Alternative fiber-optic backreflectance sensor for measurement of the effective focal lengths of optical elements and distances |
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| Authors: | Ilko K Ilev Hiroshi Kumagai Koichi Toyoda Deepak Uttamchandani Brian Culshaw |
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| Institution: | (1) Laser Science Research Group, The Institute of Physical and Chemical Research (RIKEN), 2-1 Hirosawa, 351-01 Wako-shi, Saitama, Japan;(2) Optoelectronics Division, Department of Electrical Engineering, University of Strathclyde, 204 George Street, G1 1XW Glasgow, UK;(3) Present address: Institute of Applied Physics, Technical University of Sofia, BG-1156 Sofia, Bulgaria |
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| Abstract: | An alternative and simple fiber-optic backreflectance sensor method for accurate measurement of either effective focal lengths
of optical elements and short distances using a single-mode optical fiber and cw laser is presented. The method is based on
the intensity sensing of focused backreflectance laser emission and the spatial location of three specific points: the focal
point of the focusing optical element and two object points. The single-mode fiber is a key optical element and serves simultaneously
as a point laser source for testing, an object for projecting and a highly sensitive point receiver of the focused backreflectance
emission. The experimental and analytical results demonstrate the potential of the method for locating the spatial points
and determining the effective focal length with accuracies exceeding 1 μm and 0.5%, respectively, as well as for short distance
measurement with submicron accuracy. |
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| Keywords: | fiber-optic backreflectance sensor method single-mode fibereffective focal length distance |
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