Efficient diffractive collimator for edge-emitting laser diodes

Andrzej Kowalik; Krzysztof Góra; Grażyna Adamkiewicz; Monika Ziętek; Grzegorz Mikuła; Andrzej Kołodziejczyk; Zbigniew Jaroszewicz

doi:10.1117/12.665301

25 April 2006 Efficient diffractive collimator for edge-emitting laser diodes

Andrzej Kowalik, Krzysztof Góra, Grażyna Adamkiewicz, Monika Ziętek, Grzegorz Mikuła, Andrzej Kołodziejczyk, Zbigniew Jaroszewicz

Author Affiliations +

Proceedings Volume 6187, Photon Management II; 61871E (2006) https://doi.org/10.1117/12.665301
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

Compared with conventional optical systems, diffractive optical elements are more suitable to transform laser diode beams because they can form more complex wavefronts and better fulfill requirements of miniaturization. However, high numerical aperture needed to collimate the fast axis of edge-emitting laser diodes demands extremely high spatial frequency elements when single DOE is used. That involves complicated design methods based on rigorous diffraction theory and fabricating technology with sub-wavelength resolution and nanometer accuracy. To overcome these difficulties we propose a transmission DOE consisting of elliptical and cylindrical zone plates fabricated onto opposite sides of a substrate. The main advantage of such a solution lies in fact that each of the zone plates has smaller spatial frequency and can be made even as 8-phase-level element with theoretically 95% diffraction efficiency using available microlithographic technology. In result, monolithic collimating system that allows to compensate astigmatism and to convert an elliptical laser diode light beam to circular one can be achieved with NA higher than 0.5 and efficiency over 80%.

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Andrzej Kowalik, Krzysztof Góra, Grażyna Adamkiewicz, Monika Ziętek, Grzegorz Mikuła, Andrzej Kołodziejczyk, and Zbigniew Jaroszewicz "Efficient diffractive collimator for edge-emitting laser diodes", Proc. SPIE 6187, Photon Management II, 61871E (25 April 2006); https://doi.org/10.1117/12.665301

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