The Research Of Photothermo Refractive Glass

Photo-active glass-ceramic have been extensively studied in recent years for it is an attractive high diffraction efficiency grating materials. The composition, photosensitivity crystallization theory and performance of photo-active glass-ceramic are studied in this paper for the development of modern optical technology to the needs of high diffraction efficiency grating. The photo-active glass-ceramic is prepared by using photosensitizer nucleation agent NaF KBr SnO₂ and Sb₂O₃ doped the glass system of Na-Zn-Al-Si. Spectroscopic transmittance, laser-induced damage of photo-active glass-ceramic have been measured after ultraviolet irradiation and thermal treatment. Precipitation of microcrystalline glass samples for the NaF have been produced successfully and we have found appropriate ultraviolet irradiation and thermal treatment in the experiment.The glass which is produced in the experiment have high anti-laser damage thresholdand its thermal stability more than 400°C as a new kind of volume holographicphotosensitive materials. Volume grating diffraction efficiency depend on the refractiveindex difference values An which is between the crystallization region after ultraviolet irradiation and thermal treatment and non-irradiated region and transmittance between visible and infrared region. Due to variations of refractive index difference values which is caused by glass crystallization of exposed part. The refractive index difference valuesâ–³n is up to 10^-4 order of magnitude and transmittance between infrared region and visible region is up to more than 90%.