Heterogeneous integration of an on-chip Nd:YAG whispering gallery mode laser with a lithium-niobate-on-insulator platform.
Opt Lett
; 49(6): 1397-1400, 2024 Mar 15.
Article
en En
| MEDLINE
| ID: mdl-38489409
ABSTRACT
The integration of heterogeneous optical components onto an optical platform is crucial for the advancement of photonic chips. To achieve this, efficient coupling of optical signals between components and the platform is essential. Here, we have successfully integrated a NdYAG microdisk laser with a lithium-niobate-on-insulator (LNOI) photonic platform by modulating the propagation modes of LNOI. Ridge waveguides are fabricated on the LNOI by carefully adjusting the cross-sectional dimensions to enable the propagation of higher-order propagation modes. This ridge waveguide ensures that the effective refractive index of the higher-order mode closely matches that of the fundamental mode of the NdYAG microdisk, ensuring efficient waveguide-microdisk coupling. This on-chip laser, consisting of an NdYAG microdisk and LNOI integration, achieves a maximum output power of 23â
µW, and a mode suppression ratio of 53.6â
dB. This research presents an efficient approach for constructing highly functional heterogeneous integrated optical chips.
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Opt Lett
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2024
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Article