Latest Bayfol HX® developments: ultrahigh index modulation and NIR recordable holographic films

Cyclic allylic sulfide based photopolymer for holographic recording showing high refractive index modulation

“…The effect of the thermal treatment becomes more relevant at higher monomer concentration and a remarkably high refractive index modulation of 0.0346 is achieved at 19.5 wt% (sample 8). Such value is among the largest reported in the literature for photopolymeric systems 24,25,31,63 . Increasing even more the concentration up to 23.6 wt% (sample 9) does not induce a ∆n increase as high as expected.…”

High-Performance Holographic Photopolymers Based on Low Refractive Index Host Matrices Containing Fluoroelastomers

“…In addition, the highest one comes from the sample containing 16 wt % HT-F197, and it is also 0.054. To the best of our knowledge, it is currently the highest value reported in the literature for a solvent-free photopolymer except for BayerHX. , …”

“…Holographic optical elements (HOEs) have been widely used in near-eye display systems such as virtual reality, augmented reality (AR), mixed reality, and head-up display fields due to their advantages of lightweight, small size, convenient production, easy miniaturization, and functional integration. , Photopolymers possess great application potential in fabricating transparent HOEs, so they have gained widespread attention in recent years. − The refractive index modulation (Δ n ) of photopolymers is a key indicator to determine their holographic performance. ,− Though there are a few photopolymers with Δ n above 0.05, their preparation processes require the use of volatile solvents, which is not favorable for large-scale applications. , So far, with the exception of BayerHX, almost no solvent-free photopolymers with Δ n above 0.05 have been reported . Therefore, the development of solvent-free photopolymers capable of Δ n as high as possible is becoming a hot research topic in this field. ,,, …”

“…12,13 So far, with the exception of BayerHX, almost no solvent-free photopolymers with Δn above 0.05 have been reported. 14 Therefore, the development of solvent-free photopolymers capable of Δn as high as possible is becoming a hot research topic in this field. 5,7,15,16 Photopolymers for holographic recording consist of three main components: photoinitiating system, host matrix, and writing monomer.…”

High-performance photopolymers for recording transmission/reflection holographic gratings

“…In addition, reflection VHGs are required to meet the application requirements in the AR field 3 . However, except for Bayfol ® HX, few non-volatile holographic photopolymers can fabricate high-performance reflection VHGs 5,13,14 . It has become the biggest technical bottleneck restricting the development of this field 15 .…”