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| = Arm Length Stabilization by injecting green laser beams from the arm ends = [[BR]] [[BR]] |
<<Anchor(TOP)>> = Arm Length Stabilization using green laser beams = . attachment:god_of_green.png |
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| <<TableOfContents([2])>> | * [[Upgrade 09/Purchase List/Green Locking|Purchase list]] |
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| [[BR]] {i} aLIGO ALS wiki http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation [[BR]] ------- == Plan == === time line === * [[Upgrade 09/GreenLock/timeline|time line]] describes where we are now and where we go. === Conceptual design === |
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==== Green Preliminary Design ==== |
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=== Development roadmap === * '''End table arrangement''' * NPRO placement / optical assembly at the end * SHG at the end table * Control system placement * Coarse alignment to the cavity * Fine alignment * Lock of the green beam to the cavity * '''At the PSL table''' * SHG at the PSL table * '''Digital control''' * Virtual Green lock by RCG * GPIB interfaces * '''Vertex tank optical arrangement''' * In-vac steering (PO transmission / Periscope / Mirrors) * Vertex phase noise measurement * Electronics placement * Control system implementation * '''Performance evaluation''' * f_noise of green beam / PDH performance * Relative f_noise between the PSL green and the Arm transmitted green * ALS performance * '''Sophistication of the scheme''' * Automatic handing off scripts * Ready-to-go panels for AdvLIGO * Automatic alignment of the green beam * --- * Green Michelson for precise ETM calibration * Absolute length / mode spacing measurement by green''' ''' == Detailed design == * '''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''' |
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| * 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)] |
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| . [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) |
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| * Expected performance / noise / control system range * Digital servo / operation * Alignment (initial / fine / automatic) |
* B) [[Upgrade 09/GreenLock/Electronics|Electronics]] |
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| . B) [[Upgrade 09/GreenLock/Control Information|jump to Control Information]] . {i} [[Upgrade 09/GreenLock/Noise Requirement|jump to Noise Requirement]] |
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| . {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] |
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| == Control information == . B) [[Upgrade 09/GreenLock/Control Information|jump to Control Information]] == Noise Requirements == . B) [[Upgrade 09/GreenLock/Noise Requirement|jump to Noise Requirement]] |
Arm Length Stabilization using green laser beams
- attachment:god_of_green.png
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]
- Optical Layout ([attachment:green_optics.png Table]/ In-vac)
- Mode matching ([attachment:modematch_END.png mode matching at end table])
- Green generation
- [attachment:manual_oven.pdf manual for the covesion oven]
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]
