19 February 2018 5.5nm wavelength-tunable high-power MOPA diode laser system at 971 nm
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In this work, a widely tunable hybrid master oscillator power amplifier (MOPA) diode laser with 6.2 W of output power at 971.8 nm will be presented. The MO is a DBR laser, with a micro heater embedded on top of the DBR grating for wavelength tunability. The emitted light of the MO is collimated and coupled into a tapered amplifier using micro cylindrical lenses, all constructed on a compact 25 mm ⨯ 25 mm conduction cooled laser package. The MOPA system emits light with a measured spectral width smaller than 17 pm, limited by the spectrometer, and with a beam propagation factor of M2 1/e2 = 1.3 in the slow axis. The emission is thus nearly diffraction limited with 79% of the total power within the central lobe (4.9 W diffraction limited). The electrically controlled micro-heater provides up to 5.5 nm of wavelength tunability, up to a wavelength of 977.3 nm, while maintaining an output power variation of only ± 0.16 % for the entire tuning range.
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Mahmoud Tawfieq, Mahmoud Tawfieq, André Müller, André Müller, Jörg Fricke, Jörg Fricke, Pietro Della Casa, Pietro Della Casa, Peter Ressel, Peter Ressel, Arnim Ginolas, Arnim Ginolas, David Feise, David Feise, Bernd Sumpf, Bernd Sumpf, Günther Tränkle, Günther Tränkle, } "5.5nm wavelength-tunable high-power MOPA diode laser system at 971 nm", Proc. SPIE 10553, Novel In-Plane Semiconductor Lasers XVII, 105531F (19 February 2018); doi: 10.1117/12.2289521; https://doi.org/10.1117/12.2289521

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