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| = Arm Length Stabilization by injecting green laser beams from the arm ends = <<TableOfContents([2])>> |
## page was renamed from Upgrade 09/GreenLock <<Anchor(TOP)>> |
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{i} aLIGO ALS wiki http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation ------- ------- == Plan == === time line === * [[Upgrade 09/GreenLock/timeline|time line]] describes where we are now and where we go. === 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_ETM_preliminary_design.png,Upgrade 09/GreenLock/Preliminary design for the end,height=200)>> |
. attachment:god_of_green.png |
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| === Development roadmap === * '''End table arrangement''' * NPRO placement / optical assembly at the end |
= Overview = |
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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 |
The diagrams below show a conceptual design of the green locking technique |
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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 |
<<ImageLink(green_vertex_preliminary_design.png,Upgrade 09/GreenLock/Preliminary design for the vertex,height=200)>> <<ImageLink(green_ETM_preliminary_design.png,Upgrade 09/GreenLock/Preliminary design for the end,height=200)>> |
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| * Ready-to-go panels for AdvLIGO * Automatic alignment of the green beam * --- * Green Michelson for precise ETM calibration |
= Plans = |
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| * Absolute length / mode spacing measurement by green''' ''' | || ''' long term plans ''' || ''' action item list ''' || [:Advanced_Techniques/Green_Locking/action_item_list] || ||<|3> ''' past plans ''' ||''' October 2010''' || [:Advanced_Techniques/Green_Locking/October_2010] || || ''' November 2010 '''||[:Advanced_Techniques/Green_Locking/November_2010] || ||'''January 2011''' || [:Advanced_Techniques/Green_Locking/January_2011] || [[BR]] = Developer's page = ||<:> ''''' Category ''''' ||<:> ''''' Links ''''' || ||''' Optical Layout '''|| (1) [attachment:green_optics.png Table layout] (2) [[Optical_Layout|In-vac layout]] (3) [[Optical_Tables|Pictures of Tables]] || || ''' Pictures of End tables ''' || [[ETMY_table|Picture of ETMY table]] / [[ETMX_table|Picture of ETMX table]]|| || ''' Lasers ''' || [[Advanced_Techniques/Green_Locking/Lasers|Lasers (specs, temp settings, etc.)]] || || ''' Optics ''' || [[Optical Layout#wedge|ITM wedge effect]] / [[Upgrade_09/Optics/RTmeasurement|Mirror RT measurement]]|| || ''' Mode matching ''' || ([attachment:modematch_END.png mode matching at end table]) || || ''' Electronics ''' || [:Advanced_Techniques/Green_Locking/Electronics]|| || ''' SHG ''' || [:Advanced_Techniques/Green_Locking/SHG] || || ''' Doubling Oven ''' || [attachment:PV40.pdf drawing of PV40 oven], [attachment:PVP2.pdf drawing of the base plate PVP2], [attachment:manual_oven.pdf manual for the covesion oven] || || ''' Servos ''' ||[[Advanced_Techniques/Green_Locking/Servos|Servos]] || || ''' Performance ''' ||[[Advanced_Techniques/Green_Locking/Noise Requirement|Noise Requirement]] || || ''' Purchase list ''' || [:Upgrade 09/Purchase List/Green Locking] || |
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| = Links = || ''' aLIGO ALS wiki ''' || http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation || || ''' Servo modeling (!SimLink) ''' || https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ || |
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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 == [[Upgrade 09/GreenLock/Control Information|jump to Control Information]] == Noise Requirements == [[Upgrade 09/GreenLock/Noise Requirement|jump to Noise Requirement]] |
= Documents = ||<:> ''''' Title ''''' ||<:> ''''' Locations ''''' || ''''' Notes ''''' || || ''' The 40m interferometer : prototyping aLIGO locking scheme ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=67127 G1100820-v1] || - || || ''' Description of the optical / servo configuration ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888 DCC?] || - || || ''' Arm Length Stabilization at the 40m prototype ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=39965 G1100301-v1]|| - || || ''' ALS at the 40m ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=38604 G1100127-v2] || - || || ''' Arm Length Stabilisation for Advanced LIGO ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=14040 G1000735-v1] || Experiment done by ANU team || || ''' Arm Length Stabilization for Advanced GW Detectors '''|| [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=3134 G0900577-v3] || - || || ''' Arm Length Stabilization VCO Noise requirements ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=13520 G1000703-v2] || - || || ''' Arm Length Stabilization (ALS): The Plan for Testing at The 40m ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=10002 G1000293-v1] || - || || ''' Advanced LIGO Arm Length Stabilization ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=1331 G0900215-v1] || || ''' Lock acquisition study for Advanced LIGO''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=12173 T1000294-v1] || - || || ''' Adv. LIGO Arm Length Stabilisation Design ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=1625 T0900144-v4] || -|| || ''' Adv. LIGO Arm Cavity Pre-Lock Acquisition System ''' || [https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=27983 T080139-x0] || comparison with other techniques || |
- attachment:god_of_green.png
Overview
- The diagrams below show a conceptual design of the green locking technique
Plans
long term plans |
action item list |
[:Advanced_Techniques/Green_Locking/action_item_list] |
past plans |
October 2010 |
[:Advanced_Techniques/Green_Locking/October_2010] |
November 2010 |
[:Advanced_Techniques/Green_Locking/November_2010] |
|
January 2011 |
[:Advanced_Techniques/Green_Locking/January_2011] |
Developer's page
Category |
Links |
Optical Layout |
(1) [attachment:green_optics.png Table layout] (2) In-vac layout (3) Pictures of Tables |
Pictures of End tables |
|
Lasers |
|
Optics |
|
Mode matching |
([attachment:modematch_END.png mode matching at end table]) |
Electronics |
[:Advanced_Techniques/Green_Locking/Electronics] |
SHG |
[:Advanced_Techniques/Green_Locking/SHG] |
Doubling Oven |
[attachment:PV40.pdf drawing of PV40 oven], [attachment:PVP2.pdf drawing of the base plate PVP2], [attachment:manual_oven.pdf manual for the covesion oven] |
Servos |
|
Performance |
|
Purchase list |
[:Upgrade 09/Purchase List/Green Locking] |
Links
aLIGO ALS wiki |
http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation |
Servo modeling (SimLink) |
https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ |
Documents
Title |
Locations |
Notes |
The 40m interferometer : prototyping aLIGO locking scheme |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=67127 G1100820-v1] |
- |
Description of the optical / servo configuration |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888 DCC?] |
- |
Arm Length Stabilization at the 40m prototype |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=39965 G1100301-v1] |
- |
ALS at the 40m |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=38604 G1100127-v2] |
- |
Arm Length Stabilisation for Advanced LIGO |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=14040 G1000735-v1] |
Experiment done by ANU team |
Arm Length Stabilization for Advanced GW Detectors |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=3134 G0900577-v3] |
- |
Arm Length Stabilization VCO Noise requirements |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=13520 G1000703-v2] |
- |
Arm Length Stabilization (ALS): The Plan for Testing at The 40m |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=10002 G1000293-v1] |
- |
Advanced LIGO Arm Length Stabilization |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=1331 G0900215-v1] |
|
Lock acquisition study for Advanced LIGO |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=12173 T1000294-v1] |
- |
Adv. LIGO Arm Length Stabilisation Design |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=1625 T0900144-v4] |
- |
Adv. LIGO Arm Cavity Pre-Lock Acquisition System |
[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=27983 T080139-x0] |
comparison with other techniques |