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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High-intensity third-harmonic generation in beta barium borate through second-order and third-order susceptibilities
P S Banks1, M D Feit, M D Perry
1Laser Program, Lawrence Livermore National Laboratory, L-477, P.O. Box 808, Livermore, California 94550, USA.
Optics Letters
|December 12, 2007
Summary
Researchers measured nonlinear optical effects in beta-barium borate to understand third-harmonic generation. This study quantifies tensor elements and achieves high conversion efficiencies up to 6% using femtosecond lasers.
Area of Science:
- Nonlinear optics
- Materials science
- Laser physics
Background:
- Third-harmonic generation (THG) is crucial for frequency conversion in nonlinear optical processes.
- Understanding the contributions of third-order and cascaded second-order nonlinearities is essential for optimizing THG.
- Beta-barium borate (BBO) is a widely used nonlinear optical crystal.
Purpose of the Study:
- To measure the relative contributions of third-order and cascaded second-order nonlinear coupling to direct THG in BBO.
- To determine the values of specific third-order nonlinear susceptibility tensor elements (χ(3)) relative to known second-order elements (χ(2)).
Main Methods:
- Utilized the azimuthal dependence of nonlinear coupling.
- Employed a femtosecond chirped-pulse amplification laser system.
- Performed measurements in collimated beams with high peak power densities (200 GW/cm²).
Main Results:
- Successfully measured the relative contributions of different nonlinear processes to THG.
- Determined the values of tensor elements χ(3)(10), χ(3)(11), and χ(3)(16) in BBO.
- Achieved high THG conversion efficiencies, reaching up to 6%.
Conclusions:
- The study provides a method for disentangling nonlinear contributions to THG.
- The quantified tensor elements are valuable for theoretical modeling and material design.
- High conversion efficiencies demonstrate the potential of BBO for advanced laser applications.
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