Surface relief diffraction gratings written on β -BaB2O4 crystal by femtosecond pulses

Y. Li1, P. Lu1, N. Dai1, X. Wang1, Y. Wang1, B. Yu1, H. Long1
1Wuhan National Lab for Optoelectronics and School of Optoelectronics Science and Engineering, Huazhong University of Science and Technology, Wuhan, P.R. China

Tóm tắt

Surface relief diffraction gratings were written at the entrance surface of a β-BaB2O4 (BBO) crystal under irradiation with femtosecond laser pulses. Probe–beam diffraction and atomic force microscopy (AFM) were employed to characterize the diffraction properties and the microstructures of the gratings. The maximal first-order diffraction efficiency of these gratings is approximately 63%. The surface periodic structure of the material induces noncollinear propagation of the fundamental input beam in the crystal. Using this diffractive optical element, efficient generation of multiple second-harmonic beams was achieved.

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