Fiber Ends, or Fiber Barrels/Micro Lenses:
For both enhancing fiber communications and for high-power fiber applications there has been a need to have the ends of fibers coated with special thin film coatings that enhance performance. Reynard has been able to serve the needs of both markets. Advancing telecommunication technologies is requiring the use of specialty fibers that couple with existing fiber networks. The index of refraction mismatch between fiber types causes loss of signal that could be detrimental to the communication channel. Reynard has worked with customers to coat the ends of fibers with index matched anti-reflection coatings, as well as coatings for special filtering of the signal. These coatings greatly reduce surface reflections to maintain a homogeneous signaling channel. Coatings have been developed that cover both the visible spectrum as well as the infrared spectrum.
Coupling the output of high power lasers into a fiber is a need for many industries, as it allows the laser to be directed to non-line-of-site areas or areas that are in constant motion. However, when the laser hits the end of the fiber, the index match between the fiber and the next medium, typically air, can damage the end of the fiber. Reynard has coated the ends of fiber optics with coatings that minimize the chance of damage to the fiber end interface.
When working with fiber, typically there is a protective coating or cladding around the fiber. To be compatible with a deposition process, this cladding must be vacuum compatible, in that it will not outgas when used in a vacuum environment. Reynard has experience coating bare fibers as well as fibers with vacuum compatible claddings.