Erlangen 2018 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 4: Pulsed Power - Laser-Beam Matter Interaction
K 4.2: Talk
Wednesday, March 7, 2018, 14:30–14:45, MB HS
Semiconductor Lasers Optically Pumped in the Tunnel Excitation Regime — •Richard Hollinger1,2, Valentina Shumakova3, Pavel Malevich3, Skirmantas Ališauskas3, Lukas Trefflich4, Robert Röder4, Audrius Pugžlys3, Andrius Baltuška3, Carsten Ronning4, Christian Spielmann1,2, and Daniil Kartashov1 — 1Institute of Optics and Quantum Electronics, Abbe Center of Photonics, University Jena, 07743 Jena, Germany — 2Helmholtz-Institut Jena, Helmholtzweg 4, 07743 Jena, Germany — 3Institute for Photonics, TU Vienna, Gußhausstrasse. 25-29, 1040 Vienna, Austria — 4Institute for Solid State Physics, University Jena, Max-Wien-Platz 1, 07743 Jena, Germany
Since the famous work of Albert Einstein at the beginning of the last century, we describe light matter interaction in the photon picture, i.e.the absorption of light depends only on the frequency of the photon and not on the intensity of the light wave. With the advent of intense lasers, multiphoton excitation has been realized, i.e. two or more low energy photons have to be absorbed simultaneously to excite an atom. There, excitation depends not only on the photon energy but also on the intensity of the incident light wave. Here, we show that further lowering the pump photon energy brings us into the regime of tunneling excitation. Now the excitation of atoms becomes (nearly) independent of the frequency but solely depends on the incident intensity of the light wave. Experimentally we confirm the wavelength and intensity scaling in the tunneling excitation regime by studying the visible emission of semiconductor nanolasers under mid-infrared pumping.