Optical Delay Line for Rapid Scanning Low-Coherence Reflectometer
Keywords:
Biomedical imaging, interference, low-coherence reflectometer, rapid-scanning optical delay line, time-domain approach.Abstract
In this contribution we proposed and performed an optical delay line including all reflective components for long-range scanning without walk-off problem. The optical delay line is composed of a retro-reflector, an inclined reflection mirror and a scanning mirror. The size of the optical delay line is within 2 cm × 2 cm and the scanning range can reach 2.9 mm when the beam is incident at the pivot of the scanning mirror and the vibration angle of the scanning mirror is 9.6 degrees. The scanning range can be further increased when the pivot of the scanning mirror is laterally deviated from the incident beam. The optical delay line possesses the merits that it is compact, easy to fabricate and can perform rapid scanning in large scanning range without walk-off problem. The optical delay line
was showed with a low-coherence reflectometer where the scanning rate was 400 Hz. A higher scanning rate was achieved when a scanning component with higher scanning rate is applied.
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