Laser formation of micro-optical elements based on glass-ceramics materials

摘要

Abstract: Some peculiarities of phase-structure transformations of glass-ceramics materials and ceramics are investigated under laser irradiation. The influence of a CO$-2$/-laser beam with a radiant flux density of about 10$+6$/ W/m$+2$/ at a surface of glass-ceramic plate leads to the change of a ratio between amorphous and crystalline phases in the microvolume of a substance. It permits us to control the optical properties of glass-ceramics and to receive an optical transparent channel in the surface layer of an optically opaque specimen. Spherical micro-lenses are formed by an optically opaque specimen. Spherical micro-lenses are formed by an amorphization through the whole of the substance melting and quickly cooling down. The optical image quality is assessed by modulation transfer function measurements for different parameters of micro-lenses. It is stated that the micro-lenses could be useful for optical signal processing of objects with spatial frequencies to 15 mm$+$MIN@1$/. It is possible to produce micro-optics arrays with different spatial periods, focal lengths, and sizes of each element. Prospects also are outlined for local modification of optical properties of some ceramics by a scanning device which is capable of forming the desired configuration of temperature field inside the specimen. !7