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Title: Point-by-point fabrication and characterization of sapphire fiber Bragg gratings

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1399165
Grant/Contract Number:
FE0012274
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Optics Letters
Additional Journal Information:
Journal Volume: 42; Journal Issue: 20; Related Information: CHORUS Timestamp: 2017-10-12 10:56:17; Journal ID: ISSN 0146-9592
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English

Citation Formats

Yang, Shuo, Hu, Di, and Wang, Anbo. Point-by-point fabrication and characterization of sapphire fiber Bragg gratings. United States: N. p., 2017. Web. doi:10.1364/OL.42.004219.
Yang, Shuo, Hu, Di, & Wang, Anbo. Point-by-point fabrication and characterization of sapphire fiber Bragg gratings. United States. doi:10.1364/OL.42.004219.
Yang, Shuo, Hu, Di, and Wang, Anbo. 2017. "Point-by-point fabrication and characterization of sapphire fiber Bragg gratings". United States. doi:10.1364/OL.42.004219.
@article{osti_1399165,
title = {Point-by-point fabrication and characterization of sapphire fiber Bragg gratings},
author = {Yang, Shuo and Hu, Di and Wang, Anbo},
abstractNote = {},
doi = {10.1364/OL.42.004219},
journal = {Optics Letters},
number = 20,
volume = 42,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 13, 2018
Publisher's Accepted Manuscript

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  • We report the use of distributed fiber Bragg gratings to monitor thermal conditions within a simulated nuclear reactor core located at the Early Flight Fission Test Facility of the NASA Marshall Space Flight Center. Distributed fiber-optic temperature measurements promise to add significant capability and advance the state-of-the-art in high-temperature sensing. For the work reported herein, seven probes were constructed with ten sensors each for a total of 70 sensor locations throughout the core. These discrete temperature sensors were monitored over a nine hour period while the test article was heated to over 700 deg. C and cooled to ambient throughmore » two operational cycles. The sensor density available permits a significantly elevated understanding of thermal effects within the simulated reactor. Fiber-optic sensor performance is shown to compare very favorably with co-located thermocouples where such co-location was feasible.« less
  • The technique presented here allows us to obtain an accurate determination of the refractive index modulation amplitude, the mean effective index, and the chirp of fiber-Bragg gratings. A layer-peeling algorithm is used to extract this information from low-coherence interferometry measurements. Finally, we present a systematic study over 10 uniform and chirped gratings to proof the reliability and accuracy of this technique.
  • Chirped fiber Bragg gratings control the pulse width and energy in Kerr mode-locked erbium fiber soliton lasers. We create high-energy pulses by providing large amounts of excessive negative dispersion, which increases the pulse width while keeping the nonlinearity of the cavity constant. With a chirped fiber grating of 3.4-ps{sup 2} dispersion, 3-ps pulses with an energy content higher than 1 nJ are generated at a repetition rate of 27 MHz. By controlling the polarization state in the cavity, we obtain a tuning range from 1.550 to 1.562 {mu}m.
  • Environmentally stable high-power erbium fiber soliton lasers are constructed by Kerr or carrier-type mode locking. We obtain high-energy pulses by using relatively short fiber lengths and providing large amounts of negative dispersion with chirped fiber Bragg gratings. The pulse energies and widths generated with both types of soliton laser are found to scale with the square root of the cavity dispersion. Kerr mode locking requires pulses with an approximately three times higher nonlinear phase shift in the cavity than carrier mode locking, which leads to the generation of slightly shorter pulses with as much as seven times higher pulse energiesmore » at the mode-locking threshold. {copyright} {ital 1995} {ital Optical} {ital Society} {ital of} {ital America}.« less