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HL: Fachverband Halbleiterphysik

HL 94: Poster IV A (Laser; Devices; Heterostructures; Surfaces, interfaces and defects)

HL 94.5: Poster

Donnerstag, 19. März 2015, 14:00–20:00, Poster B

DFB-Master-Oscillator-Power-Amplifier system for high precision optical sensors — •Anja Kohfeldt¹, Mandy Krüger¹, Max Schiemangk^1,2, Andreas Wicht^1,2, Götz Erbert¹, Achim Peters^1,2, 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

We have developed hybrid integrated DFB-Master-Oscillator-Power-Amplifier modules (MOPA) for portable quantum optical sensors. This application typically requires the optical frequency of the laser to be stabilized to δ ν / ν = 10⁻¹⁰, in some cases even down to 10⁻¹⁵. Frequency stabilization is commonly realized by controlling (modulating) the injection current of the laser diodes. In order to enable high servo bandwidths as mentioned above, the module hosts an electrical interface for a close-to-chip RF modulation.

We will present a MOPA module designed for rubidium spectroscopy at 780 nm achieving an optical output power > 1 W (cw) and an intrinsic linewidth of < 50 kHz. Furthermore, we discuss the transfer functions of the system for modulation of the injection current of both the master oscillator and the power amplifier.

This work is supported by the German Space Agency DLR with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) under the grant numbers 50WM1134 and 50WM1240.