@article{CTT100833041,
  author = {Ahmed M. A. Hassan and Moustafa Ahmed and Masanori Nakahama and Fumio Koyama},
  title = {High-power, quasi-single-mode vertical-cavity surface-emitting laser with near-diffraction-limited and low-divergence beam},
  journal = {Japanese Journal of Applied Physics},
  year = 2020,
}

@inproceedings{CTT100843408,
  author = {H. R. Ibrahim and Ahmed M. A. Hassan and M. Ahmed and F. Koyama},
  title = {Single-mode and High-speed Intracavity Metal Aperture VCSEL with Transverse Coupled Cavity Effect},
  booktitle = {},
  year = 2020,
}