The FH series Fiber Optic Focus Heads are single element optical assemblies designed focus the output beam from Silica Fiber to a spot. Typical Silica fiber with an NA of 0.22 produces an output beam with divergense of approx +/-12.7 deg. Seperate optics are optimized for the UV/VIS spectrum and the VIS/NIR the optical spectrum. The FH Focus Heads are designed to be used with an FOC Collimator.