Multimode Fiber Beam Self-Cleaning in the Anomalous Dispersion Regime
Yann LeventouxAlexandre ParriauxG. GrangerMathieu JossentLaure LavouteDmitry GaponovMarc FabertAlessandro TonelloKatarzyna KrupaAgnès Desfarges‐BerthelemotVincent KermèneOleg SidelnikovG. MillotSébastien FévrierS. WabnitzVincent Couderc
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Abstract:
We experimentally demonstrate Kerr beam self-cleaning of picosecond pulses in the anomalous dispersion regime of graded-index multimode optical fibers, with threshold power reduced by two orders of magnitude with respect to the normal dispersion regime. © 2019 The Author(s)Keywords:
Self-focusing
Picosecond
Modal dispersion
Zero-dispersion wavelength
We demonstrate, to the best of our knowledge, the first spatiotemporally mode-locked dispersion-managed fiber laser. The fiber oscillator, which includes a 250 modes multimode fiber section, generates 20 nJ pulses centered at 1034 nm with 730 mW average power, 3.88 ps pulse duration and a Gaussian beam near single mode output profile. The output pulses are compressed to ~97 fs via an external grating compressor.
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We report and compare three configurations of the semiconductor saturable absorber mirror mode-locked, linear cavity femtosecond all-fiber master oscillator power amplifier based on a highly Ge-doped thulium-doped normal dispersion fibers. We have studied the performance of the system and have obtained stable mode-locking in a wide cavity dispersion range ~1.88 μm. In this letter, we focus our attention on three mode-locking regimes: laser operating in the anomalous, nearly zero and normal cavity dispersion regimes without the use of the additional dispersion compensating elements. For the nearly zero and normal cavity dispersion regimes the femtosecond pulses with several nanojoule energy could be obtained. The pulses were further compressed down to 630 fs using a simple fiber compressor consisting of a piece of the conventional telecommunication fiber, making the laser design particularly simple and cost effective.
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Passively mode-locked ultrafast ytterbium fiber lasers operating in the wavelength range around 1 mum are subject of intensive investigations during the past years owing to their great potential of realizing cost-effective and compact set-ups [1]. Particularly all-fiber based laser systems are highly suited for the development of reliable, alignment free and low noise laser sources [2]. In this contribution, we will report on two different approaches of providing those ultrafast fiber lasers. A first one is based on a dispersion managed cavity by using a higherorder-mode fiber (HOMF) [3] and the second one consists of an all-normal dispersion fiber oscillator applying spectral filtering for pulse stabilization [4].
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We describe a beam cleanup setup to convert a multimode beam into a singlemode beam by stimulated-Brillouin-scattering in a multimode gradient-index fiber. A M 2 =6.5 beam is converted into a M 2 =1.3 beam with 31% efficiency.
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In this work we report on a complete analysis of the fundamental mode beam delivery in highly multimode step-index fibers, at a fixed NA of 0.111 for various core diameters consisting of a pure silica core and a fluorine doped cladding. The most crucial parameter for a successful propagation of the fundamental mode is a pure fundamental mode excitation in the beginning. The mode field of the launched beam has to be adapted to the fundamental LP 01 -mode of the fiber, which was analyzed experimentally and theoretically.
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We demonstrate Kerr self-cleaning of beams in an Ytterbium doped multimode fiber taper with exponentially decreasing nonlinearity, with no accompanying frequency conversion or spectral broadening.
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We experimentally demonstrate a passively mode-locked all-fiber Tm laser with an all-fiber saturable absorber (SA) which operates based on the nonlinear multimode interference (NL-MMI) effect in a tapered graded-index multimode fiber (GIMF). The tapered GIMF SA demonstrates the nonlinear characteristics of modulation depth of 21.15%, and saturation fluence of $89.04~\mu \text{J}$ /cm 2 . We obtain stable fundamentally mode-locking operation at a pump threshold of 120 mW. The output soliton pulses have a center wavelength, spectral width, pulse duration and repetition rate of 1935 nm, 2.1 nm, 1.9 ps and 18.79 MHz, respectively. This is a simple, low-cost, stable, and convenient laser oscillator with many potential applications in eye-safe ultrafast photonics.
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We experimentally demonstrate polarization-dependent Kerr spatial beam self-cleaning into the LP11 mode of an Ytterbium-doped multimode optical fiber with parabolic gain and refractive index profiles. © 2019 The Author(s)
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