Cascaded Raman lasing in a lithium tetraborate whispering gallery mode resonator
Lithium tetraborate (LB4) is a lithium borate compound known for its exceptional linear and nonlinear optical properties, including a wide transparency range (0.16–3.5 μm) and high Raman gain. Here, a millimeter-sized LB4 whispering gallery mode (WGM) resonator with a record quality factor of 2.0×10 9 at 517 nm was fabricated using single-point diamond cutting. Pumped with about 10 mW at 517 nm, it demonstrated four cascaded stimulated Raman scattering (SRS) peaks (537–608 nm), with the first-order SRS achieving a threshold of 0.71 mW and 7.2% slope efficiency. To our knowledge, this marks the first LB4 WGM resonator Raman laser.
Authors
- Chengcai Tian (ORCID: https://orcid.org/0009-0003-7007-3651)
- L. Bohatý (ORCID: https://orcid.org/0000-0002-9565-8950)
- P. Becker (ORCID: https://orcid.org/0000-0003-4784-3729)
- Harald G. L. Schwefel (ORCID: https://orcid.org/0000-0002-4304-6469)
- Richard J. Blaikie (ORCID: https://orcid.org/0000-0002-6991-835X)
- Keith C. Gordon (ORCID: https://orcid.org/0000-0003-2833-6166)
- Florian Sedlmeir (ORCID: https://orcid.org/0009-0004-9091-8460)
- Jervee Punzalan (ORCID: https://orcid.org/0009-0001-2916-6229)
Institutions
- The Dodd-Walls Centre for Photonic and Quantum Technologies (NZ)
- Institute of Mineralogy (RU)
- University of Otago (NZ)
- MacDiarmid Institute for Advanced Materials and Nanotechnology (NZ)
Publication Details
- Journal
- Photonics Research
- Published
- 2025-05-27
- DOI
- https://doi.org/10.1364/prj.560671
- Citations
- 1
- Primary Topic
- Photonic and Optical Devices
- Type
- article
- Field-Weighted Citation Impact
- 0.73