Differences between revisions 5 and 7 (spanning 2 versions)

Optical Characterization

This page is intended for summarizing the interferometer optical characterization results and discussions. See following pages and documents for iKAGRA and bKAGRA Phase-1 characterization summary:

See following pages for some design parameters

RF Sidebands

f1 frequency
f2 frequency
f1 modulation depth
f2 modulation depth

Input Mode Cleaner

Round-trip length
- Design: 53.28708 m (FSR of 5.6269873 MHz)
- Measured: 53.302985(9) m
- Measurement method: FSR was measured to be 5.624308(1) MHz. https://klog.icrr.u-tokyo.ac.jp/osl/?r=4831
- Notes: Measured on April 2018. Any re-installation after this?
Finesse
- Design: ~500
- Measured: 409
- Measurement method: Cavity pole was measured to be 6.86(2) kHz. https://klog.icrr.u-tokyo.ac.jp/osl/?r=14569
- Notes: Lower than iKAGRA measurement of 540+/-70 http://klog.icrr.u-tokyo.ac.jp/osl/?r=618
Mode-matching
- Measured:
- Measurement method:
- Notes:

Arm Cavities

X-arm length
- Design:
- Measured:
- Measurement method:
- Notes:
X-arm finesse for IR
- Design:
- Measured:
- Measurement method:
- Notes:
X-arm round-trip loss
- Design:
- Measured:
- Measurement method:
- Notes:
X-arm mode-matching
- Measured:
- Measurement method:
- Notes:
X-arm finesse for green
- Design:
- Measured:
- Measurement method:
- Notes:
Y-arm length
- Design:
- Measured:
- Measurement method:
- Notes:
Y-arm finesse for IR
- Design:
- Measured:
- Measurement method:
- Notes:
Y-arm round-trip loss
- Design:
- Measured:
- Measurement method:
- Notes:
Y-arm mode-matching
- Measured:
- Measurement method:
- Notes:
Y-arm finesse for green
- Design:
- Measured:
- Measurement method:
- Notes:

Power Recycling Cavity

PRX length
- Design:
- Measured:
- Measurement method:
- Notes:
PRY length
- Design:
- Measured:
- Measurement method:
- Notes:
PRC Gouy phase
- Design:
- Measured:
- Measurement method:
- Notes:

Signal Recycling Cavity

SRX length
- Design:
- Measured:
- Measurement method:
- Notes:
SRY length
- Design:
- Measured:
- Measurement method:
- Notes:
SRC Gouy phase
- Design:
- Measured:
- Measurement method:
- Notes:

Michelson

Schnupp asymmetry
- Design:
- Measured:
- Measurement method:
- Notes:

Dual Recycled Michelson

Power recycling gain
- Design:
- Measured:
- Measurement method:
- Notes:

Power Recycled Fabry-Perot Michelson

Power recycling gain
- Design:
- Measured:
- Measurement method:
- Notes:
Power at each ISC detection ports when locked
- REFL:
- POP p-pol:
- POP s-pol:
- POS p-pol:
- POS s-pol:
- AS RF:
- OMC REFL:
- OMC TRANS:
- TRX:
- TRY:

Output Mode Cleaner

Round-trip length
- Design:
- Measured:
- Measurement method:
- Notes:
Finesse
- Design:
- Measured:
- Measurement method:
- Notes:

KAGRA/Subgroups/MIF/OpticalCharacterization (last edited 2021-08-11 16:03:32 by YutaMichimura)

-  ⇤ ← Revision 5 as of 2021-02-26 22:02:55 → 
  Size: 3288
  Editor: YutaMichimura
  Comment:
+   ← Revision 7 as of 2021-02-26 22:19:07 → ⇥
  Size: 4156
  Editor: YutaMichimura
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 19:
-  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
+  * '''Design''':   53.28708 m (FSR of 5.6269873 MHz)
  * '''Measured''': 53.302985(9) m B)
  * '''Measurement method''': FSR was measured to be 5.624308(1) MHz. https://klog.icrr.u-tokyo.ac.jp/osl/?r=4831
  * '''Notes''': Measured on April 2018. Any re-installation after this?
 Line 24:
-  * '''Design''':
+  * '''Design''': ~500
  * '''Measured''': 409
  * '''Measurement method''': Cavity pole was measured to be 6.86(2) kHz. https://klog.icrr.u-tokyo.ac.jp/osl/?r=14569
  * '''Notes''': Lower than iKAGRA measurement of 540+/-70 http://klog.icrr.u-tokyo.ac.jp/osl/?r=618
 * Mode-matching
-Line 42:
+Line 46:
+  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * X-arm mode-matching
-Line 65:
+Line 73:
+ * Y-arm mode-matching
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
-Line 82:
+Line 94:
+ * PRC Gouy phase
  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
-Line 90:
+Line 107:
+  * '''Design''':
  * '''Measured''':
  * '''Measurement method''':
  * '''Notes''':
 * SRC Gouy phase