to protect a laser source from back-reflection
Faraday Isolators are used to protect laser sources from back-reflection (optical diode), which can cause mode hopping, laser noise, frequency instability and a shorter laser lifetime.
Protection of the laser source
If light is back-reflected into the laser source, it causes mode hopping. While the undisturbed typical laser source shows a single mode in the spectrum, the disturbed spectrum shows multiple excited modes that change stochastically over time. This mode hopping results in laser noise, frequency instability and ultimately causes the laser lifetime to be decreased significantly.
Please note that because of its working principle the polarization of the beam passed by the Faraday isolator is rotated by 45° degrees in comparision with the input polarization.
| Order Code | Center Wavelength | Band Width | Aperture | Isolation | Insertion loss |
|---|---|---|---|---|---|
| 48FI-5-400 | 400 nm | 15 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-2-532 | 532 nm | 20 nm | 2 mm | > 30 dB | < 0.5 dB |
| 48FI-5-532 | 532 nm | 20 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-2-633 | 633 nm | 20 nm | 2 mm | > 30 dB | < 0.5 dB |
| 48FI-5-633 | 633 nm | 20 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-5-660 | 660 nm | 25 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-5-670 | 670 nm | 20 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-5-780 | 780 nm | 20 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-5-810 | 810 nm | 10 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-5-850 | 850 nm | 20 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-5-980 | 980 nm | 10 nm | 5 mm | > 30 dB | < 0.5 dB |
| 48FI-5-1064 | 1064 nm | 10 nm | 3 mm | > 30 dB | < 0.5 dB |
| 48FI-5-1080 | 1080 nm | 10 nm | 5 mm | > 30 dB | < 0.5 dB |
