Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.25: Poster

Mittwoch, 22. März 2017, 15:00–19:00, P1A

A stable laser for interferometric spin noise and high precision absorption spectroscopy
— •Selina Volkert, Michael Beck, Jens Hübner, and Michael Oestreich — Institut für Festkörperphysik, Leibniz Universität Hannover, Appelstrasse 2, D-30167 Hannover

The inherent fluctuations of external cavity diode lasers impede the next generation interferometrically enhanced homodyne detection of spin noise at low frequencies [1]. To reduce its phase and frequency fluctuations by means of the Pound-Drever-Hall technique we will stabilize an external cavity diode laser onto a self-built and characterized high finesse Fabry-Perot reference cavity made from ultra low expansion glass. We will show the indispensability of this kind of stabilized laser for amplified detection of spin noise in the kHz frequency domain [2]. Furthermore, we will demonstrate the capabilities of the complete system by high resolution absorption spectroscopy of defect bound excitons in isotopically enriched silicon which inherently exhibits an ultra narrow homogeneous linewidth below 1 MHz [3].

[1] S. Cronenberger et al., Rev. Sci. Instr. 87, 093111, (2016).
R. Dahbashi et al., Phys. Rev. Lett. 112, 156601 (2014).
A. Yang et al., Appl. Phys. Lett. 95, 122113 (2009).