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Diffraction from two-photon-excited thermal index gratings.

D J McGraw, J M Harris

|September 3, 2009

Summary

Two-photon absorption creates unique volume gratings with distinct decay rates. Comparing diffracted orders helps determine the excitation process order, differentiating it from linear methods.

Area of Science:

Optics and Photonics
Materials Science

Background:

Linear excitation methods can lead to complex gratings.
Understanding nonlinear optical processes is crucial for advanced material fabrication.

Purpose of the Study:

To investigate the characteristics of volume gratings formed by two-photon absorption.
To differentiate two-photon excitation from linear excitation using diffraction analysis.

Main Methods:

Utilizing crossed Gaussian laser beams for two-photon absorption.
Creating volume gratings with primary and second-order sinusoidal index modulation.
Analyzing Bragg diffraction peaks and their decay rates.

Main Results:

Two-photon absorption generated gratings with both primary and second-order modulation.

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Unlike linear excitation, two-photon gratings showed two distinct Bragg diffraction peaks.

These peaks exhibited different decay rates, providing a unique signature.

Conclusions:

The distinct decay rates of diffraction peaks serve as a signature for two-photon excitation.
Comparing diffracted orders from volume gratings is a reliable method to determine the excitation process order.