Differences between revisions 20 and 21

Arm Length Stabilization System

Wiki for ALS (Arm Length Stabilization; Auxiliary Lock System), a.k.a green lock system

Schematic (One Arm)

ALS Configuration

optical layout of PR2/SR2 chambers, POP/POS table
select AOM and AOM driver
fix green fiber specs, including how to do the laying
green fiber after EOM/AOM or before EOM/AOM
- Not much difference from noise, cable length point of view.
- Alignment jitter noise from AOM will be less if fiber comes after AOM. So, let it so.
fiber for PLL beat or not
where to put frequency offset: PLL or arm length
more detailed noisebudget
initial alignment planning
comm/diff servo topology
lock acquisition scheme

Broadband PD for PLL Newport 818-BB-21A (1.2 GHz bandwidth)
Resonant PD for green PDH JGW-D1201280
AOM and AOM driver (to be determined)
EOM: Qubig xxxxxx (ready)
- modulation frequencies are 32 MHz and 33 MHz JGW-T1605626
QPD for green beam pointing? (Use Oplev QPD?)
Picomotor mount? (ordered)

Fiber (under test at UToyama)
- probably with jacket, with endcap, without AR coating
- polarization maintaining
Fiber collimator (Tholabs PAF? Fixed focus collimator?)

-  ⇤ ← Revision 20 as of 2018-02-05 16:47:50 → 
  Size: 4129
  Editor: YutaMichimura
  Comment:
+   ← Revision 21 as of 2018-02-05 16:51:35 → ⇥
  Size: 4199
  Editor: YutaMichimura
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
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-= Arm Length Stabilization System (Green Lock System) =
+= Arm Length Stabilization System =
 Wiki for ALS (Arm Length Stabilization; Auxiliary Lock System), a.k.a green lock system