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How to Align an Optical Isolator | Thorlabs Insights

Align a Faraday isolator ensures optimal transmission of optical power from the source, as well as effective suppression of reflections traveling back towards the source. Alignment is demonstrated using a polarization-dependent free-space optical isolator with a 510 nm to 550 nm operating range, a post collar that assists with alignment, a linearly polarized and collimated 520 nm laser, a silicon power sensor, and a power meter. These optical isolators output linearly polarized light and provide best performance when the input beam is linearly polarized. Always follow your institution's laser safety guidelines. Unlike the low-power source used in this demonstration, other laser sources may be damaged by back reflections. Many stray reflections, which can endanger colleagues and the laser, can be avoided by blocking the laser beam when it is not needed. 0:00 Introduction 0:40 Design and Purpose of the Beam Reducer 1:00 Initial Alignment and the Use of the Post Collar 1:42 Rotating the Input Polarizer 2:21 Tuning the Output Polarizer 3:04 Final Alignment Components used in this demonstration include: - IO-3-532-LP Polarization-Dependent Free-Space Isolator: https://www.thorlabs.com/newgrouppage... - R2T post collar: https://www.thorlabs.com/newgrouppage... - PL201 Collimated Laser Module: https://www.thorlabs.com/newgrouppage... - S120C Optical Power Sensor: https://www.thorlabs.com/newgrouppage... - PM400 Optical Power Meter: https://www.thorlabs.com/newgrouppage... - Balldrivers and Hex Keys: https://www.thorlabs.com/newgrouppage... For more photonics how-to videos, visit https://www.thorlabs.com/newgrouppage....