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Energy-efficient low-Fresnel-number Bessel beams and their application in optical coherence tomography

Lorenser, D., Singe, C.C., Curatolo, A. and Sampson, David (2014) Energy-efficient low-Fresnel-number Bessel beams and their application in optical coherence tomography Optics Letters, 39 (3). pp. 548-551.

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Bessel beams feature a very large depth-of-focus (DOF) compared to conventional focusing schemes, but their central lobe carries only a small fraction of the total beam power, leading to a strongly reduced peak irradiance. This is problematic for power-limited applications, such as optical coherence tomography (OCT) or optical coherence microscopy, as it can result in a prohibitive reduction of the signal-to-noise ratio (SNR). Using scalar diffraction theory, we show that the trade-off between DOF and peak irradiance of Bessel beams depends solely on the Fresnel number N. We demonstrate the existence of a low-Fresnel-number regime,N < 10, in which axicons with Gaussian illumination can generate energy-efficient Bessel beams with a small number of sidelobes. In the context of OCT, this translates into DOF enhancements of up to 13X for a SNR penalty below 20 dB, which is confirmed by our experiments. We expect that these findings will enable improved performance of optical systems with extended DOF.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences
Faculty of Health and Medical Sciences
Authors :
Lorenser, D.
Singe, C.C.
Curatolo, A.
Date : 2014
DOI : 10.1364/OL.39.000548
Uncontrolled Keywords : Bessel functions, Energy efficiency, Laser beams, Research laboratories, Bessel beam, Depth of focus, Energy efficient, Fresnel number, Optical coherence microscopy, Peak irradiance, Scalar diffraction theory, Signaltonoise ratio (SNR), Optical tomography
Depositing User : Maria Rodriguez-Marquez
Date Deposited : 05 Jun 2018 09:17
Last Modified : 19 Sep 2018 11:32

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