Abstract

We proposed complex conjugate-free optical coherence tomography imaging method and demonstrated its performance on mirror image suppression operating in fiber-based interferometer. Artifact image given by twin peaks after the Fourier transform of real interferogram could be removed by using the Doppler shift induced by vibrations, which is utilized for the retrieval of complex signal. To induce the Doppler shift, in the experiment, piezoelectric transducer(PZT) was attached on coiled fiber in reference arm. With adjusting vibration conditions of the PZT, quantity of the phase shift obtained by the Doppler shift could be controlled in the fiber-based interferometer. With changing vibration frequencies, the performance of mirror image suppression was observed. Although small frequency changes of 15 Hz were adjusted, the complex conjugate-free results could be achieved easily. Because the proposed method could be easily adapted to the fiber-based interferometer, required phase control in fiber-based phase shifted interferometer or interferometer-based imaging system would be performed properly by simple implementation of vibration module.

© 2016 Optical Society of America