Arm Length Stabilization System (Green Lock System)

Configuration (One Arm)

To Do

• 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
• where to put frequency offset: PLL or arm length
• more detailed noisebudget
• initial alignment planning
• comm/diff servo topology
• lock acquisition scheme

List of Items

Electronics

• Common Mode Servo Board JGW-D1503705 (ready)

• PLL Board (similar to CMB, ordered to AEL)

• Phase Frequency Discriminator LIGO-D1002476 (prototype developed at UToyama)

• Fast version of IQ Demodulator LIGO-E1100044 (ordered to AEL)

• RF Oscillator for PDH Keysight N5181B MXG (ready)

• VCO for PLL Keysight E8663D (ready)

• Frequency counter (optional) Keysight 53220A?

Opto-electronics

• 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)

Optics

• Faraday isolator Thorlabs IO-5-532-HP (to be ordered)

• Periscopes Thorlabs Ø1.5inch Post Assembly (ready)

• Dichroic mirror: LEO DRX-1064/532-45P-UF-2038 (ready)
• Harmonic splitter: LEO LWP-45-R532-T1064-UF-2038 (ready)

Fiber optics

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

• Fiber layout JGW-G1707060

Drawings

• PSL table JGW-D1706335

• POP table

• PR2 in-vac JGW-G1706473

• TRX
• POS table
• SR2 in-vac
• TRY

Conceptual

• ALS configuration JGW-T1605353 (see Candidate4)

• Optical layout around PRs JGW-T1605261

• Optical layout around SRs JGW-T1605967

Noisebudget

• https://granite.phys.s.u-tokyo.ac.jp/svn/LCGT/trunk/kagranoisebudget/GreenLock

Documents

• Document tree for ALS JGW-E1807769