"J. Hayakawa,A. Murakami,D. Tominaga,Y. Suzuki,.Z. Ho,X. Gu,F. Koyama","Watt-class high-power and high-beam-quality VCSEL amplifiers","SPIE Photonics West",,,,,,2019,Feb.
"Zeuku Ho,Junichiro Hayakawa,Keisuke Shimura,Keisuke Kondo,Xiaodong Gu,Akihiro Matsutani,Akemi  Murakami,Fumio Koyama","High Power and High Beam Quality VCSEL Amplifier","2018 International Semiconductor Laser Conference",,,"  WC3",,"pp. 229-230",2018,Sept.
"Takashi Kondo,Junichiro Hayakawa,Naoki Jogan,Akemi Murakami,Jun Sakurai,Xiaodong Gu,FUMIO KOYAMA","Temperature Dependence of Small Signal Response of 850 nm Transverse-Coupled-","25th International Semiconductor Laser Conference, ISLC 2016",,,"  TuD3",,,2016,Sept.
"Naoki Jogan,Junichiro Hayakawa,Takashi Kondo,Akemi Murakami,Jun Sakurai,Xiaodong Gu,FUMIO KOYAMA","Temperature Characteristics of Photo Detector Integrated Transverse-Coupled-Cavity VCSELs","25th International Semiconductor Laser Conference, ISLC 2016",,,"  WE9",,,2016,Sept.