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Efficient beamshaping of high-power diode lasers using micro-optics
Auteur(s)
Herzig, Hans-Peter
Schilling, Andreas
Stauffer, Laurent
Vokinger, Urs
Rossi, Markus
Date de parution
2001
In
Gradient Index, Miniature, and Diffractive Optical Systems II (Proceedings of SPIE), International Society for Optical Engineering (SPIE), 2001/4437//134-141
Résumé
We designed, fabricated and characterized a micro-optical beamshaping device, intended to optimize the coupling of an incoherent, linearly extended high-power diode-laser into a multimode fiber. The device uses two aligned micro-optical elements (DOEs) in combination with conventional optics. With a first prototype we achieved an overall efficiency of 28 %. Straightforward improvements, like antireflective coatings and the use of graytone elements, should lead to an efficiency of about 50 %. The device is compact and the fabrication is suited for mass production at low cost. We applied three different technologies for the fabrication of the micro-optical elements and compared the performance. The technologies were: direct laser writing, multiple projection photolithography in combination with reactive ion etching (RIE) in fused silica, and high-energy-beam-sensitive (HEBS) glass graytone lithography in photoresist. We found that the refractive type elements (graytone) yield better efficiency for large deflection angles, while diffractive elements give intrinsically accurate deflection angles.
Identifiants
Type de publication
journal article
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