Phd Track Master Internship: Spatiotemporal Shaping Of Ultrafast Laser-Induced Shockwaves

25 Oct 2023

Job Information

Organisation/Company

LP3 CNRS-AMU

Research Field

Engineering » Process engineering

Physics » Optics

Physics » Applied physics

Researcher Profile

First Stage Researcher (R1)

Country

France

Application Deadline

29 Dec 2023 - 12:00 (Europe/Paris)

Type of Contract

Temporary

Job Status

Full-time

Hours Per Week

35

Offer Starting Date

1 Mar 2024

Is the job funded through the EU Research Framework Programme?

Not funded by an EU programme

Is the Job related to staff position within a Research Infrastructure?

No

Offer Description

Today, we use lasers to generate conditions similar to those in hot cores of stars and planets on a tabletop optical experiment. To do so, we employ ultrashort laser pulses capable of generating extremely high optical intensities in the 1014 W/cm2 range. At such intensities, an initially- transparent material transforms locally into a dense plasma. Strong pressure- temperature gradients build up inside the volume of the irradiated area that result in a violent decompression through emission of a shockwave 1. Stress generated by the passage of the shockwave inside a material may permanently change its structure and laser-transform it in a new denser phase. A plethora of novel applications would then become possible (MEMS, MOEMS etc.) within a direct microfabrication technique with 3D abilities.

The object of this internship is to investigate different ways of controlling laser-generated shockwave propagation in glasses. To do so, the student will explore laser beam shaping techniques based on the spatiotemporal modulation of the laser field. Fixed phase plates will be used first to Bessel-Vortex transform a gaussian beam. A first demonstration will be the obtention of controlled hollow cylinder-shaped modifications inside the bulk of a fused silica glass sample. We will then seek for increased flexibility on the beam shaping by implementing a commercial spatial light modulator to allow precise control over the Bessel-Vortex ring thickness and diameter. Finally, we will characterize the resulting shockwave by time-resolved optical microscopy. The recruited student will use an existing setup at LP3 as a starting block that is used for the generation and characterization of Bessel beams 2. This setup uses the ASUR laser facility at LP3 delivering infrared (λ=800 nm) pulses with 30 fs pulse duration and a pulse energy of 15 mJ.

This project is an excellent opportunity to develop skills in a multidisciplinary field of Physics (Plasma Physics, Lasers, Thermodynamics, Mechanics etc.) and engineering. The student should have a strong background in Optics and/or Materials Science. A taste for experimental physics is necessary. Depending on the outcome, the recruited student may benefit from acquired funding for conducting a PhD study on the subject.

1 O. Koritsoglou, D. Loison, O. Uteza, and A. Mouskeftaras, “Characteristics of femtosecond laser-induced shockwaves in air,” Opt. Express , vol. 30, no. 21, p. 37407, 2022.

2 X. Liu, R. Clady, D. Grojo, O. Utéza, and N. Sanner, “Engraving Depth‐Controlled Nanohole Arrays on Fused Silica by Direct Short‐Pulse Laser Ablation,” Adv. Mater. Interfaces , vol. 2202189, p. 2202189, 2023.

Requirements

Research Field

Engineering » Electrical engineering

Education Level

Master Degree or equivalent

Research Field

Physics » Applied physics

Education Level

Master Degree or equivalent

Languages

ENGLISH

Level

Good

Additional Information Work Location(s)

Number of offers available

1

Company/Institute

LP3-CNRS/AMU

Country

France

Geofield

Where to apply

E-mail

[email protected]

Contact

City

Marseille

Website

https:// www. lp3.fr

Street

163 avenue de Luminy

Postal Code

13009

STATUS: EXPIRED