PhD: All-fiber Mamyshev oscillator in transient regime (M/F)
New
- FTC PhD student / Offer for thesis
- 36 mounth
- BAC+5
This offer is available in English version
This offer is open to people with a document recognizing their status as a disabled worker.
Offer at a glance
The Unit
Physique des lasers, atomes et molécules
Contract Type
FTC PhD student / Offer for thesis
Working hHours
Full Time
Workplace
59658 VILLENEUVE D ASCQ
Contract Duration
36 mounth
Date of Hire
01/10/2026
Remuneration
2300 € gross monthly
Apply Application Deadline : 19 May 2026 23:59
Job Description
Thesis Subject
Mamyshev oscillators are a type of pulsed laser whose cavity consists of a pair of wavelength-shifted filters separated by amplifying fibers. Mode locking is achieved because only high-peak-power pulses are sufficiently spectrally broadened by the Kerr effect to pass successively through both filters. The performance of these oscillators is attractive because they can generate femtosecond pulses with peak powers of several MW, making them good candidates for biomedical nonlinear imaging or materials processing. However, even though this architecture may seem simple, undesirable modes such as bound states or chaotic regimes can be observed. Furthermore, it may be necessary to inject a pulse from another laser or generated by a side arm to start the oscillator, which increases its complexity. To find solutions to these two issues and also to identify the main sources of noise, we propose to numerically study the oscillator in the transient regime by coupling the nonlinear Schrödinger equation with the population inversion rate equations and taking into account amplified spontaneous emission. This study will provide avenues for further research (fiber and filter characteristics, addition of components, etc.) that will be tested experimentally.
Your Work Environment
The PHLAM laboratory is a physics research unit based in Lille. Its activities cover optics, photonics, lasers, and atomic and molecular physics. The laboratory conducts both fundamental research and applied work (telecommunications, healthcare, sensors). It is equipped with advanced experimental platforms and collaborates with international academic and industrial partners.
The doctoral student will be supervised by Olivier Vanvincq and Simon Boivinet, with weekly meetings dedicated to monitoring scientific progress and defining short-term objectives. More informal discussions will also take place as needed, particularly during intensive phases of numerical development or data analysis. The doctoral student will be fully integrated into the team, participating in group meetings and laboratory seminars
Compensation and benefits
Compensation
2300 € gross monthly
Annual leave and RTT
44 jours
Remote Working practice and compensation
Pratique et indemnisation du TT
Transport
Prise en charge à 75% du coût et forfait mobilité durable jusqu’à 300€
About the offer
| Offer reference | UMR8523-OLIVAN-002 |
|---|---|
| CN Section(s) / Research Area | Atoms and molecules, optics and lasers, hot plasmas |
About the CNRS
The CNRS is a major player in fundamental research on a global scale. The CNRS is the only French organization active in all scientific fields. Its unique position as a multi-specialist allows it to bring together different disciplines to address the most important challenges of the contemporary world, in connection with the actors of change.
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