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Higher-order Kerr effect and harmonic cascading in gases
Morten Bache1, Falk Eilenberger, Stefano Minardi
1DTU Fotonik, Department of Photonics Engineering, Technical University of Denmark, Lyngby DK-2800 Kgs, Denmark. moba@fotonik.dtu.dk
Optics Letters
|November 21, 2012
Summary
Cascaded third-harmonic generation creates a significant fifth-order nonlinearity, impacting the higher-order Kerr effect (HOKE) in gases. This cascading effect alters HOKE saturation intensity differently based on wavelength.
Area of Science:
- Nonlinear optics
- Quantum optics
- Laser physics
Background:
- The higher-order Kerr effect (HOKE) is proposed to explain nonlinear refractive index saturation in gases.
- Understanding nonlinear optical phenomena is crucial for advanced laser applications.
Purpose of the Study:
- To investigate the influence of cascaded nonlinear processes on HOKE.
- To determine the impact of third-harmonic generation cascading on the nonlinear refractive index.
Main Methods:
- Theoretical analysis of nonlinear optical phenomena.
- Modeling of cascaded third-harmonic generation.
- Examination of higher-order harmonic cascading effects.
Main Results:
- Cascaded third-harmonic generation generates a significant, negative effective fifth-order nonlinearity.
- Higher-order harmonic cascading from HOKE modifies the observed nonlinear index change.
- Wavelength-dependent effects of cascading on HOKE saturation intensity were identified.
Conclusions:
- Cascading effects must be considered for accurate HOKE measurements.
- The study reveals a new mechanism influencing nonlinear refractive index saturation in gases.
- Findings have implications for controlling and predicting nonlinear optical responses in various media.
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