Nonlinear optics in a quasi-waveguide (multi-pass cell) (source: FS-PRI)
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Description
Optical multi-pass cells (MPCs) represent a new tool for nonlinear optics with quasi-waveguiding properties hybridizing free-space and guided-wave nonlinear optics [1,2]. By passing a nonlinear crystal placed inside an MPC multiple times while maintaining an optical mode, a nonlinear frequency conversion process can effectively be split into N slices. In-between adjacent slices, the laser pulse properties can be altered e.g. by suitable amplitude and phase properties of the MPC mirrors. This way, unprecedented control possibilities for nonlinear optical processes inside these cells emerge, opening up an excellent playground for many nonlinear optical processes such as harmonic frequency conversion, wave mixing or parametric amplification.
We utilize these principles to develop new ultrafast laser platforms utilizing nonlinear processes beyond simply self-phase modulation for spectral broadening, including methods for wavelength-tuning as well as processes such as harmonic generation and parametric frequency conversion.
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Selected Publications
Balla, P., Tünnermann, H., Salman, S.H. et al. Ultrafast serrodyne optical frequency translator. Nat. Photon. 17, 187–192 (2023). DOI: 10.1038/s41566-022-01121-9
Funding
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