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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])>> [[BR]] {i} aLIGO ALS wiki http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation [[BR]] [[BR]] ------- == Plan == === time line === * [[Upgrade 09/GreenLock/timeline|time line]] describes where we are now and where we go. |
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| === 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] |
= Overview and Conceptual design = |
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==== 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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| === Development roadmap === * '''End table arrangement''' * NPRO placement / optical assembly at the end |
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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| * 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 |
Mode matching ([attachment:modematch_END.png mode matching at end table]) |
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| * 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''' ''' |
[[Upgrade 09/GreenLock/Electronics|Electronics]] [[Upgrade 09/GreenLock/Control Information|jump to Control Information]] |
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== 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''' * 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 * Digital servo / operation * Alignment (initial / fine / automatic) == Control information == . B) [[Upgrade 09/GreenLock/Control Information|jump to Control Information]] == Noise Requirements == . B) [[Upgrade 09/GreenLock/Noise Requirement|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] || || ''' manual for the doubling oven ''' || [attachment:manual_oven.pdf manual for the covesion oven] || || ''' noise requirements ''' ||[:Upgrade 09/GreenLock/Noise Requirement] || || ''' purchase list ''' || [[Upgrade 09/Purchase List/Green Locking|Purchase list]] || |
Arm Length Stabilization using green laser beams
- attachment:god_of_green.png
Overview and Conceptual design
- Optical Layout ([attachment:green_optics.png Table]/ In-vac) Mode matching ([attachment:modematch_END.png mode matching at end table])
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] |
manual for the doubling oven |
[attachment:manual_oven.pdf manual for the covesion oven] |
noise requirements |
[:Upgrade 09/GreenLock/Noise Requirement] |
purchase list |