The near-infrared collimator,with ultra-diffraction limit plane wave and uniform light intensity distribution,plays an important role in the adjustment of near-infrared optical systems and the measurement of detector response uniformity.Using infrared laser exported by a single-mode fiber as the light source,some key technologies are discussed in this paper,including the calculation of collimating lens′ focal length,the selection of collimating lens,the stray light influence on the uniformity of...