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| Deletions are marked like this. | Additions are marked like this. |
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| * '''Measurement method''': Ring down, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9052, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9211, http://klog.icrr.u- tokyo.ac.jp/osl/?r=9496 | * '''Measurement method''': Ring down, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9052, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9211, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9496 |
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| * '''Measured''': | * '''Measured''': NOT YET MEASURED? :o |
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| * '''Design''': * '''Measured''': * '''Measurement method''': * '''Notes''': |
* '''Design''': 33.0 deg * '''Measured''': 31(1) deg * '''Measurement method''': Cavity scan with the inertia locking method http://klog.icrr.u-tokyo.ac.jp/osl/?r=9276 * '''Notes''': After PR2 was moved. |
| Line 122: | Line 122: |
| * '''Design''': * '''Measured''': * '''Measurement method''': |
* '''Design''': 35.0 * '''Measured''': 48(2) :o * '''Measurement method''': Cavity scan with the inertia locking method http://klog.icrr.u-tokyo.ac.jp/osl/?r=9246 |
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 Degraded?
- Mode-match
Measured:
Measurement method:
Notes:
Arm Cavities
- X-arm length
Design: 3000 m
Measured: 2999.990(2) m
Measurement method: Cavity scan FSR = 49.96557(4) kHz http://klog.icrr.u-tokyo.ac.jp/osl/?r=7332
Notes:
- X-arm Gouy phase
Design: 250.75 deg
Measured: 250.7(3) deg
Measurement method: Cavity scan TMS=34.79(5) kHz http://klog.icrr.u-tokyo.ac.jp/osl/?r=7332
Notes:
- X-arm finesse for IR
Design: 1530
Measured: 1410(30)
Measurement method: Ring down
Notes: There is temperature dependence due to frosting
https://klog.icrr.u-tokyo.ac.jp/osl/?r=10033
- X-arm round-trip loss
Design: 100 ppm
Measured: 86(3) ppm
Measurement method: From reflectivity change in locked and unlocked https://klog.icrr.u-tokyo.ac.jp/osl/?r=7307
Notes: The estimate might be wrong due to birefringence https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=11633
- X-arm mode-match
Measured: 91(1)%
Measurement method: Cavity scan https://klog.icrr.u-tokyo.ac.jp/osl/?r=7307
Notes:
- X-arm finesse for green
Design: 51
Measured: 41(2)
Measurement method: Calculated from reflectivity measurements by Hirose-san
Notes:
- Y-arm length
Design: 3000 m
Measured: 3000.015(1) m
Measurement method: Cavity scan, FSR = 49.96517(2) kHz https://klog.icrr.u-tokyo.ac.jp/osl/?r=9505
Notes:
- Y-arm Gouy phase
Design: 250.75 deg
Measured: 250.9(3) deg
Measurement method: Cavity scan, TMS = 34.82(5) kHz https://klog.icrr.u-tokyo.ac.jp/osl/?r=9505
Notes:
- Y-arm finesse for IR
Design: 1530
Measured: 1320(30)
Measurement method: Ring down, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9052, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9211, http://klog.icrr.u-tokyo.ac.jp/osl/?r=9496
Notes: There is temperature dependence due to frosting
https://klog.icrr.u-tokyo.ac.jp/osl/?r=10033
- Y-arm round-trip loss
Design: 100 ppm
Measured: NOT YET MEASURED?
Measurement method:
Notes:
- Y-arm mode-match
Measured: 87(2) %
Measurement method: Cavity scan https://klog.icrr.u-tokyo.ac.jp/osl/?r=9505
Notes:
- Y-arm finesse for green
Design: 51
Measured: 53(3)
Measurement method: Calculated from reflectivity measurements by Hirose-san
Notes:
Power Recycling Cavity
- PRX length
Design:
Measured:
Measurement method:
Notes:
- PRY length
Design:
Measured:
Measurement method:
Notes:
- PRC Gouy phase
Design: 33.0 deg
Measured: 31(1) deg
Measurement method: Cavity scan with the inertia locking method http://klog.icrr.u-tokyo.ac.jp/osl/?r=9276
Notes: After PR2 was moved.
Signal Recycling Cavity
- SRX length
Design:
Measured:
Measurement method:
Notes:
- SRY length
Design:
Measured:
Measurement method:
Notes:
- SRC Gouy phase
Design: 35.0
Measured: 48(2)
Measurement method: Cavity scan with the inertia locking method http://klog.icrr.u-tokyo.ac.jp/osl/?r=9246
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: