Two dimension zero position grating and its application in nano metrology;

Incremental optical electric axial angle encoder usually adopts zero position grating providing absolute zero position in order to prevent from data fault during electricity failure suddenly.

In this article,a planar positioning sensor based on speeially coded two-dimensional zero-reference grating is proposed,the zero reference signals are obtained from the non- periodic cede in both x and y direction.

20030358020), we studied a kind of specially coded two-dimensional zero-reference grating systematically.

A two-dimensional zero reference grating by transmission-reflection based on the theory of two-dimensional zero reference grating was proposed.

The method uses the Moiré interferometric device to measure the fracture toughness and employs electrochemical process to etch cross zero- thickness grating directly on the surface of specimen.

Generation of an adjustable double-well optical trap by shift phase gratings;

Methyl violet dyes doped polyvinyl membrane build phase grating under two branchs of coherent beams irradiation.

The Fresnel diffraction of a 0-π phase grating under chirped femtosecond laser pulse illumination is analyzed.

Study on the laser diffraction and interference field of a phase grating;

The vector diffraction theory analysis of chromatic dispersion characteristics of phase grating;