Capillary Discharge Soft X-Ray Laser Technologies
Summary
Capillary discharge soft X-ray lasers exploit rapid electrical breakdown within narrow, gas-filled tubes to produce high-temperature, high-density plasmas that amplify radiation at wavelengths typically around 46.9 nm. A low-energy pre-ionisation pulse establishes a weakly ionised channel, followed by a high-current main discharge that pinches the plasma via its self-magnetic field (the Z-pinch effect). Under optimised conditions of gas pressure, capillary geometry and current waveform, Ne-like ions form a population inversion and generate intense, coherent soft X-ray pulses by stimulated emission. The compactness and relative simplicity of these devices have made them attractive for applications ranging from nanoscale imaging and biological tomography to extreme ultraviolet lithography. Recent advances have focused on reducing driver voltages, improving repetition rates, refining beam quality and integrating multi-pass resonators to boost output energy and stability. Ongoing efforts aim to translate laboratory prototypes into reliable, table-top sources for widespread scientific and industrial use.
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Capillary Discharge Soft X-Ray Laser Technologies publication trend
The graph below shows the total number of articles in capillary discharge soft x-ray laser technologies across all publications each year (not limited to Nature Index journals).
Technical terms
Capillary discharge: Rapid electrical breakdown of gas within a narrow tube that generates a dense plasma column for soft X-ray lasing.
Z-pinch: Magnetic compression of plasma produced by an axial current, raising temperature and density to enable population inversion.
Ne-like argon: Argon ions stripped to a configuration resembling neutral neon, whose electronic transitions near 46.9 nm provide the laser gain.
Gain saturation: Condition where stimulated emission depletes the excited-state population faster than it is replenished, limiting further amplification.
References
- Demonstration of multi-pass amplification of 46.9 nm laser pumped by capillary discharge. Matter and Radiation at Extremes (2023).
- Soft x-ray Ar + 8 laser excited by low-voltage capillary discharge.. Optics Express (2023).
- Short rise- and decay-time Z-pinch currents for soft x-ray laser excitation. AIP Advances (2024).
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