title: External cavity diode laser with kilohertz linewidth by a monolithic folded Fabry-Perot cavity optical feedback.
abstract: We present a extended-cavity diode laser (ECDL) with kilohertz linewidth by optical feedback from a monolithic folded Fabry-Perot cavity (MFC). In our experiments, an MFC replaces the retroreflecting mirror in the traditional ECDL configuration. Beat-note measurements between this MFC-ECDL and a narrow-linewidth reference laser are performed and demonstrate that the linewidth of this MFC-ECDL is about 6.8 kHz. Phase locking of this MFC-ECDL to the reference laser is achieved with a unity gain as small as 10.2 kHz.
authors.affiliation: Division of Electricity and Quantum Metrology, National Institute of Metrology, 18 Beisanhuan East Road, Beijing, 100013, China. zhaoyang@nim.ac.cn
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhao
authors.forename: Yu
authors.initials: Y
authors.lastname: Peng
authors.forename: Tao
authors.initials: T
authors.lastname: Yang
authors.forename: Ye
authors.initials: Y
authors.lastname: Li
authors.forename: Qiang
authors.initials: Q
authors.lastname: Wang
authors.forename: Fei
authors.initials: F
authors.lastname: Meng
authors.forename: Jianping
authors.initials: J
authors.lastname: Cao
authors.forename: Zhanjun
authors.initials: Z
authors.lastname: Fang
authors.forename: Tianchu
authors.initials: T
authors.lastname: Li
authors.forename: Erjun
authors.initials: E
authors.lastname: Zang