Abstract
A high-accuracy optical distance meter with a mode-locked
femtosecond laser is proposed for distance measurements in a 310-m-long
optical tunnel. We measured the phase shift of the optical beat
component between longitudinal modes of a mode-locked laser. A high
resolution of 50 µm at 240-m distance was obtained without
cyclic error correction. The group refractive index of air is
automatically extracted to an accuracy of 6 parts per million (ppm)
by two-color measurement with the pulses of fundamental and
second-harmonic wavelengths. Finally, an absolute mechanical
distance of 240 m was obtained to within 8-ppm accuracy by use of
a series of beat frequencies with the advantage of a wide range of
intermode frequency, together with the results of the two-color
measurement.
© 2000 Optical Society of America
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