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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 24295–24303

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

Pankaj Kadwani, Clemence Jollivet, R. Andrew Sims, Axel Schülzgen, Lawrence Shah, and Martin Richardson  »View Author Affiliations

Optics Express, Vol. 20, Issue 22, pp. 24295-24303 (2012)

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We report the influence of higher order modes (HOMs) in large mode fibers operation in Q-switched oscillator configurations at ~2 μm wavelength. S2 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 ~250 µJ. 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 µJ energies.

© 2012 OSA

OCIS Codes
(060.2420) Fiber optics and optical communications : Fibers, polarization-maintaining
(140.3540) Lasers and laser optics : Lasers, Q-switched
(060.5295) Fiber optics and optical communications : Photonic crystal fibers
(060.3510) Fiber optics and optical communications : Lasers, fiber

ToC Category:
Fiber Optics and Optical Communications

Original Manuscript: August 7, 2012
Revised Manuscript: September 29, 2012
Manuscript Accepted: October 1, 2012
Published: October 9, 2012

Pankaj Kadwani, Clemence Jollivet, R. Andrew Sims, Axel Schülzgen, Lawrence Shah, and Martin Richardson, "Comparison of higher-order mode suppression and Q-switched laser performance in thulium-doped large mode area and photonic crystal fibers," Opt. Express 20, 24295-24303 (2012)

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