Novel nonlinear phenomena

Agrawal, Govind P.

doi:10.1016/b978-0-12-817042-7.00019-1

Cited by 2 publications

(1 citation statement)

References 173 publications

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“…Asynchronization has been shown to occur between different spectral channels of the FWHSL. Such asynchronization is mainly caused by the inherent characteristics of the supercontinuum laser source, indicating that each wavelength is not strictly synchronized (i.e., they have a slightly different timing at the beginning of transmission) [18,19]. With an increase in wavelength, the laser pulse emission time occurred earlier, and the maximum difference time of the pulse is hundreds of picoseconds.…”

Section: Introductionmentioning

confidence: 99%

Calibration of the Pulse Signal Decay Effect of Full-Waveform Hyperspectral LiDAR

Zhang

Gao

Niu

et al. 2019

Sensors

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Full-waveform hyperspectral LiDAR (FWHSL) is able to obtain spectral and spatial information by utilizing a single instrument, and it has become more and more commonly used in vertical distribution studies of structural and biochemical characteristics of vegetation. However, the pulse-echo arrival times of multiple spectral channels of the FWHSL are not consistent and this causes range ambiguity in spectral channels. In this paper, the pulse signal decay effect on range measurements was studied by measuring the varying trends of pulse signal decay between spectral channels with different material properties. The experiments were repeated at different distances. All of the spectral channels were compared for different materials. The results suggest that the channels in the red edge spectral region of vegetation have good stability and accuracy for range measurements of varied distance and materials properties. Finally, based on the geometric invariability in a specific red edge channel, a practical calibration approach for the pulse signal decay effect is also presented. The validation tests showed it could improve the pulse signal decay effect of full-waveform hyperspectral LiDAR.

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Section: Introductionmentioning

confidence: 99%

Calibration of the Pulse Signal Decay Effect of Full-Waveform Hyperspectral LiDAR

Zhang

Gao

Niu

et al. 2019

Sensors

View full text Add to dashboard Cite

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Supercontinuum generation in single-crystal YAG fibers pumped around the zero-dispersion wavelength

et al. 2021

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Yttrium aluminum garnet (YAG) is a common host material for both bulk and single-crystal fiber lasers. With increasing interest in developing optical technologies in the short-wave infrared and mid-infrared wavelength range, YAG may be a potential supercontinuum medium for these applications. Here, we characterize femtosecond laser pumped supercontinuum generation with 1200–2000 nm pump wavelengths ( λ p ) for undoped, single-crystal YAG fibers, which are representative of the normal, zero, and anomalous-dispersion regimes. Supercontinuum was observed over the spectral region of about 0.2 to 1.6 λ p . Z-scan measurements were also performed of bulk YAG, which revealed little dispersion of the nonlinear index of refraction ( n 2 ) in the region of interest. The measured values of n 2 ( ∼ 1 × 10 − 6 c m 2 / G W ) indicate a regime in which the nonlinear length, L N L , is less than the dispersion length, L D , ( L N L ≪ L D ). We report intensity clamping of the generated filament in the normal group velocity dispersion (GVD) regime and an isolated anti-Stokes peak in the anomalous GVD regime, suggesting further consideration is needed to optimize supercontinuum generation in this fiber medium.

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Novel nonlinear phenomena

Cited by 2 publications

References 173 publications

Calibration of the Pulse Signal Decay Effect of Full-Waveform Hyperspectral LiDAR

Calibration of the Pulse Signal Decay Effect of Full-Waveform Hyperspectral LiDAR

Supercontinuum generation in single-crystal YAG fibers pumped around the zero-dispersion wavelength

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