Analysis of mode characteristics for equilateral triangle semiconductor microlasers with imperfect boundaries

The influence of imperfect boundaries on the mode quality factor is investigated for equilateral-triangle-resonator (ETR) semiconductor microlasers by the finite difference time domain technique and the Pade approximation with Bakerʹs algorithm. For 2-D ETR with a refractive index of 3.2 and side length of 5 (mu)m, the confined modes can still have a quality factor of about 1000 as small triangles with side length of 1 (mu)m are cut from the vertices of the ETR. For a deformed 5 (mu)m ETR with round vertices and curve sides, the simulated mode quality factors are comparable to the measured results.