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

Abstract

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

Citation Formats

Ahmad, Azeem, E-mail: ahmadazeem870@gmail.com, E-mail: mehtads@physics.iitd.ac.in, Dubey, Vishesh, Mehta, D. S., E-mail: ahmadazeem870@gmail.com, E-mail: mehtads@physics.iitd.ac.in, and Srivastava, Vishal. Ultra-short longitudinal spatial coherence length of laser light with the combined effect of spatial, angular, and temporal diversity. United States: N. p., 2015. Web. doi:10.1063/1.4913870.
Ahmad, Azeem, E-mail: ahmadazeem870@gmail.com, E-mail: mehtads@physics.iitd.ac.in, Dubey, Vishesh, Mehta, D. S., E-mail: ahmadazeem870@gmail.com, E-mail: mehtads@physics.iitd.ac.in, & Srivastava, Vishal. Ultra-short longitudinal spatial coherence length of laser light with the combined effect of spatial, angular, and temporal diversity. United States. doi:10.1063/1.4913870.
Ahmad, Azeem, E-mail: ahmadazeem870@gmail.com, E-mail: mehtads@physics.iitd.ac.in, Dubey, Vishesh, Mehta, D. S., E-mail: ahmadazeem870@gmail.com, E-mail: mehtads@physics.iitd.ac.in, and Srivastava, Vishal. Mon . "Ultra-short longitudinal spatial coherence length of laser light with the combined effect of spatial, angular, and temporal diversity". United States. doi:10.1063/1.4913870.
@article{osti_22412781,
title = {Ultra-short longitudinal spatial coherence length of laser light with the combined effect of spatial, angular, and temporal diversity},
author = {Ahmad, Azeem, E-mail: ahmadazeem870@gmail.com, E-mail: mehtads@physics.iitd.ac.in and Dubey, Vishesh and Mehta, D. S., E-mail: ahmadazeem870@gmail.com, E-mail: mehtads@physics.iitd.ac.in and Srivastava, Vishal},
abstractNote = {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.},
doi = {10.1063/1.4913870},
journal = {Applied Physics Letters},
number = 9,
volume = 106,
place = {United States},
year = {Mon Mar 02 00:00:00 EST 2015},
month = {Mon Mar 02 00:00:00 EST 2015}
}