Micro-lens arrays for laser beam homogenization and transformation

Sinhoff, V.; Hambuecker, Stefan; Kleine, Klaus R. F.; Ruebenach, O.; Wessling, Christian

doi:10.1117/12.2002433

Cited by 5 publications

(4 citation statements)

References 1 publication

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“…A laser line generator can be constructed using a cylindrical lens [13], [14], diffractive optics [15], a Powell lens [16], or a microlens array [17]. Although such construction leads to a simple and robust system, speckle arises when such a laser-line is projected onto a rough surface.…”

Section: Introductionmentioning

confidence: 99%

LED-Based Collimating Line-Light Combining Freeform and Fresnel Optics

et al. 2018

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Illumination for line-scan machine vision systems is required to produce a highly asymmetric elliptical beam pattern, to maximize system speed and accuracy. The use of LED emitters with symmetric Lambertian emission patterns is challenging in this context, requiring significant beam reshaping. A design for a collimated line-light, with long working distance, utilizing LEDs with symmetric Lambertian emission patterns, is presented. Using a combination of Fresnel lenses and total internal reflection (TIR) optics, an elliptical beam with a high degree of collimation is achieved. TIR elements are designed based on an adaptation of a freeform lens design method published by Chen et al. [Opt. Express 20, 10 (2012)]. Practical performance of the design is verified experimentally using a prototype unit. In addition, the design is compared, using ray tracing software, to line-lights constructed using commercially available symmetric and elliptical TIR lenses, and its superior performance is confirmed. The optical design described is fully manufacturable and suitable for both smalland large-scale production.

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Section: Introductionmentioning

confidence: 99%

LED-Based Collimating Line-Light Combining Freeform and Fresnel Optics

et al. 2018

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“…This situation is submitted to specific boundary conditions for limited available space in the array situation and material producability. Therefore we investigate the particular effect of vignetting losses in the beam twisting element, being one of the important performance limitations for the micro-optic setup [1][2][3][4][5] The Beam Twister (BT) is a cylindrical 1:1 Kepler beam expander. When put into a collimated beam it works as a mirror along the axis of the BT.…”

Section: Introductionmentioning

confidence: 99%

Beam vignetting effect in micro-optic collimation and transmission for high power diode laser arrays

et al. 2015

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High power diode laser arrays need special micro-optic beamshaping to optimize for collimation and spot focusing. A known and established solution makes use of cylindrical micro-optics for fast axis collimation and subsequent individual twisting of each emitter beamlet by a micro-optic cylindrical telescope array in order to achieve a symmetric beam parameter product. A crucial factor for the overall performance is the achievable transmission to collimation and the fibercoupling efficiency. We present an optical analysis of vignetting effects on the transmission in the beam twisting setup and show an optimization which can be achieved by advanced micro-optic production technologies.

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“…However, most laser beams are distributed in the Gaussian form or other nonuniform forms. Therefore, the shaping of an arbitrary input intensity into a top-hat format is a key issue [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

The Effects of Profile Errors of Microlens Surfaces on Laser Beam Homogenization

et al. 2017

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Microlens arrays (MLAs) are key optical components in laser beam homogenization. However, due to imperfect surface profiles resulting from microfabrication, the functionalities of MLAs in beam modulation could be compromised to some extent. In order to address this issue, the effects of surface profile mismatches between ideal and fabricated MLAs on beam homogenization were analyzed. Four types of surface profile errors of MLAs were modeled theoretically and numerical simulations were conducted to quantitatively estimate the effects of these profile errors on beam homogenization. In addition, experiments were conducted to validate the simulation results, revealing that profile errors leading to optical deviations located on the apex of microlenses affected beam homogenization less than deviations located further away from it. This study can provide references for the further applications of MLAs in beam homogenization.

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Micro-lens arrays for laser beam homogenization and transformation

Cited by 5 publications

References 1 publication

LED-Based Collimating Line-Light Combining Freeform and Fresnel Optics

LED-Based Collimating Line-Light Combining Freeform and Fresnel Optics

Beam vignetting effect in micro-optic collimation and transmission for high power diode laser arrays

The Effects of Profile Errors of Microlens Surfaces on Laser Beam Homogenization

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