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= Arm Length Stabilization using green laser beams =
[[BR]]		 ## page was renamed from Upgrade 09/GreenLock
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  . attachment:green_man.jpg
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   . We are developing a technique of Arm Length Stabilization (ALS) for advanced LIGO. The technique employs two auxiliary green lasers at each end of the arm. Basically these lasers are able to sense the displacement of the each arm independently on the main laser, eventually make full lock acquisition of advanced interferometer more robust and reliable.

[[BR]]
[[BR]]

<<TableOfContents([2])>>

[[BR]]


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== Designs and Plans ==
=== time line ===
 * The time line describes where we are now and where we go. B) [[Upgrade 09/GreenLock/timeline|time line]]


=== 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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= 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] ||
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== Installation status ==

 * '''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
  * B) [[Upgrade 09/GreenLock/Electronics|Electronics]]
 
  * Digital servo / operation
  * Alignment (initial / fine / automatic)		 = Developer's page =
 ||<:> ''''' Category ''''' ||<:> ''''' Links ''''' ||
 ||''' Optical Layout '''|| (1) [attachment:green_optics.png Table layout] (2) [[Optical_Layout|In-vac layout]] ||
 || ''' Pictures of End tables ''' || (1) [[ETMY_table|Picture of ETMY table]] (2) [[ETMX_table|Picture of ETMX table]]||
 || ''' Lasers ''' || [[Advanced_Techniques/Green_Locking/Lasers|Lasers (specs, temp settings, etc.)]] ||
 || ''' Optics ''' || (1) [[Optical Layout#wedge|ITM wedge effect]] (2) [[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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 . B) [[Upgrade 09/GreenLock/Control Information|jump to Control Information]] = 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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== Links ==
 . B) [[Upgrade 09/GreenLock/Noise Requirement|jump to Noise Requirement]]

 . {i} 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]		 = 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

    • green_vertex_preliminary_design.png green_ETM_preliminary_design.png

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]

BR

Developer's page

Links

Documents

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