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Effect of object thickness on ultrashort pulse diffraction.

Andrey V Belashov, Maksim S Kulya, Nikolay S Balbekin

|December 25, 2019

Summary

Simulating ultrashort pulse diffraction requires accounting for object thickness. Our new algorithm improves accuracy by considering finite object thickness, revealing discrepancies in traditional methods for pulsed radiation.

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Area of Science:

Optics and Photonics
Computational Physics

Background:

Spectral domain calculations for ultrashort pulse propagation can be inaccurate due to object thickness.
Time domain interactions of ultrashort pulses depend on their longitudinal coordinate.

Purpose of the Study:

To develop and validate an algorithm for simulating ultrashort pulse diffraction on finite-thickness objects.
To quantify the inaccuracy of traditional methods and analyze the impact of object thickness and beam properties.

Main Methods:

A stepwise simulation approach for ultrashort pulse diffraction on apertures and scatterers of finite thickness.
Comparison of results from the proposed algorithm with traditional wavefield calculations.

Main Results:

The proposed algorithm confirms applicability and convergence with reduced simulation steps.
A ~7% discrepancy was observed for 800 nm pulsed radiation on a 1 mm thick object compared to traditional methods.
The mismatch depends on object thickness and is more pronounced for non-Gaussian vortex beams.

Conclusions:

The finite thickness of diffracting objects significantly impacts ultrashort pulse propagation simulations.
Traditional single-layer object representations can lead to inaccuracies, especially for thicker or complex objects.
Spatiotemporal coupling effects are also influenced by the simulation approach used for pulse-object interaction.