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.

These among other Faraday media have the ability, when in an appropriate magnetic field, to rotate the plane of linearly polarised light by an amount proportional to its length. YIG crystal is used for wavelengths from 1100 to 2100nm. TGG is utilised in several free space optical isolators for wavelengths between 500 to 1100nm.

Based on a Faraday Rotator made of Terbium Gallium Garnet single crystals offer many features and flexible design and provide superior performance when used with diode lasers, and many other sources within their wavelength ranges. These models can be used at normal incidence as input faces are angled. All units are supplied with a mounting collar which permits easy mounting and accurate alignment to the polarisation plane of a laser.

Faraday Rotators

I-x-x-FR

45° rotation
A variety of wavelengths
2, 4 or 5mm clear aperture

Many optical isolators can be supplied without polarisers as a Faraday Rotator. These may then be use to rotate the polarisation of an optical beam through 45°. Faraday Rotators are all based on existing isolator models with the polarisers removed.

A list of the available wavelengths and clear apertures are shown with the relevant product code in the table.

Specifications

Specifications

Laser 2000 (uk) Ltd.

phone: +44 (0)1933 461 666
fax: +44 (0)1933 461 699

Laser Accessories