Upconversion: imaging with planar and spherical pump beams

Area of Science:

• Nonlinear optics
• Quantum optics
• Photonics

Background:

• Nonlinear optical processes enable frequency conversion.
• Image upconversion offers enhanced sensitivity in imaging.
• Understanding pump beam effects is crucial for optimizing upconversion.

Purpose of the Study:

• To investigate and compare the imaging properties of nonlinear image upconverters using planar and spherical pump beams.
• To demonstrate the applicability of Fourier transform formalism and holographic analogy for spherical pump beams.
• To present and discuss experimental results of upconversion with spherical pump beams.

Main Methods:

• Theoretical analysis using Fourier transform formalism.
• Application of holographic analogy for spherical pump beam characterization.
• Experimental setup for nonlinear image upconversion.

Main Results:

• The Fourier transform formalism and holographic analogy are applicable to spherical pump beams in nonlinear image upconversion.
• Experimental validation of upconversion with spherical pump beams was achieved.
• Imaging properties were analyzed for both planar and spherical pump beam configurations.

Conclusions:

• Spherical pump beams offer unique properties for nonlinear image upconversion.
• The theoretical frameworks discussed provide valuable tools for analyzing upconversion processes.
• Experimental results confirm the feasibility and characteristics of upconversion with spherical pump beams.