Continuous-wave operation of 1.5 μm InGaAs/InGaAsP/InP quantum dot lasers at room temperature -: art. no. 083110

Continuous-wave operation at room temperature from InGaAs/InGaAsP/InP quantum dot (QD) laser diodes (LD) has been achieved. A ridge waveguide QD LD with 7 QD-stacks in the active region lases at 1.503 mu m at 20 degrees C and that with 5 QD-stacks lases at 1.445 mu m at room temperature. The shift in lasing wavelength is believed to be due to the difference in the quantized energy states involved in producing gain for lasing. With smaller number of QD stacks and shorter cavity length, the lasing wavelength shifts to shorter wavelength indicating that more of higher excited states are involved in producing gain. By increasing the number of QD stacks to 15, lasing at 1.56 mu m has been achieved under pulsed mode. (c) 2005 American Institute of Physics.