In addition, all isolators have engravings that indicate the alignment of the input and output polarizers. Please see the Isolator Types tab for additional design details and representative graphs of the wavelength-dependent isolation.Įach isolator's housing is marked with an arrow that indicates the direction of forward propagation. They also offer the user the ability to adjust the alignment of the output polarizer with respect to the input polarizer, allowing the peak of the isolation curve to lie anywhere within a 50 - 200 nm range see the tables below for details. These isolators are factory aligned to provide peak isolation at the specified center wavelength. Isolators can be mounted close to the breadboard surface. Please see the Isolator Tutorial tab for an explanation of the operating principles of a Faraday isolator. In addition, intense back-reflected light can permanently damage optics. Back reflections can create a number of instabilities in light sources, including intensity noise, frequency shifts, mode hopping, and loss of mode lock. Optical isolators, also known as Faraday isolators, are magneto-optic devices that preferentially transmit light along a single direction, shielding upstream optics from back reflections. Thorlabs' Free-Space Adjustable Narrowband MIR Optical Isolators offer operating ranges that span 2.20 - 4.55 µm and are designed for use in the MIR spectral range.
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