期刊
OPTICS AND LASER TECHNOLOGY
卷 138, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2020.106846
关键词
Ultra-low expansion glass-ceramics; Femtosecond laser direct writing; Laser-induced vitrification; Lithium aluminosilicate glass; Depressed-cladding waveguide
资金
- Russian Science Foundation [19-19-00613]
- Russian Science Foundation [19-19-00613] Funding Source: Russian Science Foundation
This study demonstrates the direct femtosecond laser writing of depressed-cladding optical waveguides in extremely low expansion lithium aluminosilicate glass-ceramics, showing the possibility of single-mode waveguiding with outstanding thermal stability.
We report on direct femtosecond laser writing of depressed-cladding optical waveguides in extremely low expansion lithium aluminosilicate glass-ceramics. The waveguide cladding was formed by space-selective vitrification of nanocrystals in laser-modified regions of glass-ceramics responsible for the negative refractive index change up to 0.005. The optical properties of the laser-written waveguides were evaluated in terms of near-field and far-field intensity distribution and propagation losses at the wavelength of 1064 nm. The possibility of single-mode waveguiding with the upper limit of propagation losses 2.4 or 2.7 dB/cm for vertically or horizontally polarized light, respectively, was demonstrated. The obtained results open up new frontiers in the laser-assisted fabrication of 3D optical waveguide circuits in the media with outstanding thermal stability.
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