Realization of extended ultrabroadband quantum-dash laser emission using postgrowth intermixing

We demonstrate a widened ultrabroad-stimulated emission in InAs/InAlGaAs quantum-dash laser using the postgrowth lattice-intermixing technique. The 100 nm wavelength blue-shifted device exhibits larger lasing bandwidth (~41 nm) than as-grown laser (~25 nm) with a spectral ripple of <1 dB.