Some applications do not require the
typically superior performance of OFR Isolators. In order to meet
these requirements, OFR has developed its new line of Utility Grade
Isolators, whose performance and prices are more modest.
Look for “C”
Utility grade Isolators contain the
letter “C” in the part number. Where models are available,
they are so listed throughout this catalog. For example, IO-5C-780-LP.
In some cases, “C” models might be somewhat larger than
the standard models.
Most OFR Isolators are available without
polarizers, in which case, terminate Part Number with “-I”
(see Price List).
Highest transmission, highest isolation, and highest
OFR Isolators typically have higher transmittance
and Isolation than all other isolators on the market. Further,
because of certain proprietary features (covered by 5 of OFR's
US patents), OFR Isolators are smaller and have higher performance
than any units of equivalent aperture available anywhere.
For visible to YAG laser Isolators, OFR's
Faraday Rotator crystal of choice is TGG (terbium-gallium- garnet),
which is unsurpassed in terms of optical quality, Verdet constant,
and resistance to high laser power. OFR TGG Isolator rods have been
damage tested to 22.5 J/cm2 at 1064 nm in 15 ns pulses (1.5 GW/cm2),
and to 20 kW/cm2 cw. However, OFR does not bear responsibility for
laser power damage that is attributable to "hot spots"
in the beam.
Other Faraday Rotator Materials
OFR produces more Isolator models covering more
laser wavelengths than any other manufacturer. These models utilize
numerous magneto-optic materials in addition to TGG, such as the
thin film bismuth-iron-garnet (BIG) and others, depending upon
wavelength, laser power, size requirement and other factors. Two
materials are covered by OFR patents (4,840,464 and 5,790,299).