Double-pulse Laser-induced Forward Transfer
Description
To solve the limitations of Laser-induced Forward Transfer (LIFT), a double pulse LIFT (DP-LIFT) approach has been developed in this thesis. In this process, a first long pulse laser irradiation creates a melted metal pool and a second ultrashort pulse induces the fluid motion and initiates the jetting transfer. This thesis provides a detailed experimental study on the DP-LIFT process. The influence of double pulse parameters on the jetting phenomena has been carefully studied by means of various observation methods. To predict the jetting behaviors, an energy balanced model has been used. Moreover, we demonstrated that for some configurations of the respective diameters of the two lasers, focused nano-jets are generated from the melting pool. Finally, from a fixed thickness of the donor film, debris-free single droplets with diameters ranging from 670 nm to 6.0 μm have been printed with high reproducibility. 2.5 D pillars matrix are printed to demonstrate the potential of the double pulse LIFT method for the fabrication of 3D microstructures. (author)
Abstract (French)
Pour resoudre la limitation inherente au procede d'impression laser LIFT, une approche utilisant une double impulsion (DP-LIFT) a ete developpee au cours de cette these. Dans ce processus, une irradiation laser de duree de quelques dizaines de microsecondes cree un bain de metal en fusion et une seconde impulsion ultra-breve induit le mouvement du fluide, la formation d'un jet ou d'une goutte et le transfert du metal liquide. Cette these presente une etude experimentale detaillee sur le processus DP-LIFT. L'influence des parametres des deux irradiations laser a ete etudiee en s'appuyant sur un ensemble de methodes d'observation. Pour etudier l'influence de ces parametres sur la dynamique de l'ejection, un modele base sur la conservation de l'energie a ete utilise. De plus, nous avons demontre que, pour certaines configurations des diametres respectifs des deux spots lasers, des nanojets focalises etaient generes. Enfin, en conservant une epaisseur fixe du film metallique, des gouttelettes uniques, sans debris, d'un diametre allant de 670 nm a 6,0 μm ont ete imprimees avec une reproductibilite elevee. des matrices de piliers ont egalement ete imprimees pour demontrer le potentiel de la methode LIFT a double impulsion pour la fabrication de micro-structures 3D. (auteur)
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Additional details
Additional titles
- Original title (English)
- Impression nanometrique par laser
Publishing Information
- Imprint Pagination
- 140 p.
- Report number
- FRNC-TH--11437
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 52015145
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- ABLATION; COPPER; DROPLETS; EVAPORATION; IMAGE PROCESSING; JETS; MELTING; MICROSTRUCTURE; NANOSTRUCTURES; NEODYMIUM LASERS; PULSES; TEMPERATURE DISTRIBUTION; THIN FILMS
- Descriptors DEC
- ELEMENTS; FILMS; LASERS; METALS; PARTICLES; PHASE TRANSFORMATIONS; PROCESSING; SOLID STATE LASERS; TRANSITION ELEMENTS
Optional Information
- Notes
- 135 refs.; Available from the INIS Liaison Officer for France, see the INIS website for current contact and E-mail addresses