3 March 2014 Generation of new spatial and temporal coherent states using VECSEL technology: VORTEX, high order Laguerre-Gauss mode, continuum source
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Abstract
Since years, the VeCSEL concept is pointed out as a technology of choice for beyond-state-of-the-art laser light sources. The targeted coherent state in CW is typically the common gaussian TEM00, single frequency, linearly polarized lightstate. In this work, we take advantage of the VeCSEL technology for the generation of other kinds of coherent states, thanks to the insertion of intracavity functions, such as low-loss intensity and phase filters integrated on a semiconductor chip. This technological development permitted to demonstrate very pure high-order Laguerre-Gauss mode, both degenerate and non-degenerate(vortex)modes, preserving the coherence properties of usual TEM00 VeCSELs. This technology paves the way for the generation of other coherences (Bessel beams) or new functionnalities (wavelength filtering, etc.). We also explore new time domain coherence : owing to a high gain semiconductor chip design and the insertion of intracavity AOM, we demonstrated the first Frequecy-Shifted-Feedback VeCSEL, with a broadband coherence state as wide as 300 GHz.
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Mohamed Sellahi, Mohamed Seghir Seghilani, Isabelle Sagnes, Grégoire Beaudoin, Xavier Lafosse, Luc Legratiet, Philippe Lalanne, Mikhal Myara, Arnaud Garnache, "Generation of new spatial and temporal coherent states using VECSEL technology: VORTEX, high order Laguerre-Gauss mode, continuum source", Proc. SPIE 8966, Vertical External Cavity Surface Emitting Lasers (VECSELs) IV, 89660U (3 March 2014); doi: 10.1117/12.2040468; https://doi.org/10.1117/12.2040468
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