18 February 2009 Diffraction gratings ablated on lithium niobate single crystal by femtosecond pulses
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Abstract
The surface diffraction gratings on lithium niobate single crystal ablated by a femtosecond laser pulse at a wavelength of 800 nm have been investigated. The diffraction efficiencies of the gratings ablated with various parameters were measured by He-Ne laser at a wavelength of 632.8 nm. The 1-order diffraction efficiencies of the gratings improve from 1.7% to 2.3% with the increase of ablation speed from 20μm/s to 200μm/s, and decrease from 1.9% to 1.3% with the increase of pulse energy from 70nJ to 110nJ, respectively. The experimental and theoretical results show that the diffraction efficiencies of gratings can be improved by increase of ablation speed and grating constant or decrease of pulse energy.
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Benhai Yu, Benhai Yu, Qingbin Tang, Qingbin Tang, } "Diffraction gratings ablated on lithium niobate single crystal by femtosecond pulses", Proc. SPIE 7276, Photonics and Optoelectronics Meetings (POEM) 2008: Laser Technology and Applications, 727613 (18 February 2009); doi: 10.1117/12.821452; https://doi.org/10.1117/12.821452
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