It is demonstrated experimentally that at high average radiation power, the
optical isolation in the recently proposed design of a Faraday isolator is
substantially higher than in the conventional scheme. The Faraday isolator
with the isolation of 45 dB at the radiation power of 100 W is implemented
. The data obtained show that a 30-dB isolator for the average laser radiat
ion power of 1 kW can be realised.