.Multi-active region laser diode with a narrow beam divergence angle[J].Optoelectronics Letters,2006,2(5):326-328 Multi-active region laser diode with a narrow beam divergence angle Abstract:       A novel large optical cavity laser diode, which consists of multi-active regions cascaded together through tunnel junctions, is proposed. After growing the epi-layers with LP-MOCVD system on GaAs substrate, the ridge waveguide laser structure is fabricated, and it shows a transverse divergence angle as low as 14.4°. This work was supported by special foundations for major state basic research project of China(G20000683-02) Hits: 3389 Download times: 176 View Full Text    Download reader