Doctoral contract on the study of ion-light interaction for an ultra-stable laser frequency stabilised on rare-earth ions (M/F)
New
- FTC PhD student / Offer for thesis
- 36 months
- Doctorate
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
Laboratoire Temps Espace
Contract Type
FTC PhD student / Offer for thesis
Working hHours
Full Time
Workplace
75014 PARIS 14
Contract Duration
36 months
Date of Hire
01/11/2026
Remuneration
2300 € gross monthly
Apply Application Deadline : 03 August 2026 23:59
Job Description
Thesis Subject
We propose to investigate ion-light interaction over tens to thousands of seconds, for an ultra-stable laser locked on solid-state frequency references at dilution temperatures. The goal is to reach maintain 1E-17 stability at long term for frequency metrology applications.
Your Work Environment
Frequency locking generally requires the use of a laser beam at the frequency close to the centre of each narrow spectral hole for measurement and retroaction. Even if the sub-Hz laser line is much narrower than the kHz spectral holes, off-resonant photons, present with decreasing probability at increasing detuning, can still pump ions in neighbouring frequencies away over time, broadening the spectral holes and reducing our capacity of frequency discrimination.
Since the inhomogeneous absorption profile is broad (~2 GHz for 0.1% doping concentration), a natural solution is to use the SHs for a limited duration and then shift to a new frequency tens of MHz away (this value being determined by the detection architecture) to lock again. However, due to the presence of the hyperfine structures, separated by tens to hundreds of MHz and mixed up in the inhomogeneous profile, features like 'side holes' (the same absence of population seen at a different frequency by addressing a different excited state) and 'anti holes' (over population in a different ground state) will distort the spectroscopic landscape, generally biasing the frequency discrimination. In addition, when the entire inhomogeneous absorption profile becomes 'used up', efficient spectral hole erasure will be necessary in order to refresh the spectroscopic landscape before imprinting new spectral holes for locking.
We propose to carry out the following investigations of ion-light interaction in order to extend the duration of effective frequency stabilizationWe propose to carry out the following investigations of ion-light interaction in order to extend the duration of effective frequency stabilization.
Constraints and risks
NA
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 | UMR8255-BESFAN-002 |
|---|---|
| CN Section(s) / Research Area | Mathematics and mathematical interactions |
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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