Continuous-wave cascaded-harmonic generation and multi-photon Raman lasing in lithium niobate whispering-gallery resonators
Abstract
We report experimental demonstration of continuous-wave cascaded-harmonic generation and Raman lasing in a millimeter-scale lithium niobate whispering-gallery resonator pumped at a telecommunication-compatible infrared wavelength. Intensity enhancement through multiple recirculations in the whispering-gallery resonator and quasi phase-matching through a nonuniform crystal poling enable simultaneous cascaded-harmonic generation up to the fourth-harmonic accompanied by stimulated Raman, two-photon, three-photon, and four-photon Raman scattering corresponding the molecular vibrational wavenumbers 632 and 255 cm-1 in z-cut lithium niobate at pump power levels as low as 200 mW. We demonstrate simultaneous cascaded-harmonic generation and Raman lasing by observing the spectrum of the scattered light from the resonator and by capturing the image of the decoupled light from the resonator on a camera.
- Publication:
-
Applied Physics Letters
- Pub Date:
- November 2011
- DOI:
- 10.1063/1.3665947
- arXiv:
- arXiv:1110.4394
- Bibcode:
- 2011ApPhL..99v1111M
- Keywords:
-
- laser cavity resonators;
- light scattering;
- lithium compounds;
- optical harmonic generation;
- optical images;
- optical phase matching;
- optical pumping;
- Raman lasers;
- solid lasers;
- stimulated Raman scattering;
- two-photon processes;
- vibrational modes;
- whispering gallery modes;
- 42.65.Ky;
- 42.55.Rz;
- 42.60.By;
- 42.60.Da;
- 42.65.Dr;
- Frequency conversion;
- harmonic generation including higher-order harmonic generation;
- Doped-insulator lasers and other solid state lasers;
- Design of specific laser systems;
- Resonators cavities amplifiers arrays and rings;
- Stimulated Raman scattering;
- CARS;
- Physics - Optics
- E-Print:
- doi:10.1063/1.3665947