40 MHz Swept-Source Optical Coherence Tomography at 1060 nm Using a Time-Stretch and Supercontinuum Spectral Broadening Dynamics

Grelet, Sacha; Jiménez, Alejandro Martínez; Engelsholm, Rasmus D.; Montague, Patrick Bowen; Podoleanu, Adrian Gh.

doi:10.1109/jphot.2022.3226820

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…The swept source consists of a time-stretch laser that sweeps at 40 MHz. 3 Pulses from a femtosecond laser are coupled into a photonic crystal fiber. Nonlinear effects in the fiber generate a spectrum of 100 nm at -3 dB, and 200 nm at -10 dB, centered at 1060 nm.…”

Section: Methodsmentioning

confidence: 99%

Dual ultrahigh speed swept-source and time domain optical coherence tomography system using a time stretch laser and a KTN deflector

Martínez Jiménez,

Grelet,

Bowen Montague

et al. 2023

Optical Coherence Imaging Techniques and Imaging in Scattering Media V

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We present an ultrahigh-speed swept source optical coherence tomography (SS-OCT) system that allows a volume rate of 400 Hz paired with a time domain (TD) subsystem. For the SS-OCT, a 40 MHz swept source is used, while for the TD-OCT, a broadband source. Both systems employ a scanning system that consists of a KTN scanner paired with a galvoscanner. The KTN crystal scans the beam laterally at 100 kHz. This allows B-scan OCT repetition rate, while with the galvoscanner 200 lines are obtained at 400 Hz in the en-face display of both SS-OCT and TD-OCT systems.

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Section: Methodsmentioning

confidence: 99%

Dual ultrahigh speed swept-source and time domain optical coherence tomography system using a time stretch laser and a KTN deflector

Martínez Jiménez,

Grelet,

Bowen Montague

et al. 2023

Optical Coherence Imaging Techniques and Imaging in Scattering Media V

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“…However, the high absorption of water at this band limits the applications for imaging tissue. In our previous studies, we investigated the limits of the time stretched method using optical fiber at 1050 nm [5]. A 40 MHz swept source was developed using time stretch combined with all-normal dispersion (ANDi) supercontinuum dynamics [6].…”

Section: Introductionmentioning

confidence: 99%

“…A 40 MHz swept source was developed using time stretch combined with all-normal dispersion (ANDi) supercontinuum dynamics [6]. Using this source, OCT imaging at high speed was demonstrated [5,7]. However, the output power of the swept source was limited due to the high losses in the stretcher and a regenerative ytterbium dopped fiber amplifier was needed.…”

Section: Introductionmentioning

confidence: 99%

Towards sub-5 µm axial resolution OCT from a multi-MHz swept source

Grelet

Montague

Podoleanu

2023

High-Speed Biomedical Imaging and Spectroscopy VIII

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We present an ultrafast swept source for optical coherence tomography (OCT) at a central wavelength of 1050 nm with a 86 nm bandwidth. Based on low noise supercontinuum dynamics and time stretch, this akinetic swept source operates at 10 MHz. The fast sweep rate and the low noise of the source enable high-speed imaging at a wavelength suitable for biological tissue (eye, skin). Such a light source presents a significant potential in achieving a large bandwidth beyond the limitations of current high-speed swept-source technologies.

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Downconversion Master Slave OCT With a Bidirectional Sweeping Laser

Martinez Jimenez,

Cernat,

Bradu

et al. 2024

Journal of Biophotonics

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This paper explores the challenges of signal processing when using optical coherence tomography (OCT) imaging instruments driven by asymmetric MHz bidirectional sweeping lasers. A downconversion master–slave (DMS) method is proposed as a viable alternative to the traditional OCT protocol. Unlike conventional swept source OCT, which requires a separate calibration for each sweep, the DMS approach does not require calibration of the acquired channeled spectra; its operation is independent of the tuning direction. We demonstrate the practicality of the DMS method with en‐face OCT images obtained with an OCT instrument equipped with a fast bidirectional swept laser (tuning speed 1.6 MHz) and a slow acquisition card of only 2.5 MS/s sampling rate.

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40 MHz Swept-Source Optical Coherence Tomography at 1060 nm Using a Time-Stretch and Supercontinuum Spectral Broadening Dynamics

Cited by 4 publications

References 31 publications

Dual ultrahigh speed swept-source and time domain optical coherence tomography system using a time stretch laser and a KTN deflector

Dual ultrahigh speed swept-source and time domain optical coherence tomography system using a time stretch laser and a KTN deflector

Towards sub-5 µm axial resolution OCT from a multi-MHz swept source

Downconversion Master Slave OCT With a Bidirectional Sweeping Laser

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