Longitudinal spatial coherence (LSC) is determined by the spatial frequency content of an optical beam. The use of lenses with a high numerical aperture (NA) in full-field optical coherence tomography and a narrowband light source makes the LSC length much shorter than the temporal coherence length, hence suggesting that high-resolution 3D images of biological and multilayered samples can be obtained based on the low LSC. A simplified model is derived, supported by experimental results, which describes the expected interference output signal of multilayered samples when high-NA lenses are used together with a narrowband light source. An expression for the correction factor for the layer thickness determination is found valid for high-NA objectives. Additionally, the method was applied to a strongly scattering layer, demonstrating the potential of this method for high-resolution imaging of scattering media.
© 2011 Optical Society of AmericaFull Article | PDF Article
Yimin Wang, J. Stuart Nelson, Zhongping Chen, Bibiana Jin Reiser, Roy S. Chuck, and Robert S. Windeler
Opt. Express 11(12) 1411-1417 (2003)
Lingfeng Yu and M.K. Kim
Opt. Express 12(26) 6632-6641 (2004)
Tulsi Anna, Vishal Srivastava, Dalip Singh Mehta, and Chandra Shakher
Appl. Opt. 50(34) 6343-6351 (2011)