By Ki Young Kim
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Extra resources for Advances in Optical and Photonic Devices
Combining Directional Light Output and Ultralow Loss in Deformed Microdisks, Phys. Rev. Lett. 100, 033901 (2008) Yoon, J. H. , Single mode photonic quantum ring laser fabricated in hyperboloid drum shape, J. Appl. Phys. 103, 053103 (2008) 3 A Tunable Semiconductor Lased Based on Etched Slots Suitable for Monolithic Integration D. C. Byrne, W. H. Guo, Q. Lu and J. F. Donegan School of Physics, Trinity College Dublin Ireland 1. Introduction Widely tunable semiconductor lasers will play a critical part in future technologies.
The beam shapes are nearly Gaussian at 30um height and perfectly Gaussian at 60um height, which gives rise to a cross-over from Laguerre Gaussian to Gaussian at around 40~50um height. In our divergence analysis we may regard the PQR ring as a Bessel beam formed at the rim of the PQR device surface from an imaginative point light at the origin located deep below the device surface. Fig. 18. (a) Lambertian profile of a PQR (b) Divergence angle of a PQR (c) (d) and (e) represent beam scans taken at different heights, 0, 30, and 60 um For practical system applications of light sources one often has to find how to control, or focus and guide, the laser beam.
102, 053104(2007). Kim, J. Y. , Fabrication of Photonic Quantum Ring Laser using Chemically Assisted Ion Beam Etching, J. Vac. Sci. Technol. B. 19, 1334 (2001). Kim, J. Y. , Effect of surface treatment on leakage current of GaAs/AlGaAs laser microcavitys, Appl. Phys. Lett. 82, 4504 (2003). Kim, M. , Wet etching fabrication of photonic quantum ring laser, J. Appl. Phys. 96, 4742 (2004). Kim, Y. C. , PQR laser can outdo LED, IEEE-NMDC 2006 21-24 (2006), Gyeongju, Korea; Laser Focus World (March 2008).