Role of bandwidth in Two Plasmon decay instability

Laser plasma interaction is an all-encompassing source of high energy electrons, ions, and electromagnetic radiation ranging from THz to X-rays. Due to the small source size and high flux, the beam has potential applications in various contexts, from defence to medical physics and many other industries. To make the source viable for many applications, producing high energy electrons with high repetition rate lasers is essential. High repetition lasers have low energy, longer pulse width, and shorter bandwidth. Our recent studies have shown that structural modification of the target reduces two plasmon decay instability threshold and enhances electron acceleration to MeV energies even at an intensity of ~ 10¹⁶ W/cm². In this work, we present the role of bandwidth on the emission of electrons studied by manipulating the chirp of the laser pulse for its potential use with MHz lasers.