Output Faraday isolator
Requirement
Transmittance > 90% for the first phase, 97% for the second phase
Isolation ratio > 25dB for the first phase, 35dB for the second phase
Optical Design (updated 19/7/10)
item |
diameter |
thickness |
refraction index |
AR reflectivity |
misc |
OFR |
12mm |
unknown |
1.95 |
unknown |
T>98% |
QR1 |
25.4mm |
14.2mm |
1.45 |
<2000ppm |
90deg pol rotation |
QR2 |
25.4mm |
7.13mm |
1.45 |
<2000ppm |
45deg pol rotation |
PBS1/2 |
25.4mm |
6.35mm |
1.45 |
unknown |
Tp>98%, Ts<0.1%, extinction ratio>5000:1 |
Tp of PBS comes from the value with +/- 2 deg error in AOI. The value at a right AOI is Tp>99.4% and Ts<0.05%.
- Refractive indices of QR and PBS are nominal values for quartz and fused silica.
- In the ray trace calculation, the OFR thickness is set to 10mm.
Space |
Distance |
AOI |
QR1-PBS1 |
62.2mm |
56deg |
PBS1-OFR |
99.6mm |
0deg |
OFR-QR2 |
28.5m |
0deg |
QR2-PBS2 |
63.4m |
-56deg |
- The distance is from the second surface of the first item to the first surface of the second item.
Measured result
Transmittance |
95% |
|
Isolation ratio |
28dB |
AR reflection could not be perfectly removed at the measurement so it may be higher in reality. |
See here.