BGPP continues to be a popular meeting for covering the state-of-the-art advances in fiber and waveguide gratings in a relaxed and nonpressured atmosphere. The program is tailored for informal exchanges, forming new partnerships, and reconnecting with colleagues. Attendees come from around the world to participate in this exchange of knowledge. The meeting topics are divided into three main themes: fundamentals of photosensitivity, glass relaxation and poling, properties of grating structures and techniques used in their fabrication, and applications of gratings, glass relaxation and poled glass.