14 October 2004 High-precision measurement of effective focal length with single-mode fiber array
Author Affiliations +
We present a method for measuring an optical system’s effective focal length with a single mode fiber array and a wedge prism. Light emitted by the input fiber near the focal plane is collimated, reflected back in two angularly separated beams, and detected by the output fibers in the auto-collimation configuration. Measurement precision of a micron can be achieved due to the precision of fiber spacing and the position sensitivity of single-mode coupling. Absolute accuracy depends on factors such as optical design configuration, metrology, aberrations, and environmental control, and can be better than 10 micron. By varying input wavelength and field angle, this technique can be utilized to precisely characterize chromatic dispersion and distortion of the optics. Furthermore, because the technique only requires compact opto-mechanical accessories and electronic apparatus, it can be readily carried out on large optical systems in the field.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pei Huang, Pei Huang, James F. Howell, James F. Howell, } "High-precision measurement of effective focal length with single-mode fiber array", Proc. SPIE 5523, Current Developments in Lens Design and Optical Engineering V, (14 October 2004); doi: 10.1117/12.558796; https://doi.org/10.1117/12.558796


Taper Measurement Techniques
Proceedings of SPIE (April 01 1973)
Through pellicle coordinate metrology
Proceedings of SPIE (December 27 1996)
Mounting and alignment of IXO mirror segments
Proceedings of SPIE (July 29 2010)
Lens technology incorporating internal pan/tilt and zoom
Proceedings of SPIE (September 27 2008)

Back to Top