Valley density profile for highly efficient x-ray lasers with good beam quality
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China.
Optics Letters
|March 30, 2007
Summary
Researchers achieved high-gain x-ray laser operation using a novel three-pulse laser sequence. This method efficiently generates a powerful x-ray laser beam with low energy requirements.
Area of Science:
- Plasma Physics
- Laser Science
- X-ray Lasers
Background:
- Achieving high-gain operation in x-ray lasers requires specific plasma conditions.
- Previous methods often demand significant energy input.
Purpose of the Study:
- To develop an efficient method for generating high-gain x-ray laser beams.
- To achieve saturation operation at 32.6 nm with reduced pump energy.
Main Methods:
- Utilizing a sequence of normally and grazing-incident laser pulses (300 ps) to create a plasma with a valley density profile.
- Employing a short, grazing-incident 300 fs laser pulse for rapid heating of the plasma valley.
- Characterizing the resulting x-ray laser beam's properties, including deflection and divergence angles.
Main Results:
- Successfully generated a plasma suitable for high-gain x-ray laser operation.
- Produced a highly efficient x-ray laser beam with a deflecting angle of 2 mrad and divergence of 4 mrad.
- Achieved saturation operation at 32.6 nm using less than 100 mJ of total pump energy.
Conclusions:
- The proposed three-pulse laser technique is effective for efficient x-ray laser generation.
- This method offers a low-energy pathway to achieving high-gain, saturated x-ray laser output.
