Transforming the (0,1)* LG mode with radial polarization to a nearly Gaussian beam by use of a spiral phase element and spatial filter

G. Machavariani; Y. Lumer; I. Moshe; S. Jackel

doi:10.1117/12.738861

27 April 2007 Transforming the (0,1)* LG mode with radial polarization to a nearly Gaussian beam by use of a spiral phase element and spatial filter

G. Machavariani, Y. Lumer, I. Moshe, S. Jackel

Author Affiliations +

Proceedings Volume 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers; 63461W (2007) https://doi.org/10.1117/12.738861
Event: XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 2006, Gmunden, Austria

Abstract

Radially-polarized beams can be strongly amplified without significant birefringence- induced aberrations. However, further improvement of the beam quality is desirable. In effort to transform the radially-polarized beam to a nearly-Gaussian beam, we consider effect of a spiral phase element (SPE) on the Laguerre-Gaussian (LG) (0,1)* beam with radial polarization, and compare this with the case when the input beam is a LG (0,1)* beam with spiral phase and uniform or undefined polarization. The LG (0,1)* beam with radial polarization, despite its identity in intensity profile to the beam with spiral phase, has distinctly different properties when interacting with the SPE. With the SPE and spatial filter, we transformed the radially-polarized (0,1)* mode with M²=2.8 to a nearly-Gaussian beam with M²=1.7. Measured transformation efficiency was 50%, and the beam brightness P/(M²)² was practically unchanged. The SPE affects polarization state of the radially-polarized beam, leading to appearance of spin angular momentum in the beam center at the far-field.

Citation Download Citation

G. Machavariani, Y. Lumer, I. Moshe, and S. Jackel "Transforming the (0,1)* LG mode with radial polarization to a nearly Gaussian beam by use of a spiral phase element and spatial filter", Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 63461W (27 April 2007); https://doi.org/10.1117/12.738861

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