Butterfly Packaged Ultra-Narrow Linewidth Single Frequency Teardrop Laser Diode Yang, Hua ; Yang, Mingqi ; Zhao, Yan ; Zhang, Limeng ; Jia, Zhengkai ; Alexander, Justin ; Zhao, Lingjuan ; Hall, Douglas C. ; Peters, Frank H. Abstract Publication: IEEE Photonics Technology Letters Pub Date: September 2017 DOI: 10.1109/LPT.2017.2722098 Bibcode: 2017IPTL...29.1537Y