Multilayer composite coating on ultraviolet-melted quartz substrate, achieving a laser transmittance as high as 99.8%. Multi-lens group to achieve laser collimated output at the diffraction limit, increasing treatment depth by more than 2 times. Complex achromatic lens structure to achieve high consistency in directing various wavelengths Hard coating technology ensures a high surface quality of λ/20, enhancing the durability of the coatings under intense high-power lasers