Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 56: Poster VII

Q 56.30: Poster

Thursday, March 14, 2024, 17:00–19:00, KG I Foyer

Red-Emitting DBR Laser for Strontium-Based Optical Atomic Clocks — •Sandy Szermer, Nora Goossen-Schmidt, Bassem Arar, Ahmad Bawamia, Jörg Fricke, Jonas Hamperl, Karl Häusler, Andre Maaßdorf, Christoph Pyrlik, Max Schiemangk, Hans Wenzel, Andrea Knigge, and Andreas Wicht — Ferdinand-Braun-Institut, Leibnitz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin

Strontium (Sr)-based optical atomic clocks provide promising applications such as improved satellite navigation or fundamental research e.g. redefining the unit of time.

To deliver the repumping wavelengths for a compact, transportable Sr lattice optical clock, we have developed red-emitting distributed Bragg reflector (DBR) ridge waveguide (RW) lasers at 679 nm and 707 nm. A higher-order surface Bragg grating is monolithically incorporated into a section of the RW to achieve frequency selectivity and low frequency noise. We optimised the design of the DBR laser with respect to gain section length and front facet reflectivity. For both wavelengths, the lasers reach FWHM linewidths (β-separation method) of around 1 MHz at optical output powers of more than 70 mW. We present the current status of our work and discuss ongoing life tests for the assessment of the operational reliability.

This work was supported by DLR Space Administration with fund provided by the Federal Ministry for Economic Affairs and Climate Action under grant number 50WM2152 and 50WM2351C.

Keywords: optical atomic clock; DBR laser; 679 nm; 707 nm; Sr spectroscopy