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. 2017 Jun 20;8(7):3343–3359. doi: 10.1364/BOE.8.003343

Fig. 1.

Fig. 1

Schematic of the extended-focus OCM using a broad spectrum in the visible wavelength range and a high NA objective for high axial and lateral resolution. By combining a Bessel illumination, generated by an axicon lens, and a Gaussian detection, a dark-field extended-focus system can be obtained. P: Polarizer, BBDM: Broadband dielectric mirror, BS: Beamsplitter, PBS: Polarizing beamsplitter.