Optimization of laser energy deposition for single-shot high aspect-ratio microstructuring of thick BK7 glass

Journal Article · Thu Jul 07 00:00:00 EDT 2016 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4954890· OSTI ID:22597884

Garzillo, Valerio; Grigutis, Robertas ^[1]; Jukna, Vytautas ^[2]; Couairon, Arnaud ^[2]; Di Trapani, Paolo ^[3]; Jedrkiewicz, Ottavia ^[4]

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1. Dipartimento di Scienza e Alta Tecnologia, University of Insubria, Via Valleggio 11, I-22100 Como (Italy)
2. Centre de Physique Theorique, CNRS, Ecole Polytechnique, Université Paris-Saclay, F-91128 Palaiseau (France)
3. Dipartimento di Scienza e Alta Tecnologia, University of Insubria and CNISM UdR Como, Via Valleggio 11, I-22100 Como (Italy)
4. Istituto di Fotonica e Nanotecnologie, CNR and CNISM UdR Como, Via Valleggio 11, I-22100 Como (Italy)

We investigate the generation of high aspect ratio microstructures across 0.7 mm thick glass by means of single shot Bessel beam laser direct writing. We study the effect on the photoinscription of the cone angle, as well as of the energy and duration of the ultrashort laser pulse. The aim of the study is to optimize the parameters for the writing of a regular microstructure due to index modification along the whole sample thickness. By using a spectrally resolved single pulse transmission diagnostics at the output surface of the glass, we correlate the single shot material modification with observations of the absorption in different portions of the retrieved spectra, and with the absence or presence of spectral modulation. Numerical simulations of the evolution of the Bessel pulse intensity and of the energy deposition inside the sample help us interpret the experimental results that suggest to use picosecond pulses for an efficient and more regular energy deposition. Picosecond pulses take advantage of nonlinear plasma absorption and avoid temporal dynamics effects which can compromise the stationarity of the Bessel beam propagation.

• OSTI ID: 22597884
• Journal Information: Journal of Applied Physics, Vol. 120, Issue 1; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ASPECT RATIO
BEAMS
BESSEL FUNCTIONS
COMPUTERIZED SIMULATION
ENERGY ABSORPTION
ENERGY LOSSES
GLASS
LASERS
MICROSTRUCTURE
NONLINEAR PROBLEMS
OPTIMIZATION
PULSES
SPECTRA
SURFACES
THICKNESS