A broadband bandwidth is key factor for the performance of the laser-aperture (~300 mm) and high energy (-kJ) Nd:glass laser facility, such as avoiding damage to optical components, improving laser-beam uniformity, improving extracted efficiency from energy-storage of laser amplifer. A broadband laser is also helpful to the experiment in high energy density science (HEDS), such as improving absorption of laser by a target and obtaining a higher target compression, suppressing the production of hot electron ...