Compact optical delay line for long-range scanning |
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| Authors: | Chia-Yun Kao Kitsakorn Locharoenrat Max Ti-Kuang Hou |
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| Institution: | a Department of Physics, Chung Yuan Christian University, Chungli 32023, Taiwanb Institute of Micro-Electro-Mechanical System, National Tsing Hua University, Hsinchu 30043, Taiwanc Department of Mechanical Engineering, National United University, Miaoli 36003, Taiwan |
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| Abstract: | We proposed and demonstrated an optical delay line composed of all reflective components for long-range scanning without walk-off problem. The optical delay line consists 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°. 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 advantages 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 demonstrated with a low-coherence reflectometer where the scanning rate was 400 Hz. A higher scanning rate can be achieved when a scanning component with higher scanning rate is applied. |
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| Keywords: | Rapid-scanning optical delay line Low-coherence reflectometer Biomedical imaging Time-domain approach Interference |
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