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  4. Cylindrical microlenses for collimating high-power diode lasers
 
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1997
Conference Paper
Title

Cylindrical microlenses for collimating high-power diode lasers

Abstract
Monolithic linear arrays of diode lasers, also known as diode laser bars, are the basic elements for most high-power laser applications such as solid-state laser pumping or material processing. Cylindrical microlenses used as fast-axis collimators for 10-mm diode bars require very high angles of aperture (up to 100 degree FW1/e2, equivalent to a numerical aperture of approx. 0.8) to capture most of the emitted laserpower. For the efficient longitudinal pumping of laser rods, or the narrow focusing of the diode laser radiation (fiber coupling, material processing), high-quality microlenses with small lens aberrations are necessary to avoid power losses and beam quality degradation. In this paper, lens design considerations are presented together with alignment tolerances and the variation of the collimated beam parameters. Measuring methods for the lens characterization are discussed. Manufacturing techniques are summarized, and the performance of microlenses is measured by the beam wid th and divergence of the collimated diode laser beam.
Author(s)
Sturm, V.
Loosen, P.
Treusch, H.G.
Mainwork
Lasers in material processing  
Conference
Conference on Lasers in Material Processing 1997  
Language
English
Fraunhofer-Institut für Lasertechnik ILT  
Keyword(s)
  • aspherical cylinder lense

  • diode laser beam shaping

  • high-power diode laser

  • micro-optics

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