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.

Broadband Optical Isolators

I-5060C / I-6070C I-7090C / I-9010C

5mm clear aperture
Isolation ≥32dB (typ)
Insertion loss ≤1.5dB (typ)
Medium or high power
Wide instantaneous bandwidth
No tuning required

Broadband devices offer a high isolation of 30-35dB with typical centre isolation of ≥40dB. Models are available for most wavelengths between 500-1030nm. All units feature a wide 5mm clear aperture.

These isolators are designed for use with many tuneable, multi-line or multiple sources such as Diode, Ti:Sapphire and Dye Lasers where isolator adjustments might be inconvenient or impossible. Although no tuning is required, these devices can be adjusted by an easy-to-use and lockable mechanism to maximise performance, when necessary, for a specific wavelength and/or ambient temperature. Also included is a convenient return to factory setting capability.

Power Density
Broadband isolators are all available as medium or high power units.

Specifications | Dimensions

Broadband Optical Isolators

Laser 2000 (uk) Ltd.

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

Laser Accessories