Analysis of semiconductor microlasers with an equilateral triangle resonator by rate equations

Semiconductor microlasers with an equilateral triangle resonator (ETR) are analyzed by rate equations with the mode lifetimes calculated by the finite-difference time-domain technique and the Pade approximation. A gain spectrum based on the relation of the gain spectrum and the spontaneous emission spectrum is proposed for considering the mode selection in a wide wavelength span. For an ETR microlaser with a side length of about 5 /spl mu/m, we find that single fundamental mode operation at about 1.55 /spl mu/m can be obtained as the side length increases from 4.75 to 5.05 /spl mu/m. The corresponding wavelength tuning range is 93 nm, and the threshold current is about 0.1 to 0.4 mA.