Light generation and manipulation

Light generation and manipulation is important for communication, signal processing and many others applications. In addition to the nonlinear techniques, which is are very powerful ways to convert light from one frequency band to another or to generate frequency combs, we also work with lasing systems and other ways to control and shape light, such as through the Talbot effect. Our work on lasers is based on doped optical fibers, such as with erbium or thulium. We are mostly interested in the design of simple but all-fibers robust cavities. For example we have investigated how to eliminate isolators, which are expensive and have a limited operational bandwidth, by engineering the shape of the optical cavity, or how to design simple modelocked cavities which are wavelength stabilized by fiber Braggs.  In addition to studying and leveraging intra-cavity dynamics, we also investigate out of cavity manipulations, such as by using the Talbot effect, shaping with electro optic modulators, spatial light modulators and more.

Selected Publications:

1. M. Bartnick, G. Bharathan, T.A. Goebel, R.G. Krämer, S. Nolte, C.-S. Brès, ‘Wavelength-stabilized figure-of-9 thulium-doped all-fiber laser emitting 560 fs pulses,’ Laser Physics 34 (2), 025101 (2023)

2. J. Wu, M. Clementi, E. Nitiss, J. Hu, C. Lafforgue, C.-S. Brès, ‘Bright and dark Talbot pulse trains on a chip,’ Communications Physics 6 (1), 249 (2023)

3. I. Cardea, D Grassani, SJ Fabbri, J Upham, RW Boyd, H Altug, SA Schulz, C.-S.Brès, ‘Arbitrarily high time bandwidth performance in a nonreciprocal optical resonator with broken time invariance.’ Scientific reports 10 (1), 15752 (2020)

4. J. Hu, C.-S.Brès, C.-B. Huang, ‘Talbot effect on orbital angular momentum beams: azimuthal intensity repetition-rate multiplication,’ Optics Letters 43 (16), 4033-4036 (2018)

5. S. Kharitonov, C.-S. Brès, ‘All-fiber dissipative soliton resonance mode-locked figure-9 thulium-doped fiber laser,’ The European Conference on Lasers and Electro-Optics, CJ_13_4 (2017)

6. S. Kharitonov, C.-S. Brès, ‘Isolator-free unidirectional thulium-doped fiber laser,’ Light: Science & Applications 4 (10), e340-e340 (2015)

7. M.A. Soto, M. Alem, M. Amin Shoaie, A. Vedadi, C.-S. Brès, L. Thévenaz, T. Schneider, ‘Optical sinc-shaped Nyquist pulses of exceptional quality’, Nature communications 4 (1), 2898 (2013)