Member of project 3.2 "Solids and Nanostructures: Electrons, Spins, and Phonons"
The activity of our research group is centered around the direct laser writing of 3d micro-optical systems in solid transparent materials with fs-laser pulses. Our activity is divided in the two topics of (i) Fundamentals of the laser-matter interaction during microprocessing with ultrashort laser pulses and (ii) Direct laser printing of photonic structures with ultrafast laser pulses.
Topic (i) aims at:
- determining which fundamental mechanisms prevail during plasma formation with ultrashort pulses
- studying the relaxation processes leading to structural modifications, for instance thermal transients and defect formation.
Topic (ii) deals with the fabrication of functional micro-optical systems, mainly in the bulk of fused silica. The main applications include:
- Long term data storage
- Direct part marking under the surface
- Printing of integrated optical sensors
Since 2015: Principal Investigator on a DFG-funded research project entitled “Micromachining with few-cycle pulses”
2009-: Research associateat the Max-Born Institute, Berlin. Developed, designed and tested advanced optical methods for the characterization of femtosecond-laser induced micro- and nanostructures in the volume of transparent materials: phase-contrast microscopy, quantitative phase-shift interferometry, time-resolved microscopy with random lasers.
2008-2009: Project associateoptics/sensors,Hella Aglaia Mobile Vision GmbH, Berlin. Participated in the development of a front camera for car driver assistance, designed and tested an optical method able to measure the modulation transfer function of the cameras in a production environment.
2007-2008: Research associate,Princeton University, Princeton, NJ, USA. Developed and characterized a new generation of adaptive optics components based on tunable acoustic lenses. Demonstrated applications in imaging (microscopy, fast zoom lens) and non imaging optics (beam focusing, spatial beam shaping). Promoted devices to investors and users. Participated in device patenting. Technology commercially available (www.tag-optics.com).
- Single-pulse ultrafast laser imprinting of axial dot arrays in bulk glasses Optics Letters 36 (2011) 325-327
- Time-resolved imaging of laser-induced refractive index changes in transparent media Review of Scientific Instruments 82 (2011) 033703/1-8
- Time-resolved imaging of bulk a-Si02 upon various ultrashort excitation sequences SPIE Proceedings Series 7925 (2011) 79250R/1-7
- 3D-adaptive spatio-temporal control of laser-induced refractive index changes in optical glasses SPIE Proceedings Series 7921 (2011) 79210H/1-10
- Optimization of the energy deposition in glasses with temporally-shaped femtosecond laser pulses Physics Procedia 12 (2011) 76-81
- Nanosize structural modifications with polarization functions in ultrafast laser irradiated bulk fused silica Optics Express 18 (2010) 24809-24824
- Dynamics of femtosecond laser induced voidlike structures in fused silica Applied Physics Letters 94 (2009) 041911/1-3
- Size corrections during ultrafast laser induced refractive index changes in bulk transparent materials Journal of Laser Micro/Nanoengineering 4 (2009) 45-50
- Size correction in ulrafast laser processing of fused silica by temporal pulse shaping Applied Physics Letters 93 (2008) 021921/1-3
- Designing laser-induced refractive index changes in "thermal" glasses SPIE Proceedings Series 7005 (2008) 700518/1-4