Abstract
AlGaInAs/InP coupled-circular microlasers with radius of 10- and 2-μm width
middle bus waveguide are fabricated by photolithography and inductively coupled
plasma etching techniques. Room-temperature continuous-wave single-mode operation is
realized with an output power of 0.17 mW and a side-mode suppression ratio of 23 dB
at 45 mA. A longitudinal mode interval of 11 nm is obtained from the lasing spectra,
and mode Q factor of 6.2×103 is estimated from 3-dB width of a minor peak near the
threshold current. The mode characteristics are simulated by finite-difference
time-domain technique for coupled-circular resonators. The results show that, in
addition to the coupled modes, high-radial-order whispering gallery modes with
travelling wave behaviors can also have high Q factors in the coupled-circular
resonators with a middle bus waveguide.
© 2012 Chinese Optics Letters
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