Optical replication of relief-phase gratings in volume medium

摘要

This presentation is devoted to methods of multiplex volume Bragg diffraction gratings production. One of last developed and most promising volume photosensitive material of a such gratings is a photo-thermo-refractive glass. Low photosensitivity and high cost of suitable lasers for this material is a huge disadvantage. This makes traditional interference method of Brag gratins production difficult to implement. Thus a new method or a new vision of previous methods of a Bragg grating production required. A scheme of optical replication of easy-to-earn relief-phase grating into volume medium is considered. A mathematical modelling of interference field forming in volume medium during this process and attained diffraction efficiency of Bragg grating is performed. Experimental research at pulsed and CW lasers setups were carried out and achieved samples of multiplex Bragg grating described. A method of vibration-independent and low-sensitivity-material-suitable optical replication for production of multiplex volume Bragg gratings is described.