Measuring the spatio-temporal field of diffracting ultrashort pulses

Numerical models of the heat index time series and spatio-temporal fields can be used for a variety of purposes, from the study of the dynamics of heat waves to projections of the influence of future climate on humans. To conduct these studies one must have efficient numerical models that successfully reproduce key features of the real weather processes. In this study, 2 numerical stochastic models of the spatio-temporal non-Gaussian field of the average daily heat index (ADHI) are considered. The field is simulated on an irregular grid determined by the location of weather stations. The first model is based on the method of the inverse distribution function. The second model is constructed using the normalization method. Real data collected at weather stations located in southern Russia are used to both determine the input parameters and to verify the proposed models. It is shown that the first model reproduces the properties of the real field of the ADHI more precisely compared to the second one, but the numerical implementation of the first model is significantly more time consuming. In the future, it is intended to transform the models presented to a numerical model of the conditional spatio-temporal field of the ADHI defined on a dense spatio-temporal grid and to use the model constructed for the stochastic forecasting of the heat index.

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Integrated structured light architectures

Scientific Reports ◽

10.1038/s41598-020-80502-y ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Randy Lemons ◽

Wei Liu ◽

Josef C. Frisch ◽

Alan Fry ◽

Joseph Robinson ◽

...

Keyword(s):

Degrees Of Freedom ◽

Temporal Distribution ◽

Multiple Degrees Of Freedom ◽

Beam Combination ◽

Angular Momenta ◽

Field Control ◽

Topological States ◽

Spatio Temporal ◽

Temporal Field ◽

Structural Versatility

AbstractThe structural versatility of light underpins an outstanding collection of optical phenomena where both geometrical and topological states of light can dictate how matter will respond or display. Light possesses multiple degrees of freedom such as amplitude, and linear, spin angular, and orbital angular momenta, but the ability to adaptively engineer the spatio-temporal distribution of all these characteristics is primarily curtailed by technologies used to impose any desired structure to light. We demonstrate a laser architecture based on coherent beam combination offering integrated spatio-temporal field control and programmability, thereby presenting unique opportunities for generating light by design to exploit its topology.

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