Spatial filtering of a six-wavelength DBR-RW laser in a MOPA system

M. Tawfieq*, J. Fricke, C. Stölmacker, P. Della Casa, P. E. Andersen, B. Sumpf, G. Tränkle

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Lasing emission at multiple wavelengths can be used in different sensing applications and in optical telecommunication. In this work, we report a six-wavelength distributed Bragg reflector (DBR) laser, emitting around 976 nm with six ridge waveguide (RW) structures, where individual DBR gratings are combined into a common front section. These six elements are individually addressable and biased one at a time for individual wavelength selection. The drawback of this RW combination is observable in spatial characteristics where higher-order modes are supported. We addressed this issue by using a master oscillator power amplifier (MOPA) system that combines the six-wavelength MO laser with a tapered PA. Through this configuration, the PA acts as a spatial filter of the MO beam, providing a nearly diffraction-limited beam with M2 1/e 2 < 1.5. In addition, the described MOPA system provides output powers around 4 W with spectral single-mode operation, with up to 9.36 nm of thermal wavelength tuning. We believe that the described MOPA configuration can be used in different applications, such as absorption spectroscopy.
Original languageEnglish
JournalApplied Optics
Issue number7
Pages (from-to)1864
Number of pages1
Publication statusPublished - 2021


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