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1 April 2020 Spatial filtering in broad area semiconductor laser using photonic crystal
Sandeep Babu Gawali, Darius Gailevičius, Vytautas Purlys, Jose Trull, Crina Cojocaru, Kestutis Staliunas
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Proceedings Volume 11356, Semiconductor Lasers and Laser Dynamics IX; 113560R (2020) https://doi.org/10.1117/12.2555682
Event: SPIE Photonics Europe, 2020, Online Only
Abstract
In high power regimes, broad area semiconductor lasers usually suffer from poor beam quality due to their asymmetric beam divergence, large beam quality factor (M2) and from the absence of any intrinsic filtering mechanism that can be integrated inside the cavity. In this work, we present a compact photonic crystal spatial filter, fabricated by periodically modulating refractive index media on a glass substrate using tightly focused femtoseconds laser. This filter work by deflecting the higher angular field components in a given frequency range. We demonstrate the spatial filtering effect when placed in an extended cavity configuration for a single BAS emitter, with transverse width of 400-μm and cavity length 1500-μm. We report a decrease of the laser M2 value along the slow axis with the introduction of the photonic crystal inside the cavity, together with a brightness enhancement by a factor of 1.5 compared to that of an unfiltered case. These results were compared with those obtained in the far-field domain, with a conventional spatial filter consisting of an intra-cavity slit.
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Sandeep Babu Gawali, Darius Gailevičius, Vytautas Purlys, Jose Trull, Crina Cojocaru, and Kestutis Staliunas "Spatial filtering in broad area semiconductor laser using photonic crystal", Proc. SPIE 11356, Semiconductor Lasers and Laser Dynamics IX, 113560R (1 April 2020); https://doi.org/10.1117/12.2555682
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KEYWORDS
Spatial filters
Semiconductor lasers
Photonic crystals
Mirrors
Near field
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