Check the listing for details. OFR IO-D-λ "Aspirin Tablet" Micro Optical Isolator NIR 1.34um-Free Shipment. Condition: New – Open box. Listed at 99.00 USD. This is an OFR "Aspirin Tablet" type fixed wavelength micro faraday optical isolator for NIR 1.34um lasers. Parts come direct from OEM spare or engineering stock. Components comes with OEM optics fixture to fit inside an optics assembly. Part is typically used within NIR laser system optics train to avoid reflections from processing surface to penetrate back into the laser resonator. From the original manufactured website "OFR isolators are used to reduce or eliminate the effects of optical feedback...reflections of the laser's own energy back into itself. The effects of optical feedback are well known: amplitude fluctuation, frequency shift, limitation of modulation bandwidth, noise and even damage. Much like a diode in an electrical circuit, the isolator transmits light in one direction only. An isolator consists of a Faraday rotator, two polarizers and a body to house the parts. The Faraday rotator consists of a magneto-optic material contained in a magnetic field." Specs: Diameter: 5.5 mm Length: 4.0 mm Aperture: 1.75 mm Fixture diameter: 22.5 mm Payment: Paypal Only Shipment: Shipment will be completed within 1 business day once full payment is confirmed. Shipment is included for customers located in the continental United States. We also accept worldwide shipments, but customers outside the US should contact us prior to complete payment so we can provide you with the most reasonable fare. We will need a phone number to complete international shipment documentation. We can also use a customer's UPS, FEDEX or DHL account upon request. Local pick up comes at at no charge. Return/Warranty: We offer 30 day return on this part only if it is visibly damaged, cracked during shipment. Returned parts will be inspected for laser damage. Part was pristine when it was shipped, returned parts with laser damage will no longer be eligible for refund. No additional warranty is offered, part is sold "As Is". We thank you for your business and comprehension.