LIGO-G030383-00-Z High Power Components for Advanced LIGO University of Florida Rupal Amin, Joe Gleason, Rachel Parks Christina Leidel, Mike Marquez, Luke.

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Presentation transcript:

LIGO-G Z High Power Components for Advanced LIGO University of Florida Rupal Amin, Joe Gleason, Rachel Parks Christina Leidel, Mike Marquez, Luke Williams Guido Mueller, David Reitze, D.B. Tanner 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-G Z

Input Optics

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

LIGO-G Z EOM Stabilization of EOM: Temperature stabilized Brewster polarizer RF-shield Thermal shield Stabilization of Input field: Polarization Pointing Intensity

LIGO-G Z EOM Summary EOM: RTA & RTP work at 45W laser power Stability measurements just started Outlook: need 100W laser for more tests

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

LIGO-G Z Faraday Isolator Lens Compensation Polarizer Faraday Crystal Depolarization in TGG and FK51 Higher Order Modes Compensator1pcs FK512pcs FK51Crystal Losses 125W~5%AR-coating CommentDepolarizationDistance ? See: Compensation of thermally induced modal distortions in FI, upcoming paper

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

LIGO-G Z Faraday Isolator Probe Heating Laser Analyzer Cavity CCD for Mode analysis PD for Intensity measurement FR Pol Data: Intensity in different Cavity Eigenmodes SMF

LIGO-G Z Faraday Isolator Experimental Results: No thermal lensing up to 35W laser power Low losses Isolation > 40dB (with Comp. outside Isolator) Options: 1.Two glass compensators (FK51) with wave plate 2.Crystal Compensator (YLF)

LIGO-G Z 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

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

LIGO-G Z Adaptive Mode matching 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

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

LIGO-G Z Adaptive Mode matching f ~ 5.7m f ~ 2.5m f ~ 1.3m

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

LIGO-G Z High Power Components 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)

LIGO-G Z Faraday Isolator