Optical isolators are passive, non reciprocal devices that utilise the phenomenon of Magneto-Optic Rotation to isolate the source from reflections in an optical system. The heart of the device is based on a Faraday Rotator using, for example, Yttrium Iron Garnet-YIG (LPE and bulk) or Terbium Gallium Garnet-TGG single crystals.

Tuneable Optical Isolators

   I-56T-5 / I-67T-5 / I-80T-4
   I-80T-5 / I-98T-5 / I-106T-5

• 500 to 1090nm wavelengths
• Large 5mm clear aperture
• Isolation ≥40dB (typ)
• Insertion loss ≤0.6dB (typ)
• Medium or high power
• Easily tuned

These isolators are designed for use with any tuneable or single line source where wavelength changes are infrequent, but possible. These devices are adjusted by an easy to use and lockable mechanism to maximise performance for any specific wavelength or temperature. They can be factory optimised to the users wavelength and a scribe line is included to allow convenient return to this setting.

The 5 model range provides tuneable isolation over a 500nm range with individual units available between 500-600nm, 600-700nm, 700-900nm, 950-1030nm or 1040-1090nm. They offer high isolation of 35-40dB when tuned to any wavelength within these regions. All units feature a 5mm clear aperture (4mm clear aperture units are available for 780 to 850nm as model I-80T-4.)

There is a choice of medium or high power systems, with calcite Glan Taylor polarisers for medium power or calcite Glan Taylor polarisers with dual escape ports for higher power. Low power version are also available for the models I-80T-5, I-98T-5 and I-106T-5.

Faraday Rotator - Any unit may also be be supplied without polarisers and /or outer housing as a 45°±2° Faraday Rotator. All tuneability features are lost, since the device derives its tuneability through manipulation of the input polariser.