Abstract
Planar structure consisting of line array with embedded nanogratings, which can function as a polarization-dependent light attenuator, was fabricated inside fused silica using a tightly focused 1 kHz fs laser scanning. Microstructure in the laser-modified region was characterized with Raman spectroscopy and scanning electron microscopy. Wavelength response and thermal stability of the structure were studied. The polarization-dependent attenuation efficiency decreases with increasing wavelength. The structure can resist high temperature up to 900 °C, and proper heat treatment can improve its attenuation efficiency. The results provide some new insights into the characteristics of fs laser-induced self-organized nanogratings and an alternative way to produce a polarization-dependent light attenuator that can be used in harsh environment.
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Acknowledgments
This work is financially supported by the National Natural Science Foundation of China (Grants No. 51072054, 51072060, 51132004), Guangdong Natural Science Foundation (Grant No. S2011030001349), and National Basic Research Program of China (2011CB808100).
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Zhang, F., Yu, Y., Cheng, C. et al. Wavelength response and thermal stability of embedded nanograting structure light attenuator fabricated by direct femtosecond laser writing. Appl. Phys. B 117, 53–58 (2014). https://doi.org/10.1007/s00340-014-5797-y
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DOI: https://doi.org/10.1007/s00340-014-5797-y