Continuous-Wave Operation of Pure Blue AlGaN-Cladding-Free Nonpolar InGaN/GaN Laser Diodes

Abstract

We present the first reported continuous-wave (CW) operation of pure blue AlGaN-cladding-free (ACF) nonpolar m-plane InGaN/GaN laser diodes (LDs). CW lasing was achieved at a wavelength of 461 nm and a threshold current density of 4.1 kA/cm2 for LDs with an InGaN-based separate confinement heterostructure (SCH) waveguide design. The devices showed a 9 nm/decade blue-shift of spontaneous emission wavelength with increasing current density, a characteristic temperature of 156 K, a red-shift with increasing stage temperature of 0.05 nm/K, and an estimated thermal impedance of 60 K/W.