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Ultrafast ghost imaging with 25 GHz speckle switching and wavelength-division multiplexing.
Optics Express
|July 2, 2026
Summary
Ultrafast ghost imaging (GI) achieves over 15 gigapixels per second using 25 GHz pattern switching. This breakthrough enables high-speed imaging, capturing microsecond events beyond conventional camera limits.
Area of Science:
- Optics and Photonics
- Computational Imaging
- Advanced Sensor Technologies
Background:
- Ghost imaging (GI) and single-pixel imaging (SPI) reconstruct images without spatially resolved detectors, enabling imaging across diverse spectra and environments.
- A key limitation of GI and SPI is the slow pattern switching speed, restricting achievable frame rates and hindering applications requiring high temporal resolution.
Purpose of the Study:
- To overcome the frame rate limitations of ghost imaging and single-pixel imaging.
- To develop an ultrafast ghost imaging technique capable of capturing microsecond-scale dynamic events.
Main Methods:
- Demonstrated ultrafast ghost imaging utilizing 25 GHz speckle pattern switching.
- Incorporated wavelength-division multiplexing (WDM) for parallelized illumination and enhanced throughput.
- Achieved a spatial-temporal information flux exceeding 15.68 gigapixels per second.
Main Results:
- Reconstructed 28x28-pixel images with a 10 ns exposure time, achieving 100 megaframes per second (Mfps).
- Exceeded previous training-data-free GI approaches by over two orders of magnitude in speed.
- Successfully captured microsecond-scale dynamic events.
Conclusions:
- The developed ultrafast GI technique significantly advances imaging capabilities for rapid processes.
- This method surpasses the limitations of conventional cameras in terms of detector bandwidth, readout speed, and cost.
- Opens new avenues for studying ultrafast phenomena in various scientific and industrial fields.
