High-power Faraday isolators (FIs) for mid-IR radiation are of great practical importance, since they expand the capabilities of constructing optical schemes of solid state mid-IR lasers, which have progressed significantly in recent years. Isolators for high-power radiation with a wavelength of 1.5–2 m are especially important for the solid-state lasers in order to cover the entire mid-IR range. We developed the FI for high-power mid-IR radiation based on CVD-ZnSe polycrystals and studied its characteristics. The isolation of radiation with a wavelength of 1940 nm was demonstrated. No thermally induced depolarization effects were observed for radiation with a wavelength of 1940 nm up to 20 W. For studying the limitations of the isolator in terms of operating power, experiments with more powerful radiation at a wavelength of 1075 nm were performed. Estimates show the possibility of isolating radiation with a power of up to 200 W with the isolation ratio of the device of ∼25 dB. Ways to improve the device are discussed. The level of cold depolarization can be reduced, by annealing the magneto-optical elements. The device can be compactified by using a different optical isolation scheme and a different organization of the magnetic system. This path will also allow compensating thermally induced depolarization and, according to the estimates, will ensure the isolation of mid-IR radiation of a kilowatt power level.

用于中红外辐射的高功率法拉第隔离器（FI）具有极大的实际意义，因为它们扩展了构建固态中红外激光器光学方案的能力，近年来，这种技术已取得了长足的进步。波长为1.5–2的大功率辐射隔离器为了覆盖整个中红外范围，m对于固态激光器特别重要。我们开发了基于CVD-ZnSe多晶的高功率中红外辐射FI，并研究了其特性。证明了波长为1940 nm的辐射的隔离。对于2040 W以下的1940 nm波长的辐射，未观察到热诱导的去极化作用。为了研究隔离器在工作功率方面的局限性，我们进行了1075 nm波长的更强辐射实验。估算表明，可以隔离功率高达200 W的辐射，并且器件的隔离比约为25 dB。讨论了改善设备的方法。通过对磁光元件进行退火，可以降低冷去极化的程度。可以通过使用不同的光学隔离方案和不同的磁性系统结构来简化设备。该路径还将允许补偿热引起的去极化，并且根据估计，将确保隔离千瓦级功率的中红外辐射。