Ultrafast dark-field surface inspection with hybrid-dispersion laser scanning

Yazaki, Akio; Kim, Chanju; Chan, Jacky C. K.; Mahjoubfar, Ata; Goda, Keisuke; Watanabe, M.; Jalali, Bahram

doi:10.1063/1.4885147

Cited by 35 publications

(24 citation statements)

References 19 publications

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“…Time stretch imaging technology enables fast continuous blur-free acquisition of quantitative phase and intensity image, offering high throughput image analysis for various applications such as industrial and biomedical imaging 1 – 11 . The imaging technology exploits spatial and temporal dispersion of broadband optical pulses, which realizes frame rates equivalent to the pulse repetition rates of mode-locked laser ranging from a few MHz to GHz 12 .…”

Section: Introductionmentioning

confidence: 99%

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Matrix Analysis of Warped Stretch Imaging

Kim

Mahjoubfar

Chan

et al. 2017

Sci Rep

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Sensitive and fast optical imaging is needed for scientific instruments, machine vision, and biomedical diagnostics. Many of the fundamental challenges are addressed with time stretch imaging, which has been used for ultrafast continuous imaging for a diverse range of applications, such as biomarker-free cell classification, the monitoring of laser ablation, and the inspection of flat panel displays. With frame rates exceeding a million scans per second, the firehose of data generated by the time stretch camera requires optical data compression. Warped stretch imaging technology utilizes nonuniform spectrotemporal optical operations to compress the image in a single-shot real-time fashion. Here, we present a matrix analysis method for the evaluation of these systems and quantify important design parameters and the spatial resolution. The key principles of the system include (1) time/warped stretch transformation and (2) the spatial dispersion of ultrashort optical pulse, which are traced with simple computation of ray-pulse matrix. Furthermore, a mathematical model is constructed for the simulation of imaging operations while considering the optical and electrical response of the system. The proposed analysis method was applied to an example time stretch imaging system via simulation and validated with experimental data.

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Section: Introductionmentioning

confidence: 99%

“…However, the study relies on an approximation of a system to a linear dispersion model which limits the accuracy of performance analysis and its use in image reconstruction. The only existing way to precisely analyze a warped stretch imaging system is by experimental observation of a constructed system 10 , 11 .…”

Section: Introductionmentioning

confidence: 99%

Matrix Analysis of Warped Stretch Imaging

Kim

Mahjoubfar

Chan

et al. 2017

Sci Rep

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“…These instruments produce a torrent of data that overwhelms their data acquisition and processing backend. For example, the time stretch imager captures images at roughly one hundred million scans per second with each scan containing about one thousand samples [ 17 , 18 ]. Assuming each of these samples is digitized with a typical 8 bits of accuracy, time stretch microscopy (STEAM) produces 0.8 Tbit of data per second.…”

Section: Introductionmentioning

confidence: 99%

Optical Data Compression in Time Stretch Imaging

2015

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Time stretch imaging offers real-time image acquisition at millions of frames per second and subnanosecond shutter speed, and has enabled detection of rare cancer cells in blood with record throughput and specificity. An unintended consequence of high throughput image acquisition is the massive amount of digital data generated by the instrument. Here we report the first experimental demonstration of real-time optical image compression applied to time stretch imaging. By exploiting the sparsity of the image, we reduce the number of samples and the amount of data generated by the time stretch camera in our proof-of-concept experiments by about three times. Optical data compression addresses the big data predicament in such systems.

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“…Although successfully applied in the areas such as time-stretch microscope [15], ultrafast spectroscope [17], and optical coherence tomography (OCT) [18][19][20][21][22], it is largely under-explored as ultrastable swept sources, particularly in terms of sweeping bandwidth and stability. In this regard, recently several works have devoted to the speed improvement of the swept source through optical time-stretch technique, particularly in the wavelength windows of 800 nm [23,24] and 1550 nm [25,26]. We also proposed a stable 11.5-MHz breathing laser as inertia-free swept source (BLISS) and achieved a sweep range of ~60 nm in the 1550-nm window [27], which was benefitted from the dispersion engineering [28,29].…”

Section: Introductionmentioning

confidence: 99%

28 MHz swept source at 10 μm for ultrafast quantitative phase imaging

Wei¹,

Lau²,

Xu³

et al. 2015

Biomed. Opt. Express

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Emerging high-throughput optical imaging modalities, in particular those providing phase information, necessitate a demanding speed regime (e.g. megahertz sweep rate) for those conventional swept sources; while an effective solution is yet to be demonstrated. We demonstrate a stable breathing laser as inertia-free swept source (BLISS) operating at a wavelength sweep rate of 28 MHz, particularly for the ultrafast interferometric imaging modality at 1.0 μm. Leveraging a tunable dispersion compensation element inside the laser cavity, the wavelength sweep range of BLISS can be tuned from ~10 nm to ~63 nm. It exhibits a good intensity stability, which is quantified by the ratio of standard deviation to the mean of the pulse intensity, i.e. 1.6%. Its excellent wavelength repeatability, <0.05% per sweep, enables the single-shot imaging at an ultrafast line-scan rate without averaging. To showcase its potential applications, it is applied to the ultrafast (28-MHz line-scan rate) interferometric time-stretch (iTS) microscope to provide quantitative morphological information on a biological specimen at a lateral resolution of 1.2 μm. This fiber-based inertia-free swept source is demonstrated to be robust and broadband, and can be applied to other established imaging modalities, such as optical coherence tomography (OCT), of which an axial resolution better than 12 μm can be achieved. Y. Wong, and K. K. Tsia, "Interferometric time-stretch microscopy for ultrafast quantitative cellular and tissue imaging at 1 μm," J.

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Ultrafast dark-field surface inspection with hybrid-dispersion laser scanning

Abstract: Adaptive all-order dispersion compensation of ultrafast laser pulses using dynamic spectral holography

Cited by 35 publications

References 19 publications

Matrix Analysis of Warped Stretch Imaging

Matrix Analysis of Warped Stretch Imaging

Optical Data Compression in Time Stretch Imaging

28 MHz swept source at 10 μm for ultrafast quantitative phase imaging

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