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= Arm Length Stabilization by injecting green laser beams from the arm ends =
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[[BR]]		 ## page was renamed from Upgrade 09/GreenLock
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   . We are developing a technique of Arm Length Stabilization (ASL) 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 help full lock acquisition of advanced interferometer.

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<<TableOfContents([2])>>

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{i} aLIGO ALS wiki http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation

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-------

== 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		    [[Upgrade 09/GreenLock/Preliminary design for the vertex|{{attachment:green_vertex_preliminary_design.png||height=200}}]]
   [[Upgrade 09/GreenLock/Preliminary design for the end|{{attachment:green_ETM_preliminary_design.png||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]] ||
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= 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]] ||
 || ''' 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 ==
 . B) [[Upgrade 09/GreenLock/Control Information|jump to Control Information]]


== Noise Requirements ==
  . B) [[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 ||

  • god_of_green.png

Overview

  • The diagrams below show a conceptual design of the green locking technique

    • Upgrade 09/GreenLock/Preliminary design for the vertex Upgrade 09/GreenLock/Preliminary design for the end

Plans


Developer's page

Links

Documents

  • Title

    Locations

    Notes

    The 40m interferometer : prototyping aLIGO locking scheme

    G1100820-v1

    -

    Description of the optical / servo configuration

    DCC?

    -

    Arm Length Stabilization at the 40m prototype

    G1100301-v1

    -

    ALS at the 40m

    G1100127-v2

    -

    Arm Length Stabilisation for Advanced LIGO

    G1000735-v1

    Experiment done by ANU team

    Arm Length Stabilization for Advanced GW Detectors

    G0900577-v3

    -

    Arm Length Stabilization VCO Noise requirements

    G1000703-v2

    -

    Arm Length Stabilization (ALS): The Plan for Testing at The 40m

    G1000293-v1

    -

    Advanced LIGO Arm Length Stabilization

    G0900215-v1

    Lock acquisition study for Advanced LIGO

    T1000294-v1

    -

    Adv. LIGO Arm Length Stabilisation Design

    T0900144-v4

    -

    Adv. LIGO Arm Cavity Pre-Lock Acquisition System

    T080139-x0

    comparison with other techniques

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