title: Thermally triggered fiber lasers based on secondary-type-In Bragg gratings.
abstract: The secondary-type-In grating formed in a small-core photosensitivity active fiber is discovered and investigated. Due to the different grating types, the transmission dip of a secondary grating structure chases and integrates with the type-In grating structure as the temperature increases, which strengthens the reflectivity of the grating. By use of these secondary-type-In gratings as Bragg reflectors, a thermally activated distributed Bragg reflector (DBR) fiber laser is proposed, which can be potentially used in high-temperature alarms and sensors.
authors.forename: Fu-Rong
authors.initials: FR
authors.lastname: Feng
authors.forename: Yang
authors.initials: Y
authors.lastname: Ran
authors.forename: Yi-Zhi
authors.initials: YZ
authors.lastname: Liang
authors.forename: Shuai
authors.initials: S
authors.lastname: Gao
authors.forename: Yuan-Hua
authors.initials: YH
authors.lastname: Feng
authors.forename: Long
authors.initials: L
authors.lastname: Jin
authors.forename: Bai-Ou
authors.initials: BO
authors.lastname: Guan