We report the most recent advances of optical beamsplitters for laser communications developed at Barr Associates. The challenges for meeting the two key requirements, polarization control and wavefront control, of the lasercom beamsplitters are discussed. It is demonstrated that in order to meet the two key requirements, the repeatability of the refractive indices and the thickness of the coatings need to be controlled within 0.3% and 0.1% respectively from run to run, and the coating stress need to be controlled to less than 25 MPa. The latest result of various lasercom beamsplitters will be presented. For a typical 50% reflection and 50% transmission beamsplitter at 22.5 degree angle of incidence, the s and p polarization split is less than 0.2% from 1540nm to 1575nm and the surface flatness of the beamsplitter after coating is less than 1/40th waves peak to valley at 632.8nm.
The success of volume production of 200GHz and 100GHz spacing WDM band pass filters relies on several critical issues: (a) a robust, high tolerance design; (b) optimized machine configurations; (c) a stable and repeatable process; and (d) an accurate and reliable optical monitoring system. At Corning NetOptix, significant effort has been made to optimize the chamber and process parameters in order to control the optical performance, the reproducibility and the useful area. This results in increased production yields and excellent filter performance. The results of 200GHz and 100GHz spacing WDM filters manufactured at Corning NetOptix are presented.
The optical interference coatings that have been successfully used in the Chinese FY-1 Meteorological Satellite and airborne remote sensing instruments are described. The system requirements for these coatings, the design approach, fabrication techniques, and the results achieved are presented.
Optical interference coatings which have been successfully used in Chinese FY-1 Meteorological Satellite and airborne remote sensing instrument are described. These include system requirements for these coatings, design approach, fabrication technique, and the actual results achieved.
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