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	[attachment:green_optics.png Table] / In-vac
end table	Picture of ETMY table / Picture of ETMX table
Lasers	Lasers (specs, temp settings, etc.)
Optics	ITM wedge effect / 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]
Performance	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
Servo modeling (SimLink)	https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/

Documents

Title	Locations
Description of the optical / servo configuration	https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888
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]

-  ⇤ ← Revision 5 as of 2009-08-25 09:21:37 → 
  Size: 1218
  Editor: YoichiAso
  Comment:
+   ← Revision 143 as of 2011-09-23 06:24:55 → ⇥
  Size: 2632
  Editor: KiwamuIzumi
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-= Green Laser Injection for Arm Pre-Lock =
+## page was renamed from Upgrade 09/GreenLock
<<Anchor(TOP)>>
-Line 3:
+Line 4:
-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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+Line 7:
-== Basic Concept ==
-Line 7:
+Line 8:
-== 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 ?
-Line 12:
+Line 9:
-=== 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 =

|| ''' 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 '''|| [attachment:green_optics.png Table]  /   [[Optical_Layout|In-vac]] ||
|| ''' end table ''' || [[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] ||
|| ''' Performance ''' ||[[Advanced_Techniques/Green_Locking/Noise Requirement|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 ||
|| ''' Servo modeling (!SimLink) ''' || https://nodus.ligo.caltech.edu:30889/svn/trunk/docs/upgrade08/Green_Locking/Servo_modeling/ ||

= Documents =
||<:> ''''' Title ''''' ||<:> ''''' Locations ''''' ||
|| ''' Description of the optical / servo configuration ''' || https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=6888  ||
|| ''' 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]