title: Miniaturized fiber in-line Mach-Zehnder interferometer based on inner air cavity for high-temperature sensing.
abstract: We demonstrate a miniaturized fiber in-line Mach-Zehnder interferometer based on an inner air cavity adjacent to the fiber core for high-temperature sensing. The inner air cavity is fabricated by femtosecond laser micromachining and the fusion splicing technique. Such a device is robust and insensitive to ambient refractive index change, and has high temperature sensitivity of ∼43.2  pm/°C, up to 1000°C, and low cross sensitivity to strain.
authors.forename: T Y
authors.initials: TY
authors.lastname: Hu
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: C R
authors.initials: CR
authors.lastname: Liao
authors.forename: D N
authors.initials: DN
authors.lastname: Wang