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Title: Ultra-short longitudinal spatial coherence length of laser light with the combined effect of spatial, angular, and temporal diversity

We demonstrate ultra-high axial-resolution topography and tomography of multilayered objects using pseudo thermal light source, i.e., laser. The longitudinal spatial coherence (LSC) length of light was significantly reduced by synthesizing a pseudo thermal source with the combined effect of spatial, angular, and temporal diversity. Thus, generating a low spatially coherent (i.e., broad angular frequency spectrum) light source having narrow temporal frequency spectrum. The LSC length was reduced less than 10 μm using a very low magnification lens. Experimental results of optical sectioning of multilayer objects with high axial-resolution of the order of 4 μm was achieved which is comparable to broadband light source. The present system does not require any dispersion compensation optical system for biological samples as a highly monochromatic light source is used.
Authors:
; ;  [1] ;  [2]
  1. Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016 (India)
  2. Department of Electrical and Instrumentation Engineering, Thapar University, Patiala, Punjab 147004 (India)
Publication Date:
OSTI Identifier:
22412781
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 9; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COHERENCE LENGTH; COMPARATIVE EVALUATIONS; LASERS; LAYERS; LENSES; LIGHT SOURCES; MONOCHROMATIC RADIATION; OPTICAL SYSTEMS; RESOLUTION; TOMOGRAPHY; TOPOGRAPHY; VISIBLE RADIATION