Hannover 2013 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 50: Laser applications
Q 50.6: Vortrag
Donnerstag, 21. März 2013, 15:30–15:45, F 142
A high power beam in high-order Laguerre-Gauss mode — •Christina Bogan1, Ludovico Carbone2, Andreas Freise2, Benno Willke1, and Karsten Danzmann1 — 1Albert-Einstein-Institut Hannover — 2University of Birmingham
One approach to generate hgh-order Laguerre-Gauss modes with high efficiency and purity is the use of a transmitting phase plate illuminated with a laser beam in the fundamental mode. In contrast to other methods this method has the advantage of being siutable with high laser powers. However it is less flexible than for example a mode generation with an Spatial-Light-Modulator.
In this talk we present the generation of a high power helical LG33 mode. This mode was spatially filtered by a linear cavity. The mode conversion was observed for laser powers up to 140 W sent to the phase plate. Cavity scans showed that about 75 % of the power in the beam was in order-nine modes. The intensity pattern measured in transmission of the locked cavity was found to consist to more than 95 % of the helical LG33 mode. Therefore we could demonstrate a helical LG33 mode with a laser power of 82.6 W.