1. Bessel beam spectral-domain high-resolution optical coherence tomography with micro-optic axicon providing extended focusing range

    Bessel beam spectral-domain high-resolution optical coherence tomography with micro-optic axicon providing extended focusing range
    Endoscopic imaging in tubular structures, such as the tracheobronchial tree, could benefit from imaging optics with an extended depth of focus (DOF) to accommodate the varying sizes of tubular structures across patients and along the tree within the same patient. Yet the extended DOF needs to be accomplished without sacrificing resolution while maintaining sufficient sensitivity and speed of imaging. In this Letter, we report on the measured resolution and sensitivity achieved with a custom-made micro-optic axicon lens designed to theoretically achieve an 8 mm DOF. A measured invariant resolution of 8 m is demonstrated across a 4 mm measured DOF ...
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