Compact High Power Diode Laser MOPA System With 5.5 nm Wavelength Tunability
M. Tawfieq, A. Müller, J. Fricke, P. Della Casa, P. Ressel, A. Ginolas, D. Feise, B. Sumpf, and G. Tränkle
IEEE Photonics Technol. Lett., vol. 29, no. 22, pp. 1983-1986 (2017).
A hybrid master oscillator power amplifier (MOPA) diode laser with 6.2 W output power at 971.8 nm is presented. It consists of a distributed Bragg reflector (DBR) laser, which is collimated and focused into a tapered amplifier using cylindrical micro-lenses. The emitted light has a spectral width of about 20 pm and a propagation factor of M21/e2 = 1.3 in the slow axis. The emission is nearly diffraction limited with 79% of the total power within the central lobe (4.9 W diffraction limited). The MOPA system, including the micro-lenses, is realized on a compact conduction cooled package with a footprint of 25 mm × 25 mm. In addition, a micro-heater is embedded on top of the DBR-grating, which can provide up to 5.5 nm of electrical wavelength tuning. The output power is thoroughly constant (6.22 W ± 0.01 W) over the entire tuning range.
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany
Diode lasers, distributed feedback devices, semiconductor optical amplifiers, laser tuning, micro-optics.
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