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Elliptically polarized sum-frequency generation by total-internal-reflection-based optical rotation
Applied Optics
|April 26, 2022
Summary
This study demonstrates efficient elliptically polarized radiation generation using a novel optical rotation quasi-phase-matching technique in a lithium niobate crystal. The method achieves high conversion efficiency for sum-frequency generation, controlled by an external electric field.
Area of Science:
- Nonlinear Optics
- Materials Science
Background:
- Sum-frequency generation (SFG) is a key nonlinear optical process.
- Controlling polarization states in nonlinear processes is crucial for advanced applications.
- Lithium niobate (LiNbO3) is a widely used material in nonlinear optics.
Purpose of the Study:
- To demonstrate elliptically polarized radiation generation via sum-frequency generation.
- To utilize total-internal-reflection-based optical rotation quasi-phase-matching (OR-QPM).
- To investigate the effect of an external electric field on polarization control.
Main Methods:
- Employed a Y2O3-coated, MgO-doped LiNbO3 crystal for SFG.
- Utilized total internal reflection (TIR) and OR-QPM for polarization control.
- Incorporated computer-aided simulations including limiting factors like absorption and surface roughness.
Main Results:
- Achieved high conversion efficiency of 7.5%/W/cm.
- Simulated the generation of 770 nm wavelength radiation.
- Demonstrated control over phase shifts for p- and s-polarized light propagation.
Conclusions:
- The OR-QPM technique enables efficient generation of elliptically polarized light in LiNbO3.
- External electric fields can be used to tune polarization properties.
- The study provides a pathway for efficient nonlinear optical signal generation with tailored polarization states.
