Blue-green laser diodes exhibiting continuous-wave operation during hundreds-of-seconds have been fabricated. This structure is a ZnCdSe/ZnSSe/ZnMgSSe separate-confinement heterostructure with low dislocation density of ∼10⁵ cm^-2 in the n-ZnMgSSe cladding layer. The use of a GaAs buffer layer has lead to the decrease of dislocation density for laser-diodes, with which we have observed CW operation up to 80° C, that showed the feasibility of ZnCdSe/ZnSSe/ZnMgSSe SCH laser-diodes.

Room temperature pulsed operation of ZnCdSe/ZnSe/ZnMgSSe separate-confinement heterostructure (SCH) lasers has been achieved in a wavelength range from 485.7 to 521.6 nm. We have achieved shorter wavelength blue at room temperature than thus far reported. A decrease in threshold current density J _th and a increase in the slope efficiency for ZnCdSe/ZnSe/ZnMgSSe SCH laser diodes were observed as the energy difference between the active and cladding layers was increased. We determined that more than 0.35 eV for ΔE _g is necessary in order to suppress the carrier overflow. A high characteristic temperature T ₀ of 217 K was achieved for a laser diode with ΔE _g of 0.40 eV.

We have studied nanopatterns induced by nanosecond pulsed laser irradiation on (111) plane surfaces of a polycrystalline iron-aluminum alloy and evaluated their magnetic properties. Multiple nanosecond pulsed laser irradiation induces a wavelength-dependent surface transformation of the lattice structure from a B2-type to a supersaturated body centered cubic lattice. The selective formation of surface nanopatterns consisting of holes, stripes, polygonal networks, and dot-like nanoprotrusions can be observed. Furthermore, focused magneto-optical Kerr effect measurements reveal that the magnetic properties of the resultant nanostructured region changes from a paramagnetic to a ferromagnetic phase in accordance with the number of laser pulses.