High-precision measurement of effective focal length with single-mode fiber array

Pei Huang; James F. Howell

doi:10.1117/12.558796

14 October 2004 High-precision measurement of effective focal length with single-mode fiber array

Pei Huang, James F. Howell

Proceedings Volume 5523, Current Developments in Lens Design and Optical Engineering V; (2004) https://doi.org/10.1117/12.558796
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

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.

Citation Download Citation

Pei Huang and 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); https://doi.org/10.1117/12.558796

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