Heat and temperature distribution in a cladding-pumped, Er

Yb co-doped phosphate fiber

Andrey Kosterin, J. Kevin Erwin, Mahmoud Fallahi, Masud Mansuripur

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

High-gain-per-unit-length, Er: Yb co-doped, phosphate glass fibers are a new class of active photonic materials. Due to their high concentration of active ions (typically 2-6 × 10 20 cm -3), the generation of heat in these materials is rather severe. To facilitate the design of cladding-pumped, high-power lasers and amplifiers using these materials, we introduce two diagnostic techniques for measuring the total heat and the profile of temperature distribution along the length of an active fiber. Thermal experiments on a 6.0-cm-long piece of cladding-pumped phosphate fiber with Er: Yb doping (3:16 wt %) are conducted, and the results are compared with indirect estimates of total heat by scattered light measurements using a power-balance argument. The difference between the two methods is about 8.0%. Even at low pump powers, the temperature of the core (without heat-sinking) is found to be a large fraction of the glass transition temperature. The temperature distribution along the length of the fiber is found to be relatively flat compared with the absorption profile. Our thermal diagnostic tools yield valuable information that can be used to optimize the design of fiber lasers and amplifiers.

Original languageEnglish (US)
Pages (from-to)5166-5172
Number of pages7
JournalReview of Scientific Instruments
Volume75
Issue number12
DOIs
StatePublished - Dec 2004

Fingerprint

phosphates
Phosphates
Temperature distribution
temperature distribution
heat
fibers
Fibers
Enthalpy
amplifiers
Light measurement
sinking
Fiber amplifiers
High power lasers
glass fibers
Fiber lasers
profiles
high gain
Glass fibers
Photonics
high power lasers

ASJC Scopus subject areas

  • Instrumentation
  • Physics and Astronomy (miscellaneous)

Cite this

Heat and temperature distribution in a cladding-pumped, Er : Yb co-doped phosphate fiber. / Kosterin, Andrey; Kevin Erwin, J.; Fallahi, Mahmoud; Mansuripur, Masud.

In: Review of Scientific Instruments, Vol. 75, No. 12, 12.2004, p. 5166-5172.

Research output: Contribution to journalArticle

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