Coherence‐Tailored Multiwavelength High‐Speed Quantitative Phase Imaging with a High Phase Stability via a Frequency Comb

• Published in: Advanced photonics research Vol. 2; no. 2
• Main Authors: Boonruangkan, Jeeranan, Farrokhi, Hamid, Rohith, Thazhe Madam, Toh, Hui Ting, Mishra, Abhinay, Sup Yoon, Ho, Kwok, Samuel, Carney, Tom, Kim, Seung Woo, Kim, Young‐Jin
• Format: Journal Article
• Language: English
• Published: Hoboken John Wiley & Sons, Inc 01.02.2021; Wiley-VCH
• Subjects: biological samples; coherence control; frequency comb; Lasers; Light emitting diodes; Microscopy; Morphology; quantitative phase imaging
• ISSN: 2699-9293; 2699-9293
• DOI: 10.1002/adpr.202000088

Coherent imaging enables noninvasive, label‐free, and quantitative monitoring of the dynamic motions of transparent microobjects requested in life sciences, biochemistry, material sciences, and fluid mechanics. Quantitative phase imaging (QPI), a coherent imaging technique, provides full‐field optical phase information through light interference. The use of coherence, however, inevitably accompanies phase ambiguity and coherent artifacts, such as speckle, diffraction, and parasitic interference, which severely deteriorate the interferograms to hinder successful phase reconstruction. Herein, it is demonstrated that a frequency comb can newly provide a wide coherence tunability for higher visibility interferograms, phase‐coherent multiple wavelengths for extracting physical height information from refractive index, and higher phase stability (2.39 × 10−3 at 10 s averaging time) at a higher speed up to 16.9 kHz. These superior characteristics of frequency‐comb‐referenced QPI will enable in‐depth understanding of dynamic motions in cellular, biomolecular, and microphysical samples. Frequency‐comb‐referenced quantitative phase imaging (FCR‐QPI) provides a wide coherence tunability for higher visibility interferograms, phase‐coherent multiple wavelengths for refractive index measurement, and higher phase stability at a higher speed (16.9 kHz), highly requested in life sciences, biochemistry, material sciences, and fluid mechanics. These superior characteristics of FCR‐QPI will enable in‐depth understanding of dynamic motions in cellular, biomolecular, and microphysical samples.