Photodetectors
In-vac design considerations
Types
Name |
Schematics |
Description |
RF PD (List) |
For IR. Same schematic for both in-air and in-vac, but in different kind of box. |
|
DC PD |
For IR, in-air. |
|
RF QPD (List) |
For IR. Same schematic for both in-air and in-vac, but in different kind of box. |
|
DC QPD (List, Driver List) |
For IR, in-air (same as oplev QPD for now). |
|
RF PD for green |
For green, in-air (could be BB). |
|
DC PD for green |
For green, in-air (same for IR for now). |
|
DC QPD for green |
For green, in-air (same for IR for now). |
|
DC PD in vacuum |
For IR, in-vac. |
|
DC QPD in vacuum |
For IR, in-vac, bare QPD without amplifier. |
|
DC QPD in vacuum for green |
For green, in-vac, bare QPD without amplifier. |
List
See JGW-D1402986 for location of photodetectors. See this Google spreadsheet for list of photodetectors.
Modulation frequencies are listed in MIFIOOInterfaces.
- iKAGRA configuration (PMC: fPMC sideband / FRC: fIMC sideband / IMC: fIMC sideband, with ASC / 3-km MI: f1 sideband, without ASC / no ISS)
- bKAGRA configuration (PMC: fPMC sideband / FRC: fIMC sideband / IMC: fIMC sideband, with ASC / DRFPMI: f1,f2,f3 sidebands, with ASC / ALS: fALSX,fALSY sidebands, without ASC / with ISS)
For aLIGO, PD/QPDs below are in vacuum (see LIGO-T1000264).
- RF PDs for REFL, POP, AS
- RF QPDs for REFL, AS
- DC QPDs for MC2TRANS, POP, TRX, TRY, OMC (they don't have in air versions)