Small-angle beam deviation with high resolution using gratings

Canhui Wang; Xuechang Ren; Xiangsu Zhang; Shou Liu; Guohua Liu

doi:10.1117/12.820543

19 May 2009 Small-angle beam deviation with high resolution using gratings

Canhui Wang, Xuechang Ren, Xiangsu Zhang, Shou Liu, Guohua Liu

Proceedings Volume 7358, Holography: Advances and Modern Trends; 73580M (2009) https://doi.org/10.1117/12.820543
Event: SPIE Optics + Optoelectronics, 2009, Prague, Czech Republic

Abstract

Small-angle beam deviation has many applications and is conventionally performed by wedge prisms. The usual method suffers from a disadvantage that the manufacturing tolerances limit the resolution to about an arc second. The paper presents a new technique of using low frequency gratings to realize small-angle beam deviation with higher resolution. By rotating a grating placed in the laser beam path, the deviation of the diffracted light beams can be controlled. Using the proposed method, very small beam deviation angle can be achieved under large grating rotation angle, resulting in high reduction ratio. Theoretical analysis shows that as long as the grating period is large enough, the reduction ratio can be much higher than that given by a wedge prism. The theoretical result has been verified experimentally using a holographic grating with 7.25 μm period placed in a Mach-Zehnder interferometer.

Citation Download Citation

Canhui Wang, Xuechang Ren, Xiangsu Zhang, Shou Liu, and Guohua Liu "Small-angle beam deviation with high resolution using gratings", Proc. SPIE 7358, Holography: Advances and Modern Trends, 73580M (19 May 2009); https://doi.org/10.1117/12.820543

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