High-efficiency CW all-fiber parametric oscillator tunable in 0.92-1 μm range Ekaterina A. Zlobina,1,* Sergey I. Kablukov,1 and Sergey A. Babin 1,2 1

Institute of Automation and Electrometry, Siberian Branch of the Russian Academy of Sciences, 1 Ac. Koptyug ave., Novosibirsk, 630090, Russia 2 Novosibirsk State University, 2 Pirogova str., Novosibirsk, 630090, Russia * [email protected]

Abstract: Continuous tuning over 80 nm is demonstrated for the antiStokes wave generated in an optical parametric oscillator (OPO) based on a birefringent photonic crystal fiber pumped by a CW Ytterbium-doped fiber laser tuned around 1.05 μm (within 4 nm only). An influence of the pump laser linewidth and polarization state on the fiber OPO threshold and efficiency is studied. Slope efficiency of parametric generation at 931 nm reaches 19% for ~0.1 nm linearly polarized pump with threshold power of ~5W. At that, the generated linewidth amounts to about 1 nm. ©2015 Optical Society of America OCIS codes: (060.2320) Fiber optics amplifiers and oscillators; (060.5295) Photonic crystal fibers; (140.3510) Lasers, fiber; (190.4380) Nonlinear optics, four-wave mixing.

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Received 27 Oct 2014; revised 4 Dec 2014; accepted 10 Dec 2014; published 13 Jan 2015 26 Jan 2015 | Vol. 23, No. 2 | DOI:10.1364/OE.23.000833 | OPTICS EXPRESS 833

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1. Introduction Fiber optical parametric oscillators (FOPOs) based on four-wave mixing (FWM) in photonic crystal fibers (PCFs) enable high-efficiency generation of tunable radiation with large frequency shifts. Such laser sources are very attractive for applications in nonlinear microscopy [1]. Recent advances in pulsed fiber lasers lead to development of versatile tools for real-time label-free imaging of living tissues [2]. For example, high-efficiency FOPO for coherent anti-Stokes Raman scattering (CARS) microscopy has been demonstrated recently [3]. At the same time tunable CW FOPOs can be potentially applied in optical coherence tomography [4] and coherent Raman scattering microscopy [5]. However, their output parameters are usually not sufficient: anti-Stokes powers are

High-efficiency CW all-fiber parametric oscillator tunable in 0.92-1 μm range.

Continuous tuning over 80 nm is demonstrated for the anti-Stokes wave generated in an optical parametric oscillator (OPO) based on a birefringent phot...
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