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High Power Components for Advanced LIGO

High Power Components for Advanced LIGO. Rupal Amin, Joe Gleason, Rachel Parks Christina Leidel, Mike Marquez, Luke Williams Guido Mueller , David Reitze, D.B. Tanner. University of Florida. Nikolay Andreev, Efim Khazanov, Anatoly Mal’shakov, Oleg Pashin, Anatoly Poteomkin,

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High Power Components for Advanced LIGO

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  1. High Power Components for Advanced LIGO Rupal Amin, Joe Gleason, Rachel Parks Christina Leidel, Mike Marquez, Luke Williams Guido Mueller, David Reitze, D.B. Tanner University of Florida Nikolay Andreev, Efim Khazanov, Anatoly Mal’shakov, Oleg Pashin, Anatoly Poteomkin, Andrey Shaykin, Victor Zelenogorsky Institute of Applied Physics of Russian Academy of Science LIGO-G030383-00-Z

  2. Input Optics EOM PSL Mode Cleaner Isolator Adaptive Mode matching IFO

  3. Objectives: Modulation of m>0.1 at 180MHz R Beam Distortion < 1% (Rat 45W) Total losses < 2% (Rat 45W) RFAM-Stability ? In Band (direct coupling) Out of Band (Offset drifts, …) at 200W laser input power. Disclaimer: Objectives/Requirements subject to change ! EOM Each EOM

  4. EOM • Stabilization of EOM: • Temperature stabilized • Brewster polarizer • RF-shield • Thermal shield • Stabilization of Input field: • Polarization • Pointing • Intensity

  5. Summary EOM: RTA & RTP work at 45W laser power Stability measurements just started Outlook: need 100W laser for more tests EOM

  6. Objectives: Isolation ratio (>30dB) Beam Distortion < 3% Total losses < 6% at 20 and 135W laser power. Disclaimer: Objectives/Requirements subject to change ! Faraday Isolator

  7. Faraday Isolator Faraday Crystal Lens Compensation Polarizer Polarizer Higher Order Modes Depolarization in TGG and FK51 See: Compensation of thermally induced modal distortions in FI, upcoming paper

  8. Depolarization P (heating Laser) = 38W only one piece FK51 w/o Compensation w. FK average w. FK f-Pol w. FK r-Pol See: Compensation of thermally induced modal distortions in FI, upcoming paper

  9. Faraday Isolator Heating Laser Pol FR Probe SMF Pol CCD for Mode analysis Analyzer Cavity PD for Intensity measurement Data: Intensity in different Cavity Eigenmodes

  10. Faraday Isolator • Experimental Results: • No thermal lensing up to 35W laser power • Low losses • Isolation > 40dB (with Comp. outside Isolator) • Options: • Two glass compensators (FK51) with wave plate • Crystal Compensator (YLF)

  11. Faraday Isolator • Outlook (for FK51 compensated Isolator): • waiting for 100W laser at LLO • (delayed again …) • measure thermal distortion & ~depolarization at 100W • measure isolation ratio at 100W • Start experiments with YLF-crystal based compensation at UF

  12. Objectives: Change the mode matching between MC and IFO without breaking the vacuum Dynamic Range ? Power: 20-130W ? (Change IFO Eigenmode by ~20% ) No moving parts No additional beam distortion Adaptive Mode Matching

  13. Idea: Create Thermal lens with a heating beam Material: absorb heating beam transmit main laser Heating beam: at least factor 2 larger than main laser Adaptive Mode matching

  14. Adaptive Mode matching Heating Beam: Argon Laser (30W) Probe Laser: NPRO Thermal Lens Material: OG515 - absorbs green - transmits IR Diagnostic: Beam Scan

  15. Adaptive Mode matching f ~ 5.7m f ~2.5m f ~ 1.3m

  16. Outlook: Experiments have to go beyond proof of principle Need to derive requirements on dynamic range Design experiment for optimized performance Work on theory Adaptive Mode matching

  17. Summary: All Components look good so far, no major technological problems (yet) Outlook / Problems: Need to test with more laser power Production ? (because of # of components needed) High Power Components

  18. Faraday Isolator

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