Efficient beamshaping of high-power diode lasers using micro-optics

Hans Peter Herzig; Andreas Schilling; Laurent Stauffer; Urs Vokinger; Markus Rossi

doi:10.1117/12.448150

13 November 2001 Efficient beamshaping of high-power diode lasers using micro-optics

Hans Peter Herzig, Andreas Schilling, Laurent Stauffer, Urs Vokinger, Markus Rossi

Proceedings Volume 4437, Gradient Index, Miniature, and Diffractive Optical Systems II; (2001) https://doi.org/10.1117/12.448150
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

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.

Citation Download Citation

Hans Peter Herzig, Andreas Schilling, Laurent Stauffer, Urs Vokinger, and Markus Rossi "Efficient beamshaping of high-power diode lasers using micro-optics", Proc. SPIE 4437, Gradient Index, Miniature, and Diffractive Optical Systems II, (13 November 2001); https://doi.org/10.1117/12.448150

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