This article is cited in 3 papers

Laser optics 2012

Second-harmonic generation efficiency for multifrequency ytterbium-doped fibre laser radiation

M. O. Politko^ab, S. I. Kablukov^b, I. N. Nemov^b, S. A. Babin<sup>ab

a</sup> Novosibirsk State University
^b Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk

Abstract: The second-harmonic generation (SHG) efficiency for cw Yb-doped fibre laser radiation, which is characterised by many longitudinal modes with random phases, is compared with the SHG efficiency for amplified single-frequency Nd : YAG laser radiation in ppLN and KTP crystals, characterised by the type-I and type-IIphase matching, respectively. It is shown that the conversion efficiency into the second harmonic in the multifrequency regime for both crystals is higher by a factor of about 1.6, a value close to the calculated enhancement (2 for the Gaussian mode statistics). This difference is explained by possible deviation of the statistics of the Yb-doped fibre laser radiation from Gaussian, which is confirmed by measurements of the laser temporal dynamics.

Keywords: fibre laser, second-harmonic generation, crystal, KTP, ppLN, efficiency, multifrequency regime, single-frequency regime, Gaussian statistics.

PACS: 42.55.Wd, 42.60.Lh, 42.65.Ky

Received: 24.10.2012
Revised: 15.11.2012

 English version: Quantum Electronics, 2013, 43:2, 99–102

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