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Waveforms for optimal sub-keV high-order harmonics with synthesized two- or three-colour laser fields.
Cheng Jin1, Guoli Wang2, Hui Wei1
1J. R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, Kansas 66506, USA.
Nature Communications
|May 31, 2014
Summary
Optimizing laser waveform with multi-color fields significantly enhances high-order harmonic generation. This breakthrough promises brighter, more efficient tabletop X-ray light sources and attosecond pulses.
Area of Science:
- Physics
- Quantum Optics
- Laser Science
Background:
- Intense lasers generating high-order harmonics (HHGs) can create tabletop broadband X-ray light sources.
- Current HHG methods suffer from low conversion efficiency, limiting their practical application.
Purpose of the Study:
- To investigate methods for enhancing high-order harmonic generation efficiency.
- To explore the potential of waveform optimization for improving X-ray light source brightness and usability.
Main Methods:
- Synthesizing two- or three-color laser fields to optimize the laser waveform.
- Generating high-order harmonics in a gas medium using the optimized laser fields.
- Analyzing the phase-matching conditions and harmonic yields.
Main Results:
- Harmonic yields were enhanced by one to two orders of magnitude without increasing total laser power.
- Optimized multi-color fields led to favorable phase-matching, enabling efficient radiation buildup.
- The enhanced harmonics show potential for significantly increasing overall harmonic yields.
Conclusions:
- Waveform optimization using multi-color fields is a viable strategy to boost HHG efficiency.
- This advancement paves the way for practical, bright tabletop X-ray sources and attosecond pulse generation.
- Future integration with high-repetition-rate lasers could yield multi-order-of-magnitude increases in harmonic brightness.
