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首页> 外文期刊>Optics Letters >Femtosecond laser inscription of depressed cladding single-mode mid-infrared waveguides in sapphire
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Femtosecond laser inscription of depressed cladding single-mode mid-infrared waveguides in sapphire

机译：蓝宝石中凹陷覆盖单模中红外波导的飞秒激光题字

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摘要

Mid-infrared optical waveguides were inscribed in sapphire with femtosecond pulses at 515 nm. We show that such pulses induce a smooth negative refractive index change allowing for the inscription of a depressed cladding waveguide by closely overlapping the corresponding type I modification traces. The resulting structure consists of a highly symmetrical, uniform, and homogeneous waveguide. The size and numerical aperture of the waveguides were tailored to achieve efficient transmission in the mid-infrared. Single mode operation at a wavelength of 2850 nm and propagation loss of 0.37 dB/cm are reported for a 33 mm long depressed cladding waveguide. Thermal annealing was performed, and the refractive index contrast was still preserved to 50% (i.e., Delta n = similar to 2.5 x 10(-3)) up to 1400 degrees C. (C) 2018 Optical Society of America
机译：中红外光波导在蓝宝石中铭刻在515nm处的飞秒脉冲中。 我们表明这种脉冲诱导光滑的负折射率，允许通过紧密地重叠相应的I型修改迹线来铭文来归档凹陷的包层波导。 所得结构包括高度对称，均匀和均匀的波导。 吸引波导的尺寸和数值孔径定制以在中红外线中实现有效的传输。 波长为2850nm的单模操作和延伸的传播损耗。对于33mm长的凹陷包层波导报告了33mm的0.37dB / cm。 进行热退火，折射率对比度仍然保持在50％（即，ΔN=类似于2.5×10（-3）），高达1400℃（c）2018年光学学会

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