This session explores nonlinear optical phenomena, ultrafast laser pulses, and nonlinear optical materials for generating and manipulating light. Discussions will cover nonlinear spectroscopy techniques, frequency conversion processes, and applications in quantum electronics and precision metrology. Nonlinear optics enables the development of ultrafast lasers and nonlinear imaging techniques, essential for studying dynamic processes in materials and biological systems. By sharing research on nonlinear optical materials and ultrafast laser technologies, this session aims to advance fundamental understanding of light-matter interactions, facilitate technology development in optical communications and sensing, and inspire innovative applications in quantum information science.