TY - JOUR
T1 - Mid-infrared supercontinuum and frequency comb generations by different optical modes in a multimode chalcogenide strip waveguide
AU - Cheng, Yujun
AU - Yuan, Jinhui
AU - Mei, Chao
AU - Li, Feng
AU - Zhou, Xian
AU - Wu, Qiang
AU - Yan, Binbin
AU - Wang, Kuiru
AU - Yu, Chongxiu
AU - Long, Keping
AU - Wai, P. K. A.
PY - 2020/11/18
Y1 - 2020/11/18
N2 - Supercontinuum (SC) with broad bandwidth and high coherence is crucial in the SC-based frequency comb source generation. In this paper, we numerically investigate the mid-infrared (MIR) SC generations with the three optical modes (TE00, TE10, and TE20) in a multimode chalcogenide (As2Se3) strip waveguide. The waveguide structure is carefully engineered to ensure that the pump pulses are propagated in the normal dispersion regions of the considered three optical modes. Highly coherent and octave-spanning MIR SCs are generated when the optimized pump pulse with 80-fs pulse duration, 3-kW peak power, and 3-μm center wavelength is used. Moreover, the nonlinear dynamics of the SC generation are numerically analyzed. Finally, the SC-based frequency combs are numerically demonstrated when a pulse train with a repetition rate of 50 MHz is used as the pump source and launched into the multimode As2Se3-based strip waveguide. It is believed that the generated MIR SC and SC-based frequency comb sources have important applications in biophotonics, metrology, and sensing.
AB - Supercontinuum (SC) with broad bandwidth and high coherence is crucial in the SC-based frequency comb source generation. In this paper, we numerically investigate the mid-infrared (MIR) SC generations with the three optical modes (TE00, TE10, and TE20) in a multimode chalcogenide (As2Se3) strip waveguide. The waveguide structure is carefully engineered to ensure that the pump pulses are propagated in the normal dispersion regions of the considered three optical modes. Highly coherent and octave-spanning MIR SCs are generated when the optimized pump pulse with 80-fs pulse duration, 3-kW peak power, and 3-μm center wavelength is used. Moreover, the nonlinear dynamics of the SC generation are numerically analyzed. Finally, the SC-based frequency combs are numerically demonstrated when a pulse train with a repetition rate of 50 MHz is used as the pump source and launched into the multimode As2Se3-based strip waveguide. It is believed that the generated MIR SC and SC-based frequency comb sources have important applications in biophotonics, metrology, and sensing.
KW - Chalcogenide strip waveguide
KW - different optical modes
KW - frequency comb
KW - supercontinuum
UR - http://www.scopus.com/inward/record.url?scp=85096321148&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2020.3036282
DO - 10.1109/ACCESS.2020.3036282
M3 - Article
SN - 2169-3536
VL - 8
SP - 202022
EP - 202031
JO - IEEE Access
JF - IEEE Access
M1 - 9248995
ER -