Participant: Eleonora, Marco, Yuhang and Matteo

Input beam: waist of 192e-6 m at a distance -0.2 m from the laser head. Characterized here.

The input power is 232mW. After put two waveplates, the power becomes 228mW.

Telescope

First lens (f = 50) at a distance 13.5 cm from the laser head.

after the lens we measured  a beam with a  waist  of  33.6e-6 m at z = 0.188 m from the laser head

Second lens (f=175) at a distance 39 cm from the laser head.

after putting the second lens, we adjust it and make it collimated. The beam diameter now is 3800e-6m.

Faraday isolator: input power 227mW output power: 202 mW  Throughput 89%

Semireflective mirror: input: 180 mW  reflection: 174 mW trransmission 2.7 mW

Fiber collimator: input power 2.6 mW output power 2* 0.88 mW.  Power coupled 68%