Infrared and Laser Engineering, Volume. 51, Issue 5, 20220312(2022)
Integrated chalcogenide frequency combs (Invited)
Fig. 1. Chalcogenide microresonators-based optical frequency combs generation. Three types of optical frequency combs can be generated: Bright soliton microcomb; Dark pulse microcomb; Raman-Kerr comb
Fig. 2. Fabrication process of high-
Fig. 3. Bright soliton comb generation in a GeSbS microresonator[34]. (a) The calculated and measured resonator dispersion for TM00 mode with a radius of 100 μm, and the cross-section is 2.4 μm×0.8 μm (width × height), respectively; (b) Transmission spectrum of the resonance when a laser is swept with a higher pump power, the "soliton step" can be observed; (c) The measured optical spectra as the pump laser is red-detuned into the cavity resonance (top to bottom), the pump power is fixed at ~20 mW
Fig. 4. Dark-pulse comb generation in a GeSbS microresonator[34]. (a) The measured dispersion curve of the same GeSbS microresonator in TE00 mode. Dashed and solid lines show the simulated integrated dispersion of the TE00 mode and high-order mode. Blue circles represent the measured integrated dispersion of the TE00 mode; (b) Normalized comb power when the laser was scanned from the blue side to the red side with high power; (c) The measured output optical spectra of dark-pulse combs at different stages as indicated in (b), black line denotes the simulated spectrum in stage III, the pump power is fixed at ~25 mW
Fig. 5. Raman-Kerr comb generation in a GeSbS microresonator[37]. (a) Measured Raman spectrum of GeSbS film with a thickness of 0.8 μm; (b) Schematic of the degenerate FWM between the pump wave, the first and the second Stokes waves; (c) Calculated dispersion curve for TE00 mode of the microresonators, with different waveguide widths (1.7 and 2.4 μm); (d) Calculated phase mismatch of the degenerate FWM process for (c); (e) The measured Raman-Kerr comb when increasing the pump power to ~30 mW in the 2.4-μm microresonator
|
Get Citation
Copy Citation Text
Di Xia, Jiaxin Zhao, Jiayue Wu, Zifu Wang, Bin Zhang, Zhaohui Li. Integrated chalcogenide frequency combs (Invited)[J]. Infrared and Laser Engineering, 2022, 51(5): 20220312
Category: Special issue—Microcavity optical frequency comb technology
Received: May. 7, 2022
Accepted: --
Published Online: Jun. 14, 2022
The Author Email: