Modal imaging of a laser Gaussian-beam reflected off a surface

M. Benelajla; E. Kammann; B. Urbaszek; K. Karrai

doi:10.1117/12.2568365

20 August 2020 Modal imaging of a laser Gaussian-beam reflected off a surface

M. Benelajla, E. Kammann, B. Urbaszek, K. Karrai

Proceedings Volume 11485, Reflection, Scattering, and Diffraction from Surfaces VII; 114850E (2020) https://doi.org/10.1117/12.2568365
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

We map the weak modal transformation of a polarized optical Gaussian beam reflected o a surface using an optical confocal scanning setup, designed to detect the resonance fluorescence of a quantum emitter. Such challenging measurements require the suppression of laser background by several order of magnitudes. Normally, high quality commercial crossed polarizers allows a laser suppression down to 5 to 6 orders of magnitudes. Surprisingly, when used in combination with a reflecting surface, the extinction ratio is boosted up to 9 order of magnitudes. This unexpected but very welcome enhancement finds its origin in the Imbert-Fedorov effect, which manifests itself in the reflectivity of a Gaussian laser beam off a mirror. In this work, we note that this effect give rise to a cross-polarized component carried by a TEM₀₁ Hermite-Gaussian spatial mode which we imaged using a confocal scanning technique for the first time

Conference Presentation

Citation Download Citation

M. Benelajla, E. Kammann, B. Urbaszek, and K. Karrai "Modal imaging of a laser Gaussian-beam reflected off a surface", Proc. SPIE 11485, Reflection, Scattering, and Diffraction from Surfaces VII, 114850E (20 August 2020); https://doi.org/10.1117/12.2568365

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