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Second‐Harmonic Generation with a 440 000% W−1 Conversion Efficiency in a Lithium Niobate Microcavity without Periodic Poling.
- Source :
-
Laser & Photonics Reviews . Jul2024, Vol. 18 Issue 7, p1-6. 6p. - Publication Year :
- 2024
-
Abstract
- Thin‐film lithium niobate (TFLN) enables extremely high‐efficiency second‐order nonlinear optical effects due to large nonlinear coefficient d33 and strong optical field confinement. Here, a pulley‐waveguide‐coupled microring resonator with an intrinsic quality factor above 9.4 × 105 on the reverse‐polarized double‐layer X‐cut TFLN is designed and fabricated. In such a TFLN resonator without fine domain structures, second harmonic generation with a normalized conversion efficiency of 440,000% W−1 with weak pump power, approaching that in periodically poled lithium niobate (PPLN) microring resonators, and an absolute conversion efficiency of 30% is realized with a sub‐milliwatt continuous pump. This work reduces the dependence of high‐efficiency nonlinear frequency conversion on PPLN microcavities that are difficult to prepare. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SECOND harmonic generation
*FREQUENCY changers
*QUALITY factor
*RESONATORS
Subjects
Details
- Language :
- English
- ISSN :
- 18638880
- Volume :
- 18
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Laser & Photonics Reviews
- Publication Type :
- Academic Journal
- Accession number :
- 179140777
- Full Text :
- https://doi.org/10.1002/lpor.202300951