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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|this]).
= Overview =

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

   [[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}}]]

= 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 '''|| (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]] ||
 || ''' Delay Line Freq. Descriminator ''' ||[[Advanced_Techniques/Green_Locking/DFD | DFD ]] ||


= 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 ''''' || ''''' 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)