Single-stage isolators providing an extinction ratio of > 30 dB are sufficient for most applications including fiber coupling or resonator alignment. For high-power lasers and optical amplifiers however, a double-stage isolator with reverse isolation > 60 dB has to be used. These are two Isolators in tandem on a common base, sharing a common center Polarizer. Isolation is doubled and transmittance is reduced to approximately the squared value. Net rotation can be ordered to be 0° or 90°. All surfaces are AR-coated for maximum transmittance.

We can fine-tune the isolators to provide maximum transmission (> 90% per stage) and at the same time maximum extinction at any wavelength in region 0.8- 1.15 µm. Available clear apertures are between 3 and 12 mm. Double Stage Isolators have output polarization in the same plane as the input, or optionally at 90°.

With help of tables below You can choose for Your needs one of our stadard isolator constructions or specify Your special wishes.