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Seeing infrared optical vortex arrays with a nonlinear spiral phase filter
Optics Letters
|May 2, 2019
Summary
Researchers developed a novel method for detecting infrared optical vortex arrays using simultaneous up-conversion imaging and second-harmonic generation (SHG). This technique efficiently converts invisible infrared vortices into visible light, revealing their positions and topological charges.
Area of Science:
- Optics and Photonics
- Nonlinear Optics
- Infrared Imaging
Background:
- Optical vortex arrays are crucial for advanced optical manipulation and information processing.
- Detecting invisible infrared vortex arrays presents significant challenges in imaging and monitoring applications.
Purpose of the Study:
- To demonstrate an efficient and novel method for detecting infrared optical vortex arrays.
- To enable simultaneous up-conversion imaging and spiral phase contrast for infrared vortex detection.
Main Methods:
- Utilized second-harmonic generation (SHG) in the Fourier domain for simultaneous up-conversion and spiral phase contrast.
- Employed a spatial light modulator to generate 1064 nm structured vortex arrays.
- Used a nonlinear orbital angular momentum (OAM) filter with a type-II potassium titanyl phosphate crystal to mix Fourier spectra and generate visible SHG light fields.
Main Results:
- Successfully converted invisible infrared vortex arrays into visible SHG light fields.
- Vortex cores were visualized as bright Gaussian spots, accurately revealing their positions and topological charges.
- Demonstrated efficient detection of infrared optical vortex arrays.
Conclusions:
- The developed SHG-based method offers an efficient approach for detecting infrared optical vortex arrays.
- This technique has potential applications in infrared imaging, monitoring, and optical manipulation.
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