A Faraday isolator (FI) is a nonreciprocal optical device which transmits the linearly polarized light in one direction and deflects the backward beam. It usually consists of a Faraday rotator and two polarizers. The Faraday rotator is made of magneto-optical active material which is placed into the permanent magnet system (Nd-Fe-B). Two types of the magneto-optical active materials are available: Terbium-doped glass, Terbium-Gallium-Garnet (TGG) crystals.
The isolator protects a laser source by attenuating the reflected and backscattered light by several orders of magnitude (10^6 to 10^6). It is also used when some devices have extreme sensitivity to optical feedback which can cause intensity instabilities, frequency pulling and other undesirable effects.
We offer a variety of optical isolator models:
Highly transparent (HT) single-stage isolators. Isolation 38-44 dB, wavelength 400-1250 nm (fixed), clear aperture 2-15 mm. Transmission >90%. | |
Broadband isolators. Isolation >38 dB. Center wavelength - 800 nm (other designs are also available on request). Bandwidth - 120 nm (>30 dB). Clear aperture is 2-12 mm. HT and SE modifications are also available.
View transmission graph
View isolation graph | |
Tunable isolators. Peak isolation 38-42 dB. Default central wavelength - 780 nm. Tuning range from 710 to 880 nm. Other wavelengths available upon request. | |
Single stage isolators with side exit (SE). Isolation 38-44 dB, wavelength from 400 to 1250 nm (fixed), bandwidth - 30 nm. Clear aperture 2-12 mm. | |
Double stage isolators. Isolation >60 dB. Wavelength is 600 - 1150 nm (fixed). Bandwidth - 30 nm. Clear aperture 2-12 mm. | |
Please specify the desired clear aperture, isolator type (above) and wavelength with your enquiry. Please also specify the rod type (TGG or Glass).
TGG rods have higher breakdown threshold than Glass rods.
Typical isolator models and their specification are given in the
Key: AFR - rotator (without polarizers), AFI - isolator (with polarizers)?
