Title

Comparison of higher-order mode suppression and Q-switched laser performance in thulium-doped large mode area and photonic crystal fibers

Authors

Authors

P. Kadwani; C. Jollivet; R. A. Sims; A. Schulzgen; L. Shah;M. Richardson

Comments

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Abbreviated Journal Title

Opt. Express

Keywords

POWER; Optics

Abstract

We report the influence of higher order modes (HOMs) in large mode fibers operation in Q-switched oscillator configurations at similar to 2 mu m wavelength. S-2 measurements confirm guiding of LP11 and LP02 fiber modes in a large mode area (LMA) step-index fiber, whereas a prototype photonic crystal fiber (PCF) provides nearly single-mode performance with a small portion of light in the LP11 mode. The difference in HOM content leads to a significant difference in Q-switched oscillator performance. In the step-index fiber, the percentage of cladding light increases by 20% to >40% with increasing pulse energy to similar to 250 mu J. We accredit this degradation to saturation of the gain in the fundamental mode leading to more light generated in the HOMs, which is eventually converted into cladding light. No such degradation is seen in PCF laser system for >400 mu J energies. (C) 2012 Optical Society of America

Journal Title

Optics Express

Volume

20

Issue/Number

22

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

24295

Last Page

24303

WOS Identifier

WOS:000310443400021

ISSN

1094-4087

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