Group-velocity dispersion measurements of water, seawater, and ocular components using multiphoton intrapulse interference phase scan

Coello, Yves; Xu, Bingwei; Miller, Tricia L.; Lozovoy, Vadim V.; Dantus, Marcos

doi:10.1364/ao.46.008394

Cited by 39 publications

(22 citation statements)

References 22 publications

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“…For comparison with previous measurements in the literature, Fig. 4 in [24] shows the measured fs 2 of deionized water using several different path lengths; much like the present measurement, they best-fit a polynomial to the detection bandwidth. After fitting along the detection bandwidth, they best-fit a line through different path lengths as shown in Fig.…”

Section: Experimental Demonstration Of Spearsupporting

confidence: 62%

“…MIIPS is a simple and highly accurate integrated method for pulse compression that only requires a pulse shaper that can perform phase shaping. Its accuracy makes it an excellent way to measure the group-delay dispersion (GDD) of a material [24]. A relatively large number of pulse shapes-on the order of one hundred-are needed to measure a MIIPS trace.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of pulse compression methods using only a pulse shaper

Wilcox¹,

Ogilvie²

2014

J. Opt. Soc. Am. B

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Spectral phase compensation is crucial in the production of ultrafast laser pulses. To produce very short pulses, it is necessary to correct higher-order phase terms beyond the typical second-order and third-order corrections. It is helpful to have a pulse shaper to perform the compression, and to use an integrated, deterministic pulse-shaperonly method for pulse compression and characterization. While several algorithms exist for this purpose, it is desirable to know which method is optimal. Using a computer simulation, we investigate the speed of several existing approaches in several typical pulse shaping cases. We also present and demonstrate experimentally a new method named Spectral Phase of Electric field by Analytic Reconstruction (SPEAR), a variant of the Chirp Reversal Technique (CRT). The chirp-scan method, CRT, and SPEAR are found to be the fastest methods to achieve a desired level of accuracy, for the cases investigated.

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Section: Experimental Demonstration Of Spearsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Comparison of pulse compression methods using only a pulse shaper

Wilcox¹,

Ogilvie²

2014

J. Opt. Soc. Am. B

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“…33 To assess the influence of the group velocity dispersion (GVD) in water on the beam dynamics we estimated the dispersion length L d = τ 2 /(∂ 2 k/∂ 2 ω) ≈ 5 cm with τ = 50 fs and GVD = (∂ 2 k/∂ 2 ω) = 2.5 × 10 4 fs 2 /m. 34 Since this length is significantly longer than the self-focusing length ∼2cm for the central peak of the incident beam, the dispersion should play comparatively minor role at our conditions. Also other nonlinear processes (like multiphoton absorption 14 ) can contribute to balancing the nonlinear effects for filament stabilization until the energy of the pulse is depleted.…”

Section: Experimental Details Results and Discussionmentioning

confidence: 87%

Extension of filament propagation in water with Bessel-Gaussian beams

Kaya

Sayrac

et al. 2016

AIP Advances

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We experimentally studied intense femtosecond pulse filamentation and propagation in water for Bessel-Gaussian beams with different numbers of radial modal lobes. The transverse modes of the incident Bessel-Gaussian beam were created from a Gaussian beam of a Ti:sapphire laser system by using computer generated hologram techniques. We found that filament propagation length increased with increasing number of lobes under the conditions of the same peak intensity, pulse duration, and the size of the central peak of the incident beam, suggesting that the radial modal lobes may serve as an energy reservoir for the filaments formed by the central intensity peak.

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“…The pulsed laser used in this study emitted ~55 fs pulses. Due to the chromatic dispersion properties of refractive elements in the optical setup and the eye itself [59], any pulse delivered to the retina is blurred in time [60]. The shorter the pulse duration, the broader the spectral bandwidth, and thus the stronger the blur.…”

Section: Comparison Of Exposures To Damage Thresholds and Current Safmentioning

confidence: 99%

“…We are not yet able to measure the pulse duration at the retina. However, based on ex vivo measurements on bovine eyes [60], the pulse duration can be expected to be shorter than 100 fs. In the sub-100 fs pulse regime, nonlinear optical effects such as self-focusing and plasma formation cannot be neglected [41,61].…”

Section: Comparison Of Exposures To Damage Thresholds and Current Safmentioning

confidence: 99%

Safety assessment in macaques of light exposures for functional two-photon ophthalmoscopy in humans

Schwarz¹,

Sharma²,

Fischer³

et al. 2016

Biomed. Opt. Express

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Two-photon ophthalmoscopy has potential for in vivo assessment of function of normal and diseased retina. However, light safety of the sub-100 fs laser typically used is a major concern and safety standards are not well established. To test the feasibility of safe in vivo two-photon excitation fluorescence (TPEF) imaging of photoreceptors in humans, we examined the effects of ultrashort pulsed light and the required light levels with a variety of clinical and high resolution imaging methods in macaques. The only measure that revealed a significant effect due to exposure to pulsed light within existing safety standards was infrared autofluorescence (IRAF) intensity. No other structural or functional alterations were detected by other imaging techniques for any of the exposures. Photoreceptors and retinal pigment epithelium appeared normal in adaptive optics images. No effect of repeated exposures on TPEF time course was detected, suggesting that visual cycle function was maintained. If IRAF reduction is hazardous, it is the only hurdle to applying two-photon retinal imaging in humans. To date, no harmful effects of IRAF reduction have been detected.

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Group-velocity dispersion measurements of water, seawater, and ocular components using multiphoton intrapulse interference phase scan

Cited by 39 publications

References 22 publications

Comparison of pulse compression methods using only a pulse shaper

Comparison of pulse compression methods using only a pulse shaper

Extension of filament propagation in water with Bessel-Gaussian beams

Safety assessment in macaques of light exposures for functional two-photon ophthalmoscopy in humans

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