Circular polarization spin semiconductor laser using magnetic semiconductor and laser beam generating method

A method of generating a laser light, comprising:

• preparing a spin-based semiconductor laser source for generating a circularly polarized laser light, comprising:
• a pair of p-type and n-type half-metal ferromagnetic semiconductor layers each made of a magnetic semiconductor which has a matrix consisting of either one of zinc oxide (ZnO), group III-V compound semiconductor and group II-VI compound semiconductor, and contains a transition metal atom:
• an active layer having a multi-Quantum well structure interposed between said p-type and n-type half-metal ferromagnetic semiconductor layers;
• and means for allowing a spin-polarized hole and a spin-polarized electron to be introduced into said active layer through current injection;
• and
• applying a different one of negative and positive voltages to said p-type and n-type half-metal ferromagnetic semiconductor layers to form a hole spin-polarized in a forward direction and an electron spin-polarized in a backward direction, respectively in said p-type and n-type half-metal ferromagnetic semiconductor layers, and inject said hole and electron into said active layer therefrom so as to cause the recombination between said hole and electron in said active layer to generate a circularly polarized laser light from said semiconductor laser source.