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| = Green Laser Injection for Arm Pre-Lock = | ## page was renamed from Upgrade 09/GreenLock <<Anchor(TOP)>> |
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| We plan to install green lasers, which are phase locked to the PSL laser, at each end station to pre-lock the arm cavities before the lock acquisition. | . attachment:god_of_green.png |
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| == Basic Concept == | |
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| == Noise Requirement == I'd say the arm cavity length should not change more than 1/100 of the resonance width in the time scale of 10sec.[[BR]] For this to be fulfilled, the RMS fluctuation of the cavity length must be suppressed below 1e-11m level.[[BR]] Does this make sense ? |
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| === Noise Sources === ==== PLL phase noise ==== ==== Phase noise from the cavity common mode motion ==== When the cavity is locked to the green laser, the differential motion of the two mirrors will be suppressed by the servo. However, the common motion of the cavity mirrors will not be suppressed. This common motion will show up as phase noises of the lasers. The time derivative of phase noise is equivalent to frequency noise. The equivalent displacement noise seen by the cavity is dL=(w*x*L)/c, where w is the angular frequency, x is the displacement noise spectrum of the common motion, L is the length of the cavity and c is the speed of light (see [attachment:PhaseNoise.pdf] for derivation). |
= Overview = The diagrams below show a conceptual design of the green locking technique <<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)>> = Plans = ||<|3> ''' long term plans ''' || ''' action item list ''' || [:Upgrade 09/GreenLock/action_item_list] || ||- - - - || - - - - || ||- - - - || - - - - || ||<|3> ''' near term plans ''' ||'''January 2011''' || [:Upgrade 09/GreenLock/January_2011] || ||- - - - || - - - - || ||- - - - || - - - - || ||<|3> ''' past plans ''' ||''' October 2010''' || [:Upgrade 09/GreenLock/October_2010] || || ''' November 2010 '''||[:Upgrade 09/GreenLock/October_2010] || || - - - - || - - - - || [[BR]] = Developer's page = ||''' Optical Layout '''|| ([attachment:green_optics.png Table]/ In-vac) || || ''' end table ''' || [[Upgrade 09/GreenLock/end table|ETM / end table]] || || ''' end table ''' || <<ImageLink(endtable.jpg,Upgrade 09/GreenLock/end_table)>> || || ''' Lasers ''' || [[Advanced_Techniques/Green_Locking/Lasers|Lasers]] || || ''' Optics ''' || [[Optical Layout#wedge|ITM wedge effect]] || || ''' in-vac ''' || [[Upgrade 09/Optical Layout|Periscopes for beam steering from PR3/SR3 transmissions to the PSL viewport]] || || ''' Mode matching ''' || ([attachment:modematch_END.png mode matching at end table]) || || ''' Electronics ''' || [:Advanced_Techniques/Green_Locking/Electronics]|| || ''' sensing and control ''' || [:Upgrade 09/GreenLock/Control Information] || || ''' about the 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] || || ''' noise requirements ''' ||[:Advanced_Techniques/Green_Locking/Noise Requirement] || || ''' purchase list ''' || [:Upgrade 09/Purchase List/Green Locking] || = 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 || || ''' Servo modeling (!SimLink) ''' || https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ || = Documents = || DCC || || |
- 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 |
[:Upgrade 09/GreenLock/action_item_list] |
- - - - |
- - - - |
|
- - - - |
- - - - |
|
near term plans |
January 2011 |
[:Upgrade 09/GreenLock/January_2011] |
- - - - |
- - - - |
|
- - - - |
- - - - |
|
past plans |
October 2010 |
[:Upgrade 09/GreenLock/October_2010] |
November 2010 |
[:Upgrade 09/GreenLock/October_2010] |
|
- - - - |
- - - - |
Developer's page
Optical Layout |
([attachment:green_optics.png Table]/ In-vac) |
end table |
|
end table |
|
Lasers |
|
Optics |
|
in-vac |
Periscopes for beam steering from PR3/SR3 transmissions to the PSL viewport |
Mode matching |
([attachment:modematch_END.png mode matching at end table]) |
Electronics |
[:Advanced_Techniques/Green_Locking/Electronics] |
sensing and control |
[:Upgrade 09/GreenLock/Control Information] |
about the 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] |
noise requirements |
[:Advanced_Techniques/Green_Locking/Noise Requirement] |
purchase list |
[:Upgrade 09/Purchase List/Green Locking] |
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 |
Servo modeling (SimLink) |
https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ |
Documents
DCC |
|