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Single-shot ultrafast burst imaging using an integral field spectroscope with a microlens array.

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We developed Lens Array-Sequentially Timed All-Optical Mapping Photography (LA-STAMP) for faster, higher-throughput hyperspectral imaging. This technique captures dynamic events, like laser ablation, with high temporal and spatial resolution.

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Area of Science:

Optics and Photonics
Spectroscopy
Materials Science

Background:

Sequentially Timed All-Optical Mapping Photography (STAMP) enables high-speed imaging of dynamic processes.
Previous STAMP methods using spectral filtering had limited optical throughput.
Advanced optical techniques are needed to capture ultrafast phenomena with greater detail.

Purpose of the Study:

To introduce and demonstrate the Lens Array-STAMP (LA-STAMP) technique for enhanced hyperspectral imaging.
To improve the optical throughput of STAMP for capturing dynamic events.
To achieve high temporal and spatial resolution in single-shot burst imaging.

Main Methods:

Integral Field Spectroscopy (IFS) using a microlens array (MLA) to generate hyperspectral images.
A free-space angular-chirp-enhanced delay optical layout for probe laser pulses.
Single-shot burst imaging of femtosecond laser-induced ablation on a glass surface.

Main Results:

LA-STAMP achieved significantly higher optical throughput compared to spectral filtering methods.
Demonstrated single-shot burst imaging with 300 ps frame intervals over a 1.8 ns window.
Achieved a spatial resolution of approximately 4.4 µm, with potential for ~1 µm resolution.

Conclusions:

LA-STAMP offers a superior method for high-speed, high-resolution hyperspectral imaging.
The technique is effective for studying ultrafast dynamic processes like laser ablation.
LA-STAMP has potential for further development with finer pitch microlens arrays for even higher resolution.