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Efficient high-harmonic generation in engineered quasi-phase matching gratings.

Usman K Sapaev¹, Gaetano Assanto

¹Nonlinear Optics and OptoElectronics Lab, INFN & CNISM, University Roma Tre Via della Vasca Navale 84, 00146, Rome- Italy.

|June 4, 2008

Summary

We created a numerical algorithm for designing engineered quasi-phase-matching gratings. This method efficiently generates higher-order harmonics from a fundamental frequency in nonlinear crystals like lithium niobate.

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Area of Science:

Nonlinear optics
Materials science

Background:

Quasi-phase-matching (QPM) is crucial for efficient nonlinear frequency conversion.
Designing QPM gratings for higher-order harmonic generation presents significant challenges.

Purpose of the Study:

To develop an effective numerical algorithm for designing engineered QPM gratings.
To enable parametric generation of arbitrary-order harmonics from a fundamental frequency input.

Main Methods:

Development of a numerical algorithm for grating design.
Application of the algorithm to lithium niobate crystals.
Utilizing a continuous-wave (CW) laser source.
Operating in the pump depletion regime.

Main Results:

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Successful design of engineered QPM gratings.
Demonstration of parametric generation of higher-order harmonics.
Effective performance in lithium niobate with CW excitation and pump depletion.

Conclusions:

The developed numerical algorithm is effective for designing engineered QPM gratings.
The method facilitates efficient parametric generation of arbitrary-order harmonics.
The approach is validated in lithium niobate under specific experimental conditions.