Abstract
We designed a 1.06-µm single-quantum-well (SQW) InGaAs/AlGaAs planar tapered amplifier
that was injected with seed light of a fiber Bragg grating stabilized laser
diode through a fiber biconical microlens. To increase the amplifier output,
the microlens with approximately 3- and 11-µm radii on vertical and horizontal axes,
respectively, provides high coupling efficiency between the laser diode and
the amplifier. The microlens also controls propagation in the tapered gain
area to suppress the filament formation. In addition, the small radii of the
microlens reduce near-end reflection at the amplifier input to prevent parasitic
laser oscillation of the amplifier. We demonstrated near-diffraction-limited
output of 5.5 W with the beam quality factor M<sup>2</sup> of 1.5 by using a 3-mm-long amplifier having
an optical confinement factor of 1.2%.
© 2008 IEEE
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