Narrowband adjustable isolators are applicable for gas, dye, semiconductor and solid-state lasers, etc. They can be tuned over the designated wavelength range. The adjustment mechanism moves the Faraday rotator rod in the axial hole in the magnet, thus controlling the length of the Faraday rod that is exposed to the magnetic field. Such isolators have peak isolation of 38-44 dB and center wavelength - 0.8 µm. Faraday rotation is directly proportional to the product of length times field (LxH). Normally, optical isolators are set for maximum isolation at defined centre wavelength. If the laser deviates from this wavelength, then the isolation will decrease. In order to regain maximum isolation, it is necessary to adjust the Isolator. Narrowband adjustable isolators can be re-tuned for wavelengths +/-5% away from this centre wavelength, to give no more than 3% reduction in isolation and transmission. This is achieved by rotating the output polarizer. Unless otherwise specified at time of order, these Isolators are set for horizontal input polarization. Output polarization is in the +/- 45° quadrant. The output polarization plane can be rotated to the horizontal or vertical with a polarization rotator.

With help of tables below You can choose for Your needs our stadard broadband isolator or specify Your special wishes. We offer narrowband adjustable isolators for waverange from 500 to 1250 nm.