Abstract
We have successfully fabricated a series of sampled fiber Bragg gratings with easily adjustable sampling periods and duty cycles using an 800 nm femtosecond laser point-by-point inscription. The thermal stability of the fabricated fiber gratings was investigated using isochronal annealing tests, which indicated that the fiber gratings are capable of maintaining high reflectivity at temperatures of up to 1000°C for 8 h. This demonstrates the potential of the developed sampled fiber Bragg gratings for use in multi-wavelength fiber lasers and a variety of high temperature applications.
Highlights
Sampled fiber Bragg gratings (SFBGs) have attracted recent interest owing to their wide use in a variety of applications such as dense wavelength-division-multiplexed (DWDM) systems [1], fiber-optic sensors [2,3], and multi-wavelength fiber lasers [4,5]
SFBGs fabricated by PBP inscription were firstly reported by Marshall et al [12], and the PBP inscription method has demonstrated a remarkable facility for fabricating SFBGs as well as many other types of gratings with customized grating periods, amplitudes, and phases according to specific customer requirements [12,13,14,15]
A schematic diagram of the fs-laser PBP inscription system employed in the present study is shown in Fig. 1(a), which utilizes a regenerative amplified and low repetition rate Solstice® Ti:sapphire fs laser (Spectra-Physics®, Newport Corp.) with 100 fs pulses, a central wavelength of 800 nm, and a repetition rate of 1 kHz to produce fiber gratings
Summary
Sampled fiber Bragg gratings (SFBGs) have attracted recent interest owing to their wide use in a variety of applications such as dense wavelength-division-multiplexed (DWDM) systems [1], fiber-optic sensors [2,3], and multi-wavelength fiber lasers [4,5]. Fang et al demonstrated SFBG fabrication by heating a uniform fiber Bragg grating (FBG) inscribed by a femtosecond laser [9] This method has an optional modulation envelop, but the thermal stability of the resulting SFBGs is limited by the heating process. Point-by-point (PBP) inscription of FBGs offers a remarkable technological flexibility, and the resulting gratings demonstrate good high-temperature stability [10,11]. This fabrication method eliminates the requirement of a phase mask, and the grating parameters can be altered by adjusting fiber motion. The resulting SFBGs exhibit remarkable thermal stability at high temperatures of up to 1000°C, which represents a significant improvement relative to SFBGs inscribed by means of an excimer laser [2,8]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
