Differences between revisions 7 and 19 (spanning 12 versions)

Optical Lever (Room Temperature)

Related subgroups: VIS, IOO, MIF, VAC, CRY...

Contents

Optical Lever (Room Temperature)

Scope

Sensing local motions including longitudinal dof and all alignment dofs (pitch, yaw and roll) of any mirrors supported by vibration isolation system.

Note on the operating temperature: here the system is assumed to be utilized at room temperature, not in cryogenic temperature.

Applicable Documents

TBD; just see the links below.

General Description

Naming Conventions

TBD

Locations

BS chamber
ITM chambers (X,Y)
ETM chambers (X,Y)
PRC chambers (PRC, PR2, PR3)
SRC chambers (SRC, SR2, SR3)
MC chambers (MC1, MC2...)

Requirements

Sensor noise should be less than xxx.
Sensor's dynamic range should be greater than xxx.
At least horizontal degrees of freedom (X,Y)
Preferably a vertical sensor (Z) and side
The sensors have to be rigidly mounted on the ground so that these are useful for remembering the position of the mirror and recording the drifts.

Characteristics

Each optical lever consists of five parts: a light source, optical fibers, a focusing telescope, viewport windows, a detector, and pylons which support the focusing telescope and the detector.

Light source

For the light source, suggested candidates are

superluminous LED (SLED) or
laser light source as LIGO.

Optical Fibers

Optical fibers

Focusing Telescopes

Inspection plans

TBD

Procurement process and plans

TBD

Links

Some of the LIGO documents listed below are NOT public; to access them, you may need your own LSC account.

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-Sensing local motions including longitudinal dof and
+Sensing local motions including --(longitudinal dof and)--
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-<!> Here, the operating temperature is assumed to be at room temperature, not to be utilized in cryogenic temperature.
+<!> Note on the operating temperature: here the system is assumed to be utilized at room temperature, not in cryogenic temperature.
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+Line 15:
+TBD; just see the links below.
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-=== Receiver and Transmitter ===
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- * PRC chambers (dummyPRC, PR2, PR3)
 * SRC chambers (dummySRC, SR2, SR3)
+ * PRC chambers (PRC, PR2, PR3)
 * SRC chambers (SRC, SR2, SR3)
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+Line 33:
+ * At least horizontal degrees of freedom (X,Y) 
 * Preferably a vertical sensor (Z) and side 
 * The sensors have to be rigidly mounted on the ground so that these are useful for remembering the position of the mirror and recording the drifts.
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+Line 38:
-TBD
+Each optical lever consists of five parts: a light source, optical fibers, a focusing telescope, viewport windows, a detector, and pylons which support the focusing telescope and the detector.
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+Line 40:
+=== Light source ===
For the light source, suggested candidates are
 * superluminous LED (SLED) or
 * laser light source as LIGO.

=== Optical Fibers ===
Optical fibers

=== Focusing Telescopes ===
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+<<Anchor(Links)>>
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- * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=418|JGW-G1100418]]
+<!> Some of the LIGO documents listed below are '''NOT''' public; to access them, you may need your own LSC account.
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=22686|LIGO-M1000343, Advanced LIGO Review Committee Report: Test Mass Optical Lever FDR]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=15032|LIGO-T1000517, Optical levers Final Design Review for test masses, recycler mirrors and HAM optical benches]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=70690|LIGO-G1100961, Long-Term Stability Test for aLIGO Optical Levers]]
 * 
 * [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=418|JGW-G1100418, LCGT vacuum chamber envelope study]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=15271|LIGO-T1000533, Super-luminescent LED 21 and 50 day trend analysis]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=13338|LIGO-T1000390, Trade-off Study for the Optical Lever Light Source]]
 * [[https://dcc.ligo.org/cgi-bin/private/DocDB/ShowDocument?docid=11010|LIGO-T1000219, Test mass optical levers preliminary design]]