Changzheng Sun, Yanzhen Zheng, Bing Xiong, Lai Wang, Zhibiao Hao, Jian Wang, Yanjun Han, Hongtao Li, Yi Luo. Advances in III-nitride-based microresonator optical frequency combs (Invited)[J]. Infrared and Laser Engineering, 2022, 51(5): 20220270
- Infrared and Laser Engineering
- Vol. 51, Issue 5, 20220270 (2022)
Fig. 1. GaNOI nonlinear photonics platform
![(a) NIR optical frequency comb generation in sputtered AlN microring resonators[18]; (b) Near visible and green frequency comb generation via SHG, SFG and THG[19]](/richHtml/irla/2022/51/5/20220270/img_2.jpg)
Fig. 2. (a) NIR optical frequency comb generation in sputtered AlN microring resonators[18]; (b) Near visible and green frequency comb generation via SHG, SFG and THG[19]
![(a) Device schematic, (b) dispersion profile, and SEM images of (c) microring waveguide and (d) bus waveguide facet of a crystalline AlN microring resonator[14] ; (e),(f) Broadband NIR and near visible band optical frequency comb generation[21]](/Images/icon/loading.gif){kind=icon}
Fig. 3. (a) Device schematic, (b) dispersion profile, and SEM images of (c) microring waveguide and (d) bus waveguide facet of a crystalline AlN microring resonator[14] ; (e),(f) Broadband NIR and near visible band optical frequency comb generation[21]
Fig. 4. (a) Schematic of Pockels soliton microcomb generation via OPO; (b)-(c) Comb initiation and expansion, and (d) the experimental setup[28]
Fig. 5. (a) FWM spectrum from a 3-mm-long GaN waveguide with 250 mW pump power; (b) FWM conversion efficiency vs. pump power[31]
Fig. 6. (a)-(d) Fabrication procedures of GaN microring resonators; (e)-(f) SEM images of the ring waveguide and the bus waveguide in a GaN microring resonator[17]
Fig. 7. (a) Chaotic frequency comb under TM00 pump; (b) Soliton microcomb under TM00 pump; (c) Raman assisted chaotic Kerr comb with TE00 pump[17]
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Table 1. Properties of microcomb material platforms at telecom wavelengths
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