Laser beam homogenizing system design for photoluminescence

Lou, Shishu; Zhu, Huishi; Han, Peng

doi:10.1364/ao.53.004637

Cited by 7 publications

(3 citation statements)

References 8 publications

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“…In the practical application, it is also greater than 85%. Finally, we apply this optical system (double telecentric) in the semiconductor photoluminescence imaging detection, the light homogenized effect is ideal 15 .…”

Section: Methodsmentioning

confidence: 99%

Investigation of diffusion length distribution on polycrystalline silicon wafers via photoluminescence methods

Lou

Zhu

et al. 2015

Sci Rep

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Characterization of the diffusion length of solar cells in space has been widely studied using various methods, but few studies have focused on a fast, simple way to obtain the quantified diffusion length distribution on a silicon wafer. In this work, we present two different facile methods of doing this by fitting photoluminescence images taken in two different wavelength ranges or from different sides. These methods, which are based on measuring the ratio of two photoluminescence images, yield absolute values of the diffusion length and are less sensitive to the inhomogeneity of the incident laser beam. A theoretical simulation and experimental demonstration of this method are presented. The diffusion length distributions on a polycrystalline silicon wafer obtained by the two methods show good agreement.

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Section: Methodsmentioning

confidence: 99%

Investigation of diffusion length distribution on polycrystalline silicon wafers via photoluminescence methods

Lou

Zhu

et al. 2015

Sci Rep

Self Cite

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“…Uniform illuminations on target surfaces are required in many applications such as laser fusion, laser cosmetology and material processing [ 1 , 2 , 3 ]. However, most laser beams are distributed in the Gaussian form or other nonuniform forms.…”

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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“…In many applications such as laser fusion, laser cosmetology, and material processing, uniform illumination on the target surface is usually required [1]- [3]. Therefore, the shaping of an arbitrary input intensity of a coherent laser beam into a top hat is an important issue.…”

Section: Introductionmentioning

confidence: 99%

Center Off-Axis Tandem Microlens Arrays for Beam Homogenization

et al. 2015

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Tandem microlens arrays are commonly used in many applications for the beam shaping of an arbitrary input intensity distribution into a top hat. Because of the periodic structure of the regular arrays, the output intensity distribution is modulated by equidistantly located sharp intensity peaks, which reduces the homogeneity of the beam. A new concept is proposed in this paper for tandem microlens arrays incorporating a center off-axis microlens array for the generation of an intensity far-field distribution with improved homogeneity under coherent illumination with the envelope of a top hat. The geometric centers of the sub-apertures are randomly offset by the light axis of the sublens in the array to break the periodicity. The influences of the various off-axis amounts on the homogeneity are discussed. The center off-axis microlens array has been fabricated, and the corresponding laser beam homogenizing experiment has been carried out. The results verify that a high homogeneity output intensity distribution can be achieved based on the presented method.

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Laser beam homogenizing system design for photoluminescence

Cited by 7 publications

References 8 publications

Investigation of diffusion length distribution on polycrystalline silicon wafers via photoluminescence methods

Investigation of diffusion length distribution on polycrystalline silicon wafers via photoluminescence methods

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

Center Off-Axis Tandem Microlens Arrays for Beam Homogenization

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