Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 62: Poster: Quantum Optics and Photonics III

Q 62.105: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

GaAs/AlGaAs Phase Modulator for 780 nm Lasers — •Bassem Arar¹, Hans Wenzel¹, Reiner Güther¹, Olaf Brox¹, Andre Maaßdorf¹, Andreas Wicht^1,2, Achim Peters^{1, 2}, Markus Weyers¹, Götz Erbert¹, and Günther Tränkle¹ — ¹Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany — ²Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin, Germany

Micro-integrated laser systems operating at the wavelength of 780 nm have recently received increasing attention. This is due to the growing efforts towards building very compact photonic components for Rubidium and Potassium atomic spectroscopy in the field and in space. Phase modulators are central building blocks in these devices. Integration of phase modulators into hybrid laser and spectroscopy modules provides very compact and robust systems. We present a GaAs/AlGaAs W-shaped phase modulator for the wavelength of 780 nm with very low optical losses (1.4 dB/cm). The modulation efficiency is determined to 16 Deg/(Vmm) using the FP interference method. The measured modulation bandwidth with a direct 50 Ohm source is about 30 MHz. The reduction of the modulator capacitance by one to two orders of magnitude seems feasible in the future so that the modulator could provide access to modulation frequencies beyond 1 GHz with direct driving. This work is supported by the German Space Agency DLR with funds provided by the Federal Ministry of Economics and Technology (BMWi) under grant number 50WM1141.