SAIP 2011 Support
Generation of a Laguerre-Gaussian TEM01 mode in a monolithic microchip laser
Presented by Mr. Darryl NAIDOO on 14 Jul 2011 from 17:00 to 19:00
Type: Poster Presentation
Track: Track C - Lasers, Optics and Spectroscopy
<p>We explore a method in the selection of a specific higher-order mode through judicious shaping of the pump light to create a high modal overlap with the desired mode. To demonstrate this principle, we create a donut-shaped pump profile in the focal plane of a converging lens by use of a beam shaping element. This pump profile is used to longitudinally pump a monolithic microchip laser and a plano-concave resonator cavity where we achieve a TEM01 output with powers of ~12 mW and ~14 mW at slope efficiencies of 17% and 21% respectively. In both cases the modal purity is high with a beam quality factor of ~2. Diffractive pump shaping of this form is advantageous as it allows for high pump intensity even with low pumping powers, thus ensuring sufficient gain is achieved for laser oscillation.
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