Low coherence interferometry modelling using combined broadband Gaussian light sources

Paul Jansz; Graham Wild; Steven Richardson; Steven Hinckley

doi:10.1117/12.916030

30 January 2012 Low coherence interferometry modelling using combined broadband Gaussian light sources

Paul Jansz, Graham Wild, Steven Richardson, Steven Hinckley

Proceedings Volume 8351, Third Asia Pacific Optical Sensors Conference; 83510C (2012) https://doi.org/10.1117/12.916030
Event: Asia Pacific Optical Sensors Conference, 2012, Sydney, Australia

Abstract

Using a Low Coherence Interferometry (LCI) model, a comparison of broadband single-Gaussian and multi-Gaussian light sources has been undertaken. For single-Gaussian sources, the axial resolution improved with source bandwidth, confirming the coherence length relation that resolution for single Gaussian sources improves with increasing spectral bandwidth. However, narrow bandwidth light sources resulted in interferograms with overlapping strata peaks and the loss of individual strata information. For multiple-Gaussian sources with the same bandwidth, spectral side lobes increased, reducing A-scan reliability to show accurate layer information without eliminating the side lobes. The simulations show the conditions needed for resolution of strata information for broadband light sources using both single and multiple Gaussian models. The potential to use the model to study LCI and OCT light sources, optical delays and sample structures can better characterise these LCI and OCT elements. Forecasting misinformation in the interferogram, may allow preliminary corrections. With improvements to the LCI-OCT model, more applications are envisaged.

Citation Download Citation

Paul Jansz, Graham Wild, Steven Richardson, and Steven Hinckley "Low coherence interferometry modelling using combined broadband Gaussian light sources", Proc. SPIE 8351, Third Asia Pacific Optical Sensors Conference, 83510C (30 January 2012); https://doi.org/10.1117/12.916030

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