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Updated: Jun 9, 2026
11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
[Third harmonic enhancement and spectral analysis within plasma channel based on pump-probe effect]
Yan-ling Wang1, Hong Wu, Liang-en Ding
1State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062, China.
Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|September 11, 2010
Summary
This study demonstrates significant third harmonic enhancement using a pump-probe effect in dual plasma channels. This method overcomes intensity clamping limitations, achieving up to a 70-fold increase in harmonic energy.
Area of Science:
- Nonlinear Optics
- Ultrafast Laser Science
- Plasma Physics
Context:
- Harmonic generation in nonlinear media is crucial for frequency conversion.
- Intensity clamping in single filamentation limits harmonic enhancement.
- Plasma channels offer a unique medium for nonlinear optical interactions.
Purpose:
- To investigate third harmonic enhancement using non-collinear dual plasma channels.
- To explore the pump-probe effect for overcoming intensity clamping limitations.
- To optimize parameters for maximizing harmonic energy and spectral bandwidth.
Summary:
- Dual plasma channels were generated by non-collinearly focusing two ultrafast laser pulses (4.4 mJ and 10.2 mJ, 60 fs, 810 nm) in air.
- A pump-probe configuration, with the stronger beam preceding the weaker one, modulated the probe beam, significantly enhancing third harmonic generation.
- Optimal conditions involved a 27.3 mrad intersection angle, 15 mm before focus, and a 55 fs delay, yielding a ~70-fold energy increase and a 5 nm spectral bandwidth.
Impact:
- Achieved significant enhancement of third harmonic generation, overcoming previous limitations.
- Demonstrated a novel pump-probe method utilizing dual plasma channels for nonlinear frequency conversion.
- Provides insights into controlling ultrafast laser-plasma interactions for advanced harmonic generation techniques.
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