Corona charging of photothermoplastic devices in optical switching applications

摘要: Writing and erasing a holographic image on PTD (photothermoplastic device) needs the adjustment of great number parameters. Only parameters concerning corona charging are discussed. In conditions described previously, diffraction efficiency holograms recorded reaches 20%. Such high value makes PTDS interesting for many applications. However, main interest in comes from possibility cycling, i.e. writing new holograms. optical switching telecommunication networks, cycles needed. With thermoplastics, such as SE 10, an abietic ester which gives efficiency, several hundred made. The studied. It is shown that it useful to choose good-quality needle (materials, radius curvature) because its degradation can be observed. This quality appears also, set-up when organic product layered counter plate, current abnormally high; three or four times higher resistive material metallic conductive plate than not. widely spread phenomenon Finally, acceptance potential varies with parameter sample nature, temperature layer thickness presented. Also, decrease surface time specific property each product.