Supercontinuum Light Generation In Nanofiber Gas Cells

Universities and Institutes of France
October 31, 2022
Contact:N/A
Offerd Salary:Negotiation
Location:N/A
Working address:N/A
Contract Type:Temporary
Working Time:Full time
Working type:N/A
Job Ref.:N/A
  • Organisation/Company: FEMTO-ST institute, CNRS, University of Bourgogne France-Comté
  • Research Field: Physics › Optics
  • Researcher Profile: First Stage Researcher (R1)
  • Application Deadline: 31/10/2022 18:00 - Europe/Brussels
  • Location: France › Besancon
  • Type Of Contract: Temporary
  • Job Status: Full-time
  • Hours Per Week: 38
  • Offer Starting Date: 01/12/2022
  • Reference Number: PhD-FEMTO-012
  • The physics and applications of fiber-based supercontinuum (SC) broadband light sources have been a subject of much interest over the last decade, with a significant impact on both basic science and industry. New uses are constantly emerging due to their unique properties that combine high brightness, multi-octave bandwidth, fiber delivery, and single-mode output 1. The last few years have also seen significant research efforts focused on extending the wavelength coverage of SC sources towards the 2 to 20 µm molecular fingerprint mid-infrared (MIR) region and in the ultraviolet (UV) down to 100 nm, while also improving stability, noise and coherence properties.

    This thesis project is twofold. First, it aims to investigate, both numerically and experimentally, the physics of SC generation in novel photonic gas cells using the evanescent field of sub-wavelength silica fiber tapers, as an alternative method to gas-filled hollow-core fibers 2. We expect novel evanescently-induced nonlinear effects in nanophotonic gas cells with strong potential for SC applications in both the UV range and the mid-IR ranges.

    Another topic covered by this thesis will be to explore SC generation in all- normal dispersion (ANDi) fibers that provide ultra-flat, low-noise, and coherent SC spectra, from self-phase modulation (SPM) and optical wave breaking (OWB) 3,4. The latter effect (OWB) has not been fully investigated and exploited for SC generation. This thesis aims to investigate, both numerically and experimentally, the effect of OWB in ANDi fibers and to provide a unified analysis with the four-wave mixing (FWM) theory and phase- matching conditions, and the dispersive shock wave formation in the time domain. The experiment will be based on a full-time/frequency analysis of femtosecond pulses propagating in parabolic dispersion fibers, both of which are already available in the lab. Ultimately, the main objective will be to improve the bandwidth and noise properties of SC sources based on parabolic dispersion fibers.

    This thesis will be conducted in the optics department of the FEMTO-ST institute with several experimented researchers in a friendly and stress-free work environment and in collaboration with several photonics companies and foreign labs.

    1. T. Sylvestre, E. Genier, A. N. Ghosh et al., “Recent advances in supercontinuum generation in specialty optical fibers,” J. Opt. Soc. Am. B 38, 90-103 (2021).

    2. F. Belli, A. Abdolvand, W. Chang, J. C. Travers, and P. St. J. Russell, “Vacuum ultraviolet to infrared supercontinuum in hydrogen-filled photonic crystal fiber,” Optica 2, 292–300 (2015).

    3. E. Genier, S. Grelet, R. D. Engelsholm, P. Bowen, P. M. Moselund, O. Bang, J. M. Dudley, T. Sylvestre, "Ultra-flat, low-noise, and linearly polarized fiber supercontinuum source covering 670–1390 nm," Opt. Lett. 46, 1820 (2021).

    4. E. Genier, P. Bowen, T. Sylvestre, J. M. Dudley, P. Moselund, and O. Bang, “Amplitude noise and coherence degradation of femtosecond supercontinuum generation in all-normal-dispersion fibers,” J. Opt. Soc. Am. B 36, A161–A167 (2019).

    The applicants holding a Master or Engineer degrees in physics, electronics, optics, lasers and related area. The candidates will ideally have basic training and knowledge covering the fields of physics, nonlinear optics, fiber optics, laser physics, optoelectronics, signal processing, and spectroscopy. Prior hands-on experience in experimental fiber optics, pulsed lasers and/or optical instrumentation would be desirable. Strong numerical competences with Matlab are desired for numerical modeling and experimental interfacing. Open- minded, curious and interested in working with both computer scientists and physicists. Ability to take initiatives and work both in autonomy and in group. Good writing skills and English level are required from the applicants. A basic level of French would be ideal to ensure effective communication.

    Funding details / Financement : MESRI (Public Funding)

    Start : Early November 2022 (deadline 2023-01-01) – 3 years duration

    Application deadline: 2022-10-31

    Gross Salary : 1975 €/month (for 3 years)

    Doctoral School : ED SPIM (Ingénierie et Micro-Techniques)

    Thesis Supervisors / Contact

    Thibaut Sylvestre (CNRS Research Director, HDR)

    E-mail : thibaut.sylvestre@univ-fcomte.fr

    Tél : +33676353156

    Co-supervisors : Dr Jean-Charles Beugnot, Pr. G. Fanjoux and Pr. John Dudley

    Benefits

    Funding details / Financement : MESRI (Public Funding)

    Start : Early November 2022 (deadline 2023-01-01) – 3 years duration

    Application deadline: 2022-10-31

    Gross Salary : 2000 €/month (for 3 years)

    Doctoral School : ED SPIM (Ingénierie et Micro-Techniques)

    Eligibility criteria

    Applicants must hold a master or engineer degrees in physics, optics and related area.

    They are invited to submit their application to thibaut.sylvestre@univ- fcomte.fr

    Application must contain the following documents:

    - CV including grades, marks and lab internships

    - Cover letter

    - At least 1 reference letter

    Selection process

    Interview, Questions & Answers

    Web site for additional job details

    https: // www. abg.asso.fr/fr/candidatOffres/show/idoffre/107292

    Offer Requirements
  • REQUIRED EDUCATION LEVEL
  • Physics: Master Degree or equivalent

  • REQUIRED LANGUAGES
  • FRENCH: Basic

    Skills/Qualifications

    The applicants holding a Master or Engineer degrees in physics, electronics, optics, lasers and related area. The candidates will ideally have basic training and knowledge covering the fields of physics, nonlinear optics, fiber optics, laser physics, optoelectronics, signal processing, and spectroscopy. Prior hands-on experience in experimental fiber optics, pulsed lasers and/or optical instrumentation would be desirable. Strong numerical competences with Matlab are desired for numerical modeling and experimental interfacing. Open- minded, curious and interested in working with both computer scientists and physicists. Ability to take initiative and work both in autonomy and in group.

    Specific Requirements

    Good writing skills and English level are required from the applicants. A basic level of French would be ideal to ensure effective communication.

    Contact Information
  • Organisation/Company: FEMTO-ST institute, CNRS, University of Bourgogne France-Comté
  • Department: Optics
  • Organisation Type: Public Research Institution
  • Website: https:// www. femto-st.fr/en/
  • E-Mail: thibaut.sylvestre@univ-fcomte.fr
  • Country: France
  • City: Besancon
  • Postal Code: 25030
  • Street: 15B avenue des montboucons
  • Mobile Phone: +33676353156
  • From this employer

    Recent blogs

    Recent news