[問題] faraday rotator (optical isolator)的架設方式
請問有人知道faraday rotator的架設方式嗎
我在架設這個光學儀器時 發現一些問題
不知道是不是我的方法有錯 基本上我都是照著Thorlabs網站上的方法操作的
以下為架設方式 共分兩部份
Initial Alignment 第一部份
1.Remove the protective tape from the polarizer cells.
2.Place the isolator in the laser beam. Place a detector >8" from the
output polarizer. Center the beam.
3.Loosen the setscrews on the polarizer cells.
4.Rotate the input polarizer until transmission is maximized,
thus aligning it to the laser’s plane of polarization.
Lock down its setscrew.
5.Rotate the output polarizer until transmission is maximized.
This occurs nominally at 45° CW or CCW, depending on the model,
relative to the input plane of polarization.
基本上第一部份就只是單純把穿透率對到最大而已
Fine Tuning to Optimize Isolation 第二部份
1.Reverse the isolator, so the output polarizer faces the laser and
the detector is a few inches from the input polarizer. Center the beam.
2.Adjust the output polarizer, now facing the laser, by 1° to 2°
until transmission is minimized.
3.Lock down its setscrew.
4.Return the isolator to the operating position and center the beam.
第二部份則是要測試isolator是否能真正有效的擋住反射光
而我的問題也是發生在第二部份 我在進入isolator之前的雷射光power約為 34.4mW
而根據第一部份的操作 我使其穿透率達到92.7% 但在操作第二部份時
發現好像沒辦法很有效的擋掉反射光 我將isolaor反轉後
發現竟然有高達6.38 mW的雷射光穿透過isolator
我換了另一個isolator再做同樣的操作似乎也是一樣
而我的isolator是30dB的(即會將反射光衰減1000倍) 6.38mW還是太大了
請問是不是有可能是我哪個環節操作錯誤呢?
附上Thorlabs有關isolator介紹的網址 http://0rz.tw/Gj0fK
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