Abstract
In this Letter, we present a tunable Y-branch hybrid master oscillator power amplifier (MOPA) with 5.5W output power, emitting between 973.7 and 983.4nm. 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 2.2nm. Each branch can be electrically tuned by up to 7.5nm of quasi-continuous wavelength tuning, which in combination covers up to 9.7nm 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 17pm. 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.
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