Integration of relay optics in LED-based reflective off-axis digital holographic microscopy

Dongyeon Kim; Byounghyo Lee; Dongheon Yoo; Seungjae Lee; Byoungho Lee

doi:10.1117/12.2318665

7 September 2018 Integration of relay optics in LED-based reflective off-axis digital holographic microscopy

Dongyeon Kim, Byounghyo Lee, Dongheon Yoo, Seungjae Lee, Byoungho Lee

Proceedings Volume 10834, Speckle 2018: VII International Conference on Speckle Metrology; 108341A (2018) https://doi.org/10.1117/12.2318665
Event: SPECKLE 2018: VII International Conference on Speckle Metrology, 2018, Janów Podlaski, Poland

Abstract

Digital holography is widely known as one of the techniques reconstructing a depth profile of the object. For digital holography (DH), the light source that has a long coherence length such as laser or laser diode is generally recommended. Recently, digital holographic microscopy (DHM) utilizing light emitting diode (LED) as a light source has attracted attention. However, it has to satisfy certain conditions for LED be utilized in off-axis DHM as it has small coherence length. Due to this fact, the hologram cannot be captured from the other side of a beam splitter. Therefore, we propose an LED-based off-axis reflective DHM that combines a 4-f system that optically relays the field to the sensor plane of charge-coupled device (CCD). We analyze the reason why the sample plane has to be relayed by 4-f system. We provide experimental results to verify the necessity of relay optics in LED-based reflective off-axis DHM.

Citation Download Citation

Dongyeon Kim, Byounghyo Lee, Dongheon Yoo, Seungjae Lee, and Byoungho Lee "Integration of relay optics in LED-based reflective off-axis digital holographic microscopy", Proc. SPIE 10834, Speckle 2018: VII International Conference on Speckle Metrology, 108341A (7 September 2018); https://doi.org/10.1117/12.2318665

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