TY - JOUR

T1 - Distributed Temperature Monitoring Inside Ytterbium DFB and Holmium Fiber Lasers

AU - Kamynin, Vladimir

AU - Wolf, Alexey

AU - Skvortsov, Mikhail

AU - Filatova, Serafima

AU - Kopyeva, Mariya

AU - Vlasov, Alexandr

AU - Tsvetkov, Vladimir

AU - Babin, Sergey

N1 - Funding Information: Manuscript received March 10, 2021; revised May 27, 2021 and June 29, 2021; accepted July 1, 2021. Date of publication July 7, 2021; date of current version September 18, 2021. This work was supported in part by the Russian Foundation for Basic Research under Grant 18-52-7822, and in part by the Russian Ministry of Science and Higher Education under Grant 14.Y26.31.0017. The authors acknowledge the Multiple-Access Center of the IA&E SB RAS (Novosibirsk, Russia) for providing LUNA OBR 4600. (Corresponding author: Vladimir A. Kamynin.) Vladimir A. Kamynin, Serafima A. Filatova, and Vladimir B. Tsvetkov are with the Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia (e-mail: kamyninva@gmail.com; filsim2910@ gmail.com; tsvetkov@lsk.gpi.ru). Publisher Copyright: © 1983-2012 IEEE.

PY - 2021/9/15

Y1 - 2021/9/15

N2 - A distributed temperature monitoring inside a cavity of ytterbium DFB and holmium fiber lasers has been demonstrated with a spatial resolution of 1 and 5 mm, respectively, for the first time to the best of our knowledge. For this, we use an optical backscatter reflectometer, which measures intracore temperature, and compare it with the data of an IR thermographic camera, which measures temperature from the surface of a fiber. In the case of holmium fiber laser pumped at a wavelength of 1125 nm with a power of 6 W, the maximum temperature variation along the ~3-m active fiber reaches ~60 C. In the case of ytterbium DFB laser, we observe a strong inhomogeneity of the temperature along the DFB cavity, which leads to a significant decrease in the lasing efficiency. When pumped by a single-mode laser diode at a wavelength of 976 nm with a power of up to 526 mW, the maximum temperature difference reaches 37 C for the 37-mm DBF cavity.

AB - A distributed temperature monitoring inside a cavity of ytterbium DFB and holmium fiber lasers has been demonstrated with a spatial resolution of 1 and 5 mm, respectively, for the first time to the best of our knowledge. For this, we use an optical backscatter reflectometer, which measures intracore temperature, and compare it with the data of an IR thermographic camera, which measures temperature from the surface of a fiber. In the case of holmium fiber laser pumped at a wavelength of 1125 nm with a power of 6 W, the maximum temperature variation along the ~3-m active fiber reaches ~60 C. In the case of ytterbium DFB laser, we observe a strong inhomogeneity of the temperature along the DFB cavity, which leads to a significant decrease in the lasing efficiency. When pumped by a single-mode laser diode at a wavelength of 976 nm with a power of up to 526 mW, the maximum temperature difference reaches 37 C for the 37-mm DBF cavity.

KW - distributed feedback

KW - Fiber laser

KW - Fiber lasers

KW - holmium

KW - Measurement by laser beam

KW - optical backscattering reflectometry

KW - Optical fiber sensors

KW - Optical fibers

KW - Pump lasers

KW - Temperature distribution

KW - Temperature measurement

KW - temperature sensing

KW - ytterbium

KW - Distributed feedback

UR - http://www.scopus.com/inward/record.url?scp=85112666935&partnerID=8YFLogxK

U2 - 10.1109/JLT.2021.3095396

DO - 10.1109/JLT.2021.3095396

M3 - Article

AN - SCOPUS:85112666935

VL - 39

SP - 5980

EP - 5987

JO - Journal of Lightwave Technology

JF - Journal of Lightwave Technology

SN - 0733-8724

IS - 18

ER -