Abstract
Optical coherence tomography (OCT) based on a wave front division (WD) interferometer is demonstrated for the first time. Unlike a conventional amplitude division interferometer based OCT, WD OCT utilizes different wave front portions of the light source for sample and reference arm. Due to easy manipulation of the wavefront portions for sample and reference arm, it is feasible for WD OCT, provided that the source power of light is fixed, to optimize the ratio of light power for sample and reference arm to achieve both high power efficiency and high system sensitivity. The system sensitivity as a function of the ratio of light power directed to the two arms is experimentally studied and the result found to be well consistent with the theoretical analysis. In our current time-domain WD OCT, we have achieved the system sensitivity as high as 115 dB at a total source power of only 7.5 mW with 8% to the reference arm. Real-time WD OCT imaging of bio-tissues in vivo is also demonstrated.
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