Differences between revisions 3 and 70 (spanning 67 versions)

Arm Length Stabilization by injecting green laser beams from the arm ends

BR BR

<<TableOfContents: execution failed [Argument "maxdepth" must be an integer value, not "[2]"] (see also the log)>>

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

Plan

time line

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

Development roadmap

End table arrangement
- NPRO placement / optical assembly at the end
- 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
- Relative f_noise between the PSL green and the Arm transmitted green
- ALS performance
Sophistication of the scheme
- Automatic handing off scripts
- Ready-to-go panels for AdvLIGO
- Automatic alignment of the green beam
- ---
- Green Michelson for precise ETM calibration
- Absolute length / mode spacing measurement by green

Detailed design

Design and Purchasing Lists
- Optical design / item list
- Electronics / control design / item list
- Purchase list
Detailed considerations
- Optical Layout ([attachment:green_optics.png Table]/ In-vac)
  - ETM / end table
  - ITM wedge effect
  - 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

jump to Control Information

Noise Requirements

jump to Noise Requirement

-  ⇤ ← Revision 3 as of 2009-08-25 00:24:44 → 
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  Editor: YoichiAso
  Comment:
+   ← Revision 70 as of 2010-04-27 22:41:57 → ⇥
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  Editor: KiwamuIzumi
  Comment:
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-= Green Laser Injection for Arm Pre-Lock =
+= Arm Length Stabilization by injecting green laser beams from the arm  ends =
[[BR]]
[[BR]]
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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.
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-== Basic Concept ==
+<<TableOfContents([2])>>
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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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+Line 9:
-=== Noise Sources ===
==== PLL phase noise ====
==== Phase noise from the cavity common mode motion ====
+{i} aLIGO ALS wiki    http://ilog.ligo-wa.caltech.edu:7285/advligo/Arm_Length_Stabilisation

-------

== 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)>>




=== Development roadmap ===
 * '''End table arrangement'''
  * NPRO placement / optical assembly at the end

  * 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

  * Relative f_noise between the PSL green and the Arm transmitted green
  * ALS performance
 * '''Sophistication of the scheme'''
  * Automatic handing off scripts

  * Ready-to-go panels for AdvLIGO
  * Automatic alignment of the green beam
  * ---
  * Green Michelson for precise ETM calibration

  * Absolute length / mode spacing measurement by green''' '''



== 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]]