Characterisation of light emitting diodes (LEDs) for application in digital holographic microscopy for inspection of micro and nanostructured surfaces

被引：115

作者：

Kemper, Bjoern ^{[1
]}

Stuerwald, Stephan ^{[1
]}

Remmersmann, Christian ^{[1
]}

Langehanenberg, Patrik ^{[1
]}

von Bally, Gert ^{[1
]}

机构：

[1] Univ Munster, Ctr Biomed Opt & Photon, D-48129 Munster, Germany

来源：

OPTICS AND LASERS IN ENGINEERING | 2008年 / 46卷 / 07期

关键词：

digital holographic microscopy; light emitting diodes; reduction of coherent noise;

D O I：

10.1016/j.optlaseng.2008.03.007

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Partial coherent light sources open up prospects for phase noise reduction in digital holographically reconstructed phase distributions by suppressing multiple reflections in the experimental setup. Thus, light emitting diodes (LEDs) are investigated for application in digital holographic microscopy. First, the spectral properties and the resulting coherence length of an LED are characterised. In addition, an analysis of dispersion effects and their influence on the hologram formation is carried out. The coherence length of LEDs in the range of a few micrometers restricts the maximum interference fringe number in off-axis holography for spatial phase shifting. Thus, the application of temporal phase-shifting-based digital holographic reconstruction techniques is compared to spatial phase-shifting-based methods. It is demonstrated that LEDs are applicable for digital holographic microscopy in connection with both spatial and temporal phase-shifting-based techniques for reduction of noise in comparison to a laser-light-based experimental setup. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：499 / 507

页数：9

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