In optics, group-velocity dispersion (GVD) is a characteristic of a dispersive medium, used most often to determine how the medium affects the duration of an optical pulse traveling through it. Formally, GVD is defined as the derivative of the inverse of group velocity of light in a material with respect to angular frequency , [ 1 ] [ 2 ]

Oct 1, 2021 · Second-line therapy with pembro-GVD is a highly effective and well-tolerated regimen that can efficiently bridge patients with rel/ref cHL to HDT/AHCT.

Nov 3, 2021 · Complete response (CR) attained on fluorodeoxyglucose-positron emission tomography (FDG-PET) or FDG-computer tomography (FDG-CT) before HDT/AHCT is considered a strong positive prognostic factor for long-term outcomes in patients with R/R cHL.

Mar 21, 2024 · The GVD Formula. The group velocity dispersion is determined by the rate of change of group velocity with respect to the angular frequency (ω) of the wave. Mathematically, GVD is expressed as: β 2 = -\frac{d^2β}{dω^2} where β represents the propagation constant, and β 2 is the GVD parameter. The negative sign indicates that higher ...

Second-line pembrolizuab plus intravenous (IV) gemcitabine, vinorelbine, and liposomal doxorubicin (pembro-GVD) led to high complete response (CR) rates in patients with relapsed/refractory classical Hodgkin lymphoma (cHL) and successfully bridged many of these patients to high-dose therapy and autologous hematopoietic cell transplantation (HDT ...

Mar 11, 2023 · Group velocity dispersion (GVD) is a phenomenon where the group velocity varies with frequency, different frequencies in the wave packet move at different speeds. It's quantified by the second derivative of angular frequency with respect to wave number: \[ GVD = \frac{d^2\omega}{dk^2} \].

As the group velocity is given as the first derivative of phase velocity with respect to frequency, the group velocity dispersion (GVD) (GVD) is the derivative of the inverse group velocity with respect to frequency: (2)GVD = ∂ ∂ω(1 vg)= ∂ ∂ω(∂k ∂ω)= ∂2k ∂ω2 GVD = ∂ ∂ ω (1 v g) = ∂ ∂ ω (∂ k ∂ ω) = ∂ 2 k ∂ ω 2.

Sep 15, 2021 · From my book I read "The group velocity dispersion (GVD) is given by the dependence of $v_g$ from $\omega$: inside the envelope, different frequencies moves at different velocity and this is the cause of the time broadening of the pulse". If velocities are different, why the pulse isn't broadening?

Oct 30, 2023 · Most information I read on the topic tells me something like this: "GVD means that the group velocity will be different for different wavelengths in the pulse. Thus, in ultrashort pulses with broad bandwidth, pulse spreading can cause red (larger wavelength) to lead blue (smaller wavelength) as the pulse spreads."

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