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| . We are developing a technique of Arm Length Stabilization (ALS) for advanced LIGO. The technique employs two auxiliary green lasers at each end of the arm. Basically these lasers are able to sense the displacement of the each arm independently on the main laser, eventually make full lock acquisition of advanced interferometer more robust and reliable. [[BR]] [[BR]] ''' Table of Contents ''' <<TableOfContents([2])>> [[BR]] |
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| ------- | = Conceptual Design = |
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| == Designs and Plans == === time line === * The time line describes where we are now and where we go. B) [[Upgrade 09/GreenLock/timeline|time line]] * '''Design and Purchasing Lists''' * Optical design / [[Upgrade 09/Purchase List/Green Locking|item list]] * Electronics / control design / [[Upgrade 09/Purchase List/Green Locking|item list]] * [[Upgrade 09/Purchase List/Green Locking|Purchase list]] === Conceptual design === * Description of the optical / servo configuration [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888 LIGO DCC] * Servo modeling (!SimLink) [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ 40mSVN] ==== Green Preliminary Design ==== . <<ImageLink(green_vertex_preliminary_design.png,Upgrade 09/GreenLock/Preliminary design for the vertex,height=200)>> |
<<ImageLink(green_vertex_preliminary_design.png,Upgrade 09/GreenLock/Preliminary design for the vertex,height=200)>> |
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| ------- == Installation status == |
Optical Layout ([attachment:green_optics.png Table]/ In-vac) [[Upgrade 09/GreenLock/end table|ETM / end table]] <<ImageLink(endtable.jpg,Upgrade 09/GreenLock/end_table)>> [[Upgrade 09/Optical Layout#wedge|ITM wedge effect]] [[Upgrade 09/Optical Layout|Periscopes for beam steering from PR3/SR3 transmissions to the PSL viewport]] |
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| * '''Design and Purchasing Lists''' * Optical design / [[Upgrade 09/Purchase List/Green Locking|item list]] * Electronics / control design / [[Upgrade 09/Purchase List/Green Locking|item list]] * [[Upgrade 09/Purchase List/Green Locking|Purchase list]] * '''Detailed considerations''' * Optical Layout ([attachment:green_optics.png Table]/ In-vac) * [[Upgrade 09/GreenLock/end table|ETM / end table]] <<ImageLink(endtable.jpg,Upgrade 09/GreenLock/end_table)>> * [[Upgrade 09/Optical Layout#wedge|ITM wedge effect]] * [[Upgrade 09/Optical Layout|Periscopes for beam steering from PR3/SR3 transmissions to the PSL viewport]] * PSL viewport modification (viewport cover / tube / PSL box / periscope on the PSL table) * PSL table * Laser & SHG specs --- power, polarization, Xtals . '' - references'' . [1] G.D.Boyd and D.A. Kleinman, [http://jap.aip.org/japiau/v39/i8/p3597_s1 "Parametric interaction of Focused Gaussian Light Beams", J.A. Phys. 39, 3597 (1968)] . [2] C. Zhang, Y.Qin and Y.Zhu, [http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-33-7-720 "Perfect quasi-phase matching for the third-harmonic generation using focused Gaussian beams",Opt. Lett. 33, 720 (2008)] * Main optics specs (review) * Mode matching ([attachment:modematch_END.png mode matching at end table]) * Green generation . [attachment:manual_oven.pdf manual for the covesion oven] * Expected performance / noise / control system range * B) [[Upgrade 09/GreenLock/Electronics|Electronics]] |
Mode matching ([attachment:modematch_END.png mode matching at end table]) Green generation [attachment:manual_oven.pdf manual for the covesion oven] [[Upgrade 09/GreenLock/Electronics|Electronics]] |
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| * Digital servo / operation * Alignment (initial / fine / automatic) |
[[Upgrade 09/Purchase List/Green Locking|Purchase list]] [[Upgrade 09/GreenLock/Control Information|jump to Control Information]] [[Upgrade 09/GreenLock/Noise Requirement|jump to Noise Requirement]] |
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| . B) [[Upgrade 09/GreenLock/Control Information|jump to Control Information]] | = links = || ''' aLIGO ALS wiki ''' || http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation || || ''' Description of the optical / servo configuration ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888 LIGO DCC] || || ''' Servo modeling (!SimLink) ''' || [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ 40mSVN] || |
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| [[BR]] ------- == Links == . {i} [[Upgrade 09/GreenLock/Noise Requirement|jump to Noise Requirement]] . {i} aLIGO ALS wiki http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation . {i} Description of the optical / servo configuration [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888 LIGO DCC] . {i} Servo modeling (!SimLink) [https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ 40mSVN] . {i} [#TOP back to the page top] attachment:god_of_green.png |
Arm Length Stabilization using green laser beams
- attachment:god_of_green.png
Conceptual Design
- Optical Layout ([attachment:green_optics.png Table]/ In-vac)
ETM / end table
Mode matching ([attachment:modematch_END.png mode matching at end table]) Green generation [attachment:manual_oven.pdf manual for the covesion oven]
ITM wedge effect Purchase list jump to Control Information jump to Noise Requirement
links
aLIGO ALS wiki |
http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation |
Description of the optical / servo configuration |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888 LIGO DCC] |
Servo modeling (SimLink) |
[https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ 40mSVN] |