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.

Tuneable Infrared Isolators

I-x-B-4H

1310, 1550 and 2100nm
Wide tuning range
Large 4mm clear aperture

The I-13-B-4H, I-15-B-4H and I-21-B-4H are adjustable to allow the user to tune to peak isolation if either temperature or wavelength vary. The tuning mechanism is designed to be immune to inadvertent detuning of the isolator. The 1310 and 1550nm models are available without a polariser as a Faraday rotator.

Specifications | Dimensions

Tunable Infrared Isolators

Laser 2000 (uk) Ltd.

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

Laser Accessories