= 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 [[https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=8214&version=14|here]].