Coherent ring VCSELs for high power, narrow linewidth applications

The coherent ring VCSEL (CR-VCSEL) structure developed at Dallas Quantum Devices is a monolithic, narrow linewidth high power device configuration that can be fabricated using typical VCSEL epitaxy and conventional processing techniques. So far, CR-VCSELs have demonstrated CW output power greater than 500mW with linewidths less than 0.2nm, power conversion efficiency greater than 30%, with full angle divergence angle less than 10 degrees. In applications where they are appropriate, CR-VCSELs should enjoy significant cost advantages over other high power, narrow linewidth semiconductor laser configurations.