Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
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.
