Herter, Alexa

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Alexa
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Ultrabroadband Moth-Eye Antireflection Structures on GaSe Produced by Focused-Ion Beam Milling

2021, Sulzer, Philipp, Hagner, Matthias, Liehl, Andreas, Cimander, Moritz, Kempf, Hannes, Bitzer, Annegret, Herter, Alexa, Leitenstorfer, Alfred

Minimizing losses and suppression of reflection-induced echos in thin nonlinear crystals is of critical importance to both classical time-domain spectroscopy and time-domain quantum electrodynamics [1] . GaSe represents an important material in this context. However, it is challenging to coat and manipulate using macroscopic methods due to its van-der-Waals-bonded structure of hexagonal monolayers and atomically flat surfaces. At least, some progress relying on femtosecond laser ablation was demonstrated recently [2] .

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Ultrabroadband suppression of mid-infrared reflection losses of a layered semiconductor by nanopatterning with a focused ion beam

2021, Hagner, Matthias, Sulzer, Philipp, Liehl, Andreas, Cimander, Moritz, Kempf, Hannes, Bitzer, Annika, Herter, Alexa, Leitenstorfer, Alfred

Moth-eye structures are patterned onto gallium selenide surfaces with sub-micrometer precision. In this way, Fresnel reflection losses are suppressed to below one percent within an ultrabroad optical bandwidth from 15 to 65 THz. We tune the geometry by rigorous coupled-wave analysis. Subsequently, ablation with a Ga+ ion beam serves to write optimized structures in areas covering 30 by 30 μm. The benefits are demonstrated via optical rectification of femtosecond laser pulses under tight focusing, resulting in emission of phase-stable transients in the mid-infrared. We analyze the performance of antireflection coating directly in the time domain by ultrabroadband electro-optic sampling.

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High-Field Multi-THz Transients Generated from a Sub-Ps Yb:YAG Thin-Disk System

2019-09, Heinrich, Alexander-Cornelius, Herter, Alexa, Brida, Daniele, Leitenstorfer, Alfred

An Yb:thin-disk laser delivering 615 fs pulses with 17 mJ energy at 3 kHz is harnessed towards generation of single-cycle multi-THz transients with few hundred MV/cm field strength via chirped-pulse difference frequency mixing in large-aperture GaSe crystals.