Thorlabs also manufactures isolators for fiber optic systems and wavelengths from the visible to the infrared (see the Selection Guide table to the left). All isolators shown here (including the IO-D-780-VLP) have engravings that indicate the alignment of the input and output polarizers. The input and output apertures of the IO-D-780-VLP are indicated by the black and gold coloring of the cylinder, respectively. The housing of each isolator shown here, except for the IO-D-780-VLP, is marked with an arrow that indicates the direction of forward propagation. Please see the Isolator Types tab for additional design details and representative graphs of the wavelength-dependent isolation.

The third type, Tandem Adjustable Narrowband Isolators, consists of two Faraday rotators in series, boosting the isolation to at least 55 dB at the expense of lower transmission. The second type, Adjustable Narrowband Isolators, offers the user the ability to adjust the alignment of the input and output polarizers, allowing tuning of the center wavelength within a 30 - 40 nm range see the tables below for details. Any deviation from this wavelength will cause a dip in isolation and transmission. The first type, Fixed Narrowband Isolators, contains fixed, factory-aligned optics, for which peak isolation and peak transmission occurs at a pre-defined center wavelength. In the near infrared wavelength range, we offer three types of isolators. 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 is pleased to stock a variety of free-space optical isolators designed for use in the near infrared spectral range (690 - 1080 nm). Isolation at Center Wavelength from 34 to 60 dB.Isolator in Custom Package for FiberBench Systems Features

935 optical isolator