Requirements Review (DRR) held May 2002 • results obtained for high power Faraday isolator • > 45 dB isolation achieved • throughput might be a problem • results obtained with passive compensation of thermal lensing • uses material of opposite dn/dT

  3. dn dT dn dT TGG FK51 Handling High Powers in Advanced LIGO High power Faraday isolation Passive compensation of thermal lensing IAP, Nizhny Novgorod • DOPD(r) compensated by introduction of opposite • signed dn/dt • 97.5% retention of TEM00 mode (60% with no • compensation • Thermally-induced stress birefringence reduces • isolation at high powers • dual-crystal design compensates for birefring- • ence; > 45 dB isolation

  4. Adaptive Mode Matching in Advanced LIGO • 125 W into interferometer • thermal lensing alters mode-matching • two operational points (125W, 20 W) for different searches • in situ adjustment of mode matched based on laser/radiative heating • Thermal modal modeling of laser heating: • 1 m < fMMT1 < ; 99.5% TEM00

  5. Schedule • LASTI optics design Aug. 2002 • Preliminary Design Review (PDR) July 2003 • modulator and isolator prototype fabricated, Dec. 2004 • Final Design Review (FDR) Aug. 2006

  6. Cost Baseline & Issues • funds for a cw 100-W high power laser requested • VersaDisk-1030-100 Yb:YAG laser, ~$100k • 20 week delivery • to be stationed at LLO • will be purchased once suitable UF personnel are at LLO • planning on hiring an electronics engineer • funding figures (from DRR) • sub-system management $225,150 • design $1,360,977 • fabrication $3,170,122 • total $4,756,250

  7. Staffing • 2 scientists, 2 postdoctoral scholars, 2 graduate students • scientists are not full-time • hope to hire an electronics engineer

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