Laser-plasma instability (LPI) is one of the key issues in the ignition process of inertial confinement fusion (ICF), and extensive theoretical, simulation, and experimental research has been conducted over the years. Broadband laser, due to its low temporal coherence, can reduce the effective electric field strength when interacting with plasma and disrupt the phase-matching conditions of LPI, thus considered an effective approach to solving LPI issues. Current extensive simulation studies indicate that broadband laser can suppress the generation of phenomena such as Stimulated Brillouin Scattering (SBS), Stimulated Raman Scattering (SRS), and Two-Plasmon Decay (TPD) to some extent. There are also a few backward scattering experimental studies, but more experimental research such as side-scattering is still needed. Therefore, based on the broadband second harmonic laser facility “Kunwu”, this paper designs experiments for the lateral scattering of critical density plasma driven by broadband and traditional narrowband lasers, as well as the production of hot electrons. The experimental results show that the side SBS and side SRS spectra and shares at different angles excited by broadband lasers with a power density of 1×10 ¹⁵W·cm ^-2have significant differences from those of narrowband lasers. Further analysis reveals that the overall share of hot electrons in the lateral direction is higher for broadband lasers compared to narrowband lasers. However, under broadband conditions, the share of SRS at small forward and backward angles is significantly lower than that of narrowband lasers. Preliminary qualitative analysis suggests that SRS may not be the primary mechanism for hot electron generation in this case, and that PDI might play a dominant role in the generation of hot electrons.