Faraday isolator with 2.5 tesla magnet field for high power lasers

In this work the FI assembled under the traditional scheme and providing a 30 dB isolation ratio at 0.7 kW laser power is described. Such rather high Pmax is explained by two factors. The first factor is an increase of magnetic field. It shortens the magneto-optical element (MOE), but first imposes additional requirements to transverse homogeneity of the magnetic field. Second, an increase of H demands building-up a mass of magnets M and reinforces the mutual demagnetizing action of the neighboring magnets. Investigated FI can work at laser power up to 0.7 kW. Also the estimations, which allow expecting creation of isolator, assembled on the traditional scheme with one element for 1 kW average laser power are carried out.