Abstract
Abstract
A stabilized delay optical path (DOP) toward absolute distance measurement is proposed based on the principle of optical balanced cross-correlation (OBCC). An OBCC signal is a subtraction from two-second harmonics generated by a periodically polarized crystal when the fundamental frequency pulses pass through periodically polarized crystal twice from the front and back. The steep slope of signal near the zero point is 67 mV nm−1 and is used to lock the fiber stretcher in the DOP by a servo controller. Thereby the purpose of stabilizing the DOP has been completed. The DOP is composed of a long fiber with two different applied lengths of ∼466 and ∼2000 m. The pulse numbers difference between delay and reference fibers are 227 and 978. The long-term repeatability of measurement deviations is 1.6 μm and 2.9 μm over 10 min, respectively. Therefore, this highly stabilized DOP can be considered as a stable device of the optical path.
Funder
National Natural Science Foundation of China
Research and Development Program of China
Subject
Applied Mathematics,Instrumentation,Engineering (miscellaneous)
Cited by
2 articles.
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