论文信息 - Influence of surface roughness on the optical mode profile in GaN-based violet ridge waveguide laser diodes

Influence of surface roughness on the optical mode profile in GaN-based violet ridge waveguide laser diodes

We investigate the influence of the epitaxial layer roughness on the far-field profile of the optical mode in gallium Nitride-based, c-plane ridge waveguide laser diodes. Occasionally, we observe long-range growth instabilities leading to a periodical modulation of the surface. Amplitude and period of this surface roughness is typically on the order of a few 10nm and 20 μm, respectively. Using different characterization techniques, we investigate the influence of the surface roughness on the vertical mode profile along the fast axis in the far-field, in particular the contribution of light scattering at the rough waveguide interfaces, as well as that of substrate modes.

[1] A. Lell,et al. Analysis of perturbations in the lateral far-field of blue InGaN laser diodes , 2013 .

[2] Dietrich Marcuse,et al. Radiation losses of dielectric waveguides in terms of the power spectrum of the wall distortion function , 1969 .

[3] F. Payne,et al. A theoretical analysis of scattering loss from planar optical waveguides , 1994 .

[4] Effect of waveguide sidewall roughness on the threshold current density and slope efficiency of quantum cascade lasers , 2008 .

[5] E. Kapon,et al. Low-loss III-V semiconductor optical waveguides , 1991 .

[6] T. Yuasa,et al. Effect of Slight Misorientation of Sapphire Substrate on Metalorganic Chemical Vapor Deposition Growth of GaN , 1999 .

[7] B. Hakki,et al. Gain spectra in GaAs double−heterostructure injection lasers , 1975 .

[8] F. Payne,et al. Radiation loss from planar waveguides with random wall imperfections , 1990 .

[9] A. Lell,et al. Substrate Modes of (Al,In)GaN Semiconductor Laser Diodes on SiC and GaN Substrates , 2007, IEEE Journal of Quantum Electronics.

[10] B. W. Hakki,et al. cw degradation at 300°K of GaAs double-heterostructure junction lasers. II. Electronic gain , 1973 .

[11] Dietrich Marcuse,et al. Mode conversion caused by surface imperfections of a dielectric slab waveguide , 1969 .

[12] P. Tien. Light waves in thin films and integrated optics. , 1971, Applied optics.