Supervisors: Prof. A. Mussot (CNRS-PhLAM)
Optical frequency combs are groundbreaking light sources that have significantly advanced precision measurement science bridges optics and electronics, with applications ranging from pollutant detection to autonomous car distance measurement and even exoplanet detection [1]. This PhD thesis focuses on developing multiple frequency comb generation from a CW laser to ensure high mutual coherence. Using electro-optic modulators, nonlinear broadening will be exploited within an all-fiber system tailored for ultra-fast nonlinear spectroscopy. The multi-core fiber design will maintain coherence. A proof of concept has been achieved [2]; the goal is now to harness fiber technology—particularly the evolution of linear and nonlinear parameters—to achieve sub-100 fs pulses and 10’s THz performance, meeting the demands of advanced spectroscopy.
[1] T. Fortier and E. Baumann, “20 years of developments in optical frequency comb technology and applications,” Commun. Phys. 2, 153 (2019).
[2] E.-L. Bancel et al., « All-fiber frequency agile triple-frequency comb light source », Nat. Com., vol. 14, no 1, p. 7953, déc. 2023, doi: 10.1038/s41467-023-43734-w.
Planned secondment(s):
- UNILIM: Dr. B. Wetzel M21-M28 (8 months duration) “Optimization of the generation of multiple frequency combs in multicore fibers in cavity or propagation by optimization algorithms based on artificial intelligence”
- DTU: Prof. D. Zibar M29-32 (4 months duration) “Study of noise properties of frequency combs”