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= Green Laser Injection for Arm Pre-Lock = <<Anchor(TOP)>>
= Arm Length Stabilization using green laser beams =
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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 ==
== Noise Requirements ==
I'd say the arm cavity length should not change more than 1/100 of the resonance width in the time scale of 10sec.
For this to be fulfilled, the RMS change of the cavity length must be suppressed below 1e-11m level.
Does this make sense ?
  * [[Upgrade 09/Purchase List/Green Locking|Purchase list]]

 * 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]

   . <<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)>>



  * 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]]

  * Mode matching ([attachment:modematch_END.png mode matching at end table])
  * Green generation
   . [attachment:manual_oven.pdf manual for the covesion oven]
  * B) [[Upgrade 09/GreenLock/Electronics|Electronics]]
 
 

 . B) [[Upgrade 09/GreenLock/Control Information|jump to Control Information]]
 . {i} [[Upgrade 09/GreenLock/Noise Requirement|jump to Noise Requirement]]

 . {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]

 

Arm Length Stabilization using green laser beams

Advanced_Techniques/Green_Locking (last edited 2015-06-23 03:44:00 by EricquinteroATligoDOTorg)