20 February 2014 Cost-effective optical coherence tomography spectrometer based on a tilted fiber Bragg grating
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A compact, fiber-based spectrometer for biomedical application utilizing a tilted fiber Bragg grating (TFBG) as integrated dispersive element is demonstrated. Based on a 45° UV-written PS750 TFBG a refractive spectrometer with 2.06 radiant/μm dispersion and a numerical aperture of 0.1 was set up and tested as integrated detector for an optical coherence tomography (OCT) system. Featuring a 23 mm long active region at the fiber the spectrum is projected via a cylindrical lens for vertical beam collimation and focused by an achromatic doublet onto the detector array. Covering 740 nm to 860 nm the spectrometer was optically connected to a broadband white light interferometer and a wide field scan head and electronically to an acquisition and control computer. Tomograms of ophthalmic and dermal samples obtained by the frequency domain OCT-system were obtained achieving 2.84 μm axial and 7.6 μm lateral resolution.
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Stefan Remund, Stefan Remund, Anke Bossen, Anke Bossen, Xianfeng Chen, Xianfeng Chen, Ling Wang, Ling Wang, Adedotun Adebayo, Adedotun Adebayo, Lin Zhang, Lin Zhang, Boris Považay, Boris Považay, Christoph Meier, Christoph Meier, "Cost-effective optical coherence tomography spectrometer based on a tilted fiber Bragg grating", Proc. SPIE 8938, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XIV, 89381E (20 February 2014); doi: 10.1117/12.2039409; https://doi.org/10.1117/12.2039409

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