Extended 9.7  nm tuning range in a MOPA system with a tunable dual grating Y-branch laser

M. Tawfieq, A. Müller, J. Fricke, P. Della Casa, P. Ressel, D. Feise, B. Sumpf, and G. Tränkle

Published in:

Opt. Lett., vol. 42, no. 20, pp. 4227-4230 (2017).

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In this Letter, we present a tunable Y-branch hybrid master oscillator power amplifier (MOPA) with 5.5 W output power, emitting between 973.7 and 983.4 nm. The MO is a monolithic Y-branch distributed Bragg reflector (DBR) diode laser, which is collimated and coupled into a tapered amplifier using cylindrical microlenses in a compact 25 mm×25 mm conduction cooled laser package. The wavelength spacing between the two laser branches is 2.2 nm. Each branch can be electrically tuned by up to 7.5 nm of quasi-continuous wavelength tuning, which in combination covers up to 9.7 nm of spectral range. Over this range, an output power variation of 0.5% and 0.2% is observed for the left and right arms, respectively, while maintaining a spectral width of less than 17 pm. In addition, the MOPA system can be operated as a dual-wavelength system by operating both branches simultaneously. The presented device is suitable for nonlinear frequency conversion applications.

Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany

OCIS codes:

(140.3490) Lasers, distributed-feedback; (250.5980) Semiconductor optical amplifiers; (140.3600) Lasers, tunable; (130.3990) Micro-optical devices.