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We investigate the hot electrons generated from two-plasmon decay (TPD)instability driven by laser pulses with intensity modulated by a frequency$\Delta \omega_m$. Our primary focus lies on scenarios where $\Delta \omega_m$is on the same order of the TPD growth rate $ \gamma_0$ ( $\Delta \omega_m \sim\gamma_0$), corresponding to moderate laser frequency bandwidths for TPDmitigation. With $\Delta \omega_m$ conveniently modeled by a basic two-colorscheme of the laser wave fields in fully-kinetic particle-in-cell simulations,we demonstrate that the energies of TPD modes and hot electrons exhibitintermittent evolution at the frequency $\Delta \omega_m$, particularly when$\Delta \omega_m \sim \gamma_0$. With the dynamic TPD behavior, the overallratio of hot electron energy to the incident laser energy, $f_{hot}$, changessignificantly with $\Delta \omega_m$. While $f_{hot}$ drops notably withincreasing $\Delta \omega_m$ at large $\Delta \omega_m$ limit as expected, itgoes anomalously beyond the hot electron energy ratio for a single-frequencyincident laser pulse with the same average intensity when $\Delta \omega_m$falls below a specific threshold frequency $\Delta \omega_c$. We find thisthreshold frequency primarily depends on $\gamma_0$ and the collisional dampingrate of plasma waves, with relatively lower sensitivity to the density scalelength. We develop a scaling model characterizing the relation of $\Delta\omega_c$ and laser plasma conditions, enabling the potential extention of ourfindings to more complex and realistic scenarios.

Anomalous hot electron generation from two-plasmon decay instability driven by broadband laser pulses with intensity modulations