论文信息 - Laterally Coupled InGaN/GaN DFB Laser Diodes

Laterally Coupled InGaN/GaN DFB Laser Diodes

For group III nitride-based lasers a new approach to realise DFB lasers and arrays is presented. Laterally coupled DFB (LC-DFB) lasers are realised to minimise processing-induced damage and to enable post-processing adjustment of DFB laser parameters according to the material parameters achieved after epitaxial growth. These DFB laser arrays enable one to measure the threshold and the refractive index of electrically pumped DFB lasers over a wavelength emission range of 6 nm. DFB emission is demonstrated up to 70 °C and simultaneously a small temperature shift of the DFB mode. A significantly smaller tuning range is observed compared to optically pumped DFB lasers as well as a significantly red-shifted gain region. Furthermore, the dispersion relation gradient determined, dn eff /dλ, appears significantly steeper (by a factor of six) than in the optically pumped case. These effects are attributed to incompletely screened polarisation fields in electrically pumped InGaN/GaN lasers.

[1] F. Scholz,et al. Realization and characterization of optically pumped GaInN-GaN DFB lasers , 1997 .

[2] S. Nakamura,et al. InGaN-Based Multi-Quantum-Well-Structure Laser Diodes , 1996 .

[3] Daniel Hofstetter,et al. Room-temperature pulsed operation of an electrically injected InGaN/GaN multi-quantum well distributed feedback laser , 1998 .

[4] V. Härle,et al. REALIZATION OF OPTICALLY PUMPED SECOND-ORDER GAINN-DISTRIBUTED-FEEDBACK LASERS , 1996 .

[5] M. Neuner,et al. Optically pumped GaInN/GaN-DFB lasers: overgrown lasers and vertical modes , 1999 .

[6] G. Hasnain,et al. Modeling of GaN optoelectronic devices and strain-induced piezoelectric effects , 2001 .

[7] Akito Kuramata,et al. InGaN Laser Diode Grown on 6H–SiC Substrate Using Low-Pressure Metal Organic Vapor Phase Epitaxy , 1997 .

[8] Johann Peter Reithmaier,et al. Low-threshold high-quantum-efficiency laterally gain-coupled InGaAs/AlGaAs distributed feedback lasers , 1999 .

[9] L. Coldren,et al. Electrically pumped distributed feedback nitride lasers employing embedded dielectric gratings , 1999 .

[10] Daniel Hofstetter,et al. Demonstration of an InGaN/GaN-based optically pumped multiquantum well distributed feedback laser using holographically defined third-order gratings , 1998 .

[11] B. Hahn,et al. First European GaN‐Based Violet Laser Diode , 2000 .

[12] B. Hahn,et al. GaN-Based LEDs and Lasers on SiC , 2000 .