Photonic crystal spatial filtering in broad aperture diode laser

Broad aperture semiconductor lasers usually suffer from low spatial quality of the emitted beams. Due to the highly compact character of such lasers, the use of conventional intracavity spatial filters is problematic. We demonstrate that extremely compact photonic crystal spatial filters, incorporat...

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Bibliographic Details
Published in:Applied physics letters 2019-09, Vol.115 (14)
Main Authors: Gawali, S., Gailevičius, D., Garre-Werner, G., Purlys, V., Cojocaru, C., Trull, J., Montiel-Ponsoda, J., Staliunas, K.
Format: Article
Language:English
Subjects:
Apertures
Applied physics
Bessel beam
Brightness
Cristalls fotònics
Doppler effect
Física
Gaussian beam optics
Laser beams
Lasers
Lenses
Làsers
Microfabrication
Optical devices
Photonic crystals
Semiconductor lasers
Spatial filtering
Àrees temàtiques de la UPC
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Summary:Broad aperture semiconductor lasers usually suffer from low spatial quality of the emitted beams. Due to the highly compact character of such lasers, the use of conventional intracavity spatial filters is problematic. We demonstrate that extremely compact photonic crystal spatial filters, incorporated into a laser resonator, can improve the beam spatial quality and, correspondingly, increase the brightness of the emitted radiation. We report the decrease in the M2 value from 47 down to 28 due to photonic crystal spatial intracavity filtering and the increase in the brightness by a factor of 1.5, giving a proof of principle of intracavity photonic crystal spatial filtering in broad area semiconductor lasers.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5113780