Saini Than Singh, Trung Hoa Nguyen Phuoc, Nagasaka Kenshiro, Luo Xing, Tuan Tong Hoang, Suzuki Takenobu, Ohishi Yasutake
Appl Opt. 2018 Mar 1;57(7):1689-1693. doi: 10.1364/AO.57.001689.
A rib waveguide structure in AsSe chalcogenide glass has been designed and numerically analyzed for on-chip coherent supercontinuum generation in the midinfrared region. The waveguide structure possesses an all-normal dispersion profile with dispersion value of -13.22 ps/nm·km at the pump wavelength. Coherent midinfrared supercontinuum spectrum spanning 1.2 to 7.2 μm has been obtained using a 2.5 mm long rib waveguide when pumped with 200 fs laser pulses of a peak power of 2.5 kW and a repetition rate of 1 kHz at 2.8 μm. Such highly nonlinear subwavelength size rib waveguide structures are highly applicable for the power efficient on-chip midinfrared coherent supercontinuum sources. Coherent midinfrared supercontinuum sources are very important in frequency metrology, nonlinear microscopy, nondestructive testing, molecular spectroscopy, and optical coherence tomography.
已设计并对砷硒硫系玻璃中的肋形波导结构进行了数值分析，用于在中红外区域实现片上相干超连续谱产生。该波导结构具有全正色散分布，在泵浦波长处的色散值为-13.22 ps/nm·km。当用峰值功率为2.5 kW、重复频率为1 kHz、波长为2.8 μm的200 fs激光脉冲泵浦时，使用2.5 mm长的肋形波导获得了覆盖1.2至7.2μm的相干中红外超连续谱。这种高度非线性的亚波长尺寸肋形波导结构非常适用于高效的片上中红外相干超连续谱源。相干中红外超连续谱源在频率计量、非线性显微镜、无损检测、分子光谱和光学相干断层扫描中非常重要。
