They contain a Faraday rotator that has been factory tuned to rotate light of the design wavelength by 45°. Thorlabs' Adjustable Narrowband Isolators are designed to provide the same peak isolation anywhere within a 45 nm tuning range. Operating Principles of Optical Isolators Light at the Design Wavelength is Rejected Thorlabs' in-house manufacturing service has over 25 years of experience and can deliver a free-space isolator tuned to your center wavelength from 244 nm to 4.55 µm. If Thorlabs does not stock an isolator suited for your application, please refer to the Custom Isolators tab for information on our build-to-order options, or contact Tech Support. As indicated in the tables below and pictured to the right, many of our stock isolators can also be provided in a mount designed for our FiberBench systems. Thorlabs also manufactures free-space and fiber-optic isolators for wavelengths from the UV to the infrared (see the Selection Guide table to the left). All isolators shown here (including the IO-D-1064-VLP) have engravings that indicate the alignment of the input and output polarizers. The input and output apertures of the IO-D-1064-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-1064-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 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 45 nm range. 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. Please see the Isolator Tutorial tab for an explanation of the operating principles of a Faraday isolator.įor applications at Nd:YAG wavelengths, we offer three types of isolators. 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 with Nd:YAG lasers (i.e., output at the fundamental wavelength of 1064 nm). Max Beam Diameter from Ø1.6 mm to Ø9 mm.Isolation at Center Wavelength from 25 to 55 dB.IO-3-1064-HP Isolator Shown in Included SM1RC Saddle and Mounted to an Optical Table Using a BA1 Base and SD1 1/4"-20 to 8-32 Counterbore Adapter Features
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