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).
- Ionization avalanching in clusters ignited by extreme-ultraviolet driven seed electrons Physical Review Letters 116 (2016) 033001/1-5
- Quantitative estimate of fs-laser induced refractive index changes in the bulk of various transparent materials SPIE Proceedings Series 9132 (2014) 91320X/1-5
- Femtosecond-laser induced ablation of silicate glasses and the intrinsic dissociation energy Optical Materials Express 4 (2014) 689-700
- Formation dynamics of ultra-short laser induced micro-dots in the bulk of transparent materials Physics Procedia 41 (2013) 769-773
- Time-resolved microscopy with random lasers Optics Letters 38 (2013) 4112-4115
- Structural modifications of binary lithium silicate glasses upon femtosecond laser pulse irradiation probed by micro-Raman spectroscopy Optical Materials Express 3 (2013) 755-764
- Photoinscription domains for ultrafast laser writing of refractive index changes in BK7 borosilicate crown optical glass Optical Materials Express 3 (2013) 67-85
- Nonlinear absorption and refraction of binary and ternary alkaline and alkaline earth silicate glasses Optical Materials Express 3 (2013) 2132-2140
- Nonlinear optical properties of binary and ternary silicate glasses upon near-infrared femtosecond pulse laser irradiation AIP Conference Proceedings 1464 (2012) 660-670
- Time-resolved study of fs laser-induced plasma in bulk a-SiO2 AIP Conference Proceedings 1464 (2012) 620-627