Time domain discrete Fourier domain mode locked laser with k-space uniform comb lines

Abstract Various nonequilibrium multi-pulse states can emerge in a mode-locked laser through interactions between the quasi-continuous-wave background (qCWB) and pulses inside the laser cavity. While they have been regarded as unpredictable and hardly controllable due to the noise-like nature of qCWB, we here demonstrate that the qCWB landscape can be manipulated via optoacoustically mediated pulse-to-qCWB interactions, which alters the behaviors of multi-pulse dynamics. In this process, impulsive qCWB modulations are created at well-defined temporal locations, which act as the point emitters and attractive potentials for drifting pulse bunches and soliton rains. Hence, we can transport a single pulse bunch from a certain temporal position to another, and also make soliton rains created and collided exclusively at specific temporal locations. Our study opens up possibilities to control the nonequilibrium multi-pulse phenomena precisely in the time domain, which would offer a practical means of advanced optical information processing.

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Comparison of Fourier-Domain and Time-Domain Optical Coherence Tomography in the Measurement of Thinnest Corneal Thickness in Keratoconus

Journal of Ophthalmology ◽

10.1155/2015/402925 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

Chunxiao Wang ◽

Xueying Xia ◽

Bishan Tian ◽

Shiyou Zhou

Keyword(s):

Optical Coherence Tomography ◽

Time Domain ◽

Pearson Correlation ◽

Corneal Thickness ◽

Intraclass Correlation ◽

Fourier Domain ◽

Optical Coherence ◽

Highly Correlated ◽

Time Domain Oct

Objective. To compare fourier-domain optical coherence tomography (FD-OCT) and time-domain OCT (TD-OCT) in the determination of thinnest corneal thickness (TCT).Methods. This study included 55 keratoconus patients and 50 healthy volunteers. The RTVue-OCT (FD-OCT) and Visante-OCT (TD-OCT) were used for the measurement of the TCT. Three consecutive scans were performed. The comparison and agreement between the two modalities were analyzed by pairedt-test, the Pearson correlation, intraclass correlation coefficient (ICC), and Bland-Altman plots. intraobserver repeatability was analyzed by the intraobserver within-subject standard deviation (S(w)), coefficient of variation (CV(w)), and ICC.Results. The TCT value of normal corneas was higher by RTVue-OCT (530.4 ± 19.7 μm) than Visante-OCT (521.5 ± 18.3 μm) (p<0.001). For keratoconus eyes, the TCT was 425.0 ± 58.2 μm and 424.4 ± 55.7 μm (difference being 0.6 ± 10.2 μm,p=0.604). Strong correlation (r= 0.938∼0.985) (ICC = 0.915–0.984) was observed between the two OCTs, and each OCT exhibited excellent repeatability in determining the TCT in all subjects (ICC = 0.984–0.994).Conclusions. The values of TCT obtained from RTVue-OCT and Visante-OCT were highly correlated; however, the two values were different. Both OCT instruments exhibited good intraobserver reliability. The existence of systematic differences suggested that the two instruments cannot be used interchangeably.

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Comparison of Spectralis Fourier-domain optical coherence tomography (OCT) and time-domain Stratus OCT for the evaluation of macular thickness in patients with diabetes mellitus type 2

Acta Ophthalmologica ◽

10.1111/j.1755-3768.2009.442.x ◽

2009 ◽

Vol 87 ◽

pp. 0-0

Author(s):

L GIL ARRIBAS ◽

M IDOIPE ◽

E GARCIA MARTIN ◽

I PINILLA ◽

I FUERTES

Keyword(s):

Diabetes Mellitus ◽

Optical Coherence Tomography ◽

Time Domain ◽

Diabetes Mellitus Type 2 ◽

Macular Thickness ◽

Fourier Domain ◽

Optical Coherence ◽

Patients With Diabetes ◽

Stratus Oct

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Hybrid Fourier-domain mode-locked laser for ultra-wideband linearly chirped microwave waveform generation

Nature Communications ◽

10.1038/s41467-020-17264-8 ◽

2020 ◽

Vol 11 (1) ◽

Cited By ~ 2

Author(s):

Jian Tang ◽

Beibei Zhu ◽

Weifeng Zhang ◽

Ming Li ◽

Shilong Pan ◽

...

Keyword(s):

Ultra Wideband ◽

Fourier Domain ◽

Waveform Generation ◽

Mode Locked Laser

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Comparison of Retinal Nerve Fiber Layer Thickness Measurements in Healthy Subjects Using Fourier and Time Domain Optical Coherence Tomography

Journal of Ophthalmology ◽

10.1155/2012/107053 ◽

2012 ◽

Vol 2012 ◽

pp. 1-6 ◽

Cited By ~ 4

Author(s):

Isabel Pinilla ◽

Elena Garcia-Martin ◽

Miriam Idoipe ◽

Eva Sancho ◽

Isabel Fuertes

Keyword(s):

Nerve Fiber ◽

Retinal Nerve Fiber Layer ◽

Time Domain ◽

Healthy Subjects ◽

Fourier Domain ◽

Average Thickness ◽

Fiber Layer ◽

Nerve Fiber Layer ◽

Fourier Domain Oct ◽

Time Domain Oct

Purpose. To compare the retinal nerve fiber layer (RNFL) measurements using two different ocular coherence tomography (OCT) devices: Cirrus Fourier domain OCT and Stratus time domain OCT. To analyze reproducibility of Fourier domain measurements in healthy subjects.Methods. One hundred and thirty-two eyes of 132 healthy subjects were scaned on the same day with both instruments, separated by 10 minutes from each other. Thickness of quadrant, average and the 12 different areas around the optic nerve were compared between Cirrus and Stratus. Repeatability, intraclass correlation coefficients (ICCs), and coefficients of variation (COVs) were calculated in RNFL measurements provided by Fourier domain device.Results. The average thickness in the optic cube was 95.50 μm using Cirrus and 97.85 μm using Stratus. Average thickness and temporal quadrant showed significant differences using Cirrus and Stratus methods. Reproducibility was better with Fourier domain OCT (mean COV of 4.54%) than with Stratus time-domain OCT (mean COV of 5.57%).Conclusions. Both scan options give reproducible RNFL thickness measurement, but there are differences between them. Measurements obtained using Fourier domain device show better reproducibility.

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