How does laser pulse chirp affect electron emission in microplasmas? This study investigates the influence of chirp—a change in frequency over time—in laser pulses on electron emission from microdroplets. The research examines electron emission from microdroplets subjected to distortion via a pre-pulse, analyzing the role of chirp sign and pulse width. Results indicate minor differences in spectral shape with varying chirp signs, but a small change in average electron energy. Increased pulse width diminishes both electron emission and average electron energy. Analytical formalism, identifying two-plasmon decay instability as a key mechanism, provides insights into these measurements. 2D particle-in-cell simulations show strong agreement with experimental measurements, validating the findings. This study enhances understanding of laser-plasma interactions and electron emission dynamics, with implications for laser-based technologies and plasma physics research.
Published in Physics of Plasmas, this article fits perfectly within the journal’s scope of covering fundamental and applied research in plasma physics. The investigation of electron emission from microplasmas, particularly focusing on the role of chirp, aligns with the journal's emphasis on advancing knowledge in plasma behavior and laser-plasma interactions.