Numerical Study of Conversion Efficiency of Laser-Produced Plasma Light Source via Pump Laser
Chun-Tse Wu1*, Yao-Li Liu2, Po-Yen Lai1, Shih-Hung Chen1
1Physics, National Central University, Taoyuan, Taiwan
2Institute of Space and Plasma Sciences, National Cheng Kung University, Tainan, Taiwan
* Presenter:Chun-Tse Wu, email:112282002@cc.ncu.edu.tw
Light emission at specific wavelengths is important for many applications. Due to the ionization potential of electrons, the wavelength limit of solid or gas lasers is around 100 nm. For shorter wavelengths of light, other technologies are required, such as high harmonic generation and laser-produced plasma (LPP) light sources. Among them, LPP light source has higher conversion efficiency (CE) [1]. Therefore, LPP light sources are used in many important applications, such as nanolithography and ignition of fusion reactors.
We developed a one-dimensional simulation framework to study LPP light sources that adopts a quasi-steady state assumption [2]. This simulation framework has been benchmarked against the experiment [3] and shows good agreement. We found that the afterglow effect after pump laser injection plays an important role in LPP light sources. In this research, we study the effect of pump laser on CE of the light emission with a central wavelength of 13.5 nm and 2% bandwidth.

[1] Popmintchev, D., Hernández-García, C., Dollar, F., Mancuso, C., Pérez-Hernández, J. A., Chen, M. C., ... & Popmintchev, T. (2015). Ultraviolet surprise: Efficient soft x-ray high-harmonic generation in multiply ionized plasmas. Science, 350(6265), 1225-1231.
[2] Po-Yen Lai. "Numerical study of laser-driven plasma spectroscopy and kinetic behavior of a collisional plasma: For application of a laser-produced Sn plasma extreme ultraviolet light source." PhD Thesis. National Central University, 2016.
[3] Behnke, L., Schupp, R., Bouza, Z., Bayraktar, M., Mazzotta, Z., Meijer, R., Sheil, J., Witte, S., Ubachs, W., Hoekstra, R., & Versolato, O. O. (2021). Extreme ultraviolet light from a tin plasma driven by a 2-µm-wavelength laser. Optics Express, 29(3), 4475-4487.


Keywords: Laser-produced plasma, Afterglow, One-dimensional simulation