The all new FP4-COL-1550 Fiber Adapter Core collimates the laser beam from a fiber tip so that the beam does not overfill the active area of the 818 and 918D series IR and IG detectors.  It employs a 1.8 mm diameter graded index lens with an AR coating between 1250 to 1650 nm.  This part is inserted into the FP4 series fiber adapters such as FP4-FC, FP4-ST, FP4-SC, and FP4-LC.  The rubber gasket around the part ensures a secure placement of the collimator inside the fiber adapter, however, bolt it to the adapter for consistent measurements.  The coating is optimized for the telecommunication wavelengths at around 1310 and 1550 nm.  Typical insertion loss is better than 0.2 dB.  Two 2-56 screws are included to provide handling convenience, and two 0-80 screws are included to allow tightening FP4-COL-1550 onto the fiber adapters.  Note that the power reading is no longer calibrated, due to the loss through the lens.  It replaces the obsolete FP4-CORE-IR.   


全新的fp4 - coll -1550光纤适配器核心将激光束从光纤尖端对准，这样光束就不会超过818和918D系列红外和IG探测器的活跃区域。它采用了1.8毫米直径的梯度折射率透镜，在1250到1650纳米之间有一层AR涂层。该部分插入FP4系列光纤适配器中，如FP4- fc、FP4- st、FP4- sc和FP4- lc。该部分的橡胶垫圈确保了准直器在光纤适配器内的安全位置，然而，螺栓它到适配器一致的测量。该涂层在1310和1550 nm左右对通信波长进行了优化。典型的插入损耗优于0.2 dB。两个2-56螺丝被包括提供处理方便，两个0-80螺丝被包括允许拧紧fp4 - col1550光纤适配器。注意，由于镜片的损耗，功率读数不再校准。它替换了过时的FP4-CORE-IR。