Q-switching and efficient harmonic generation from a single-mode LMA photonic bandgap rod fiber laser

Laurila, Marko; Saby, Julien; Alkeskjold, Thomas Tanggaard; Scolari, Lara; Cocquelin, Benjamin; Salin, F.; Broeng, Jes; Lægsgaard, Jesper

doi:10.1364/oe.19.010824

Cited by 34 publications

(26 citation statements)

References 9 publications

(15 reference statements)

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“…This paper focuses on the FM and the first HOM to determine SM properties [7]. Previous experimental studies have shown SM properties of the DMF rod fiber within the spectral region, where the first HOM, resembling the first asymmetric LP 11 -like HOM, couples with the resonators [12,13]. This supports the argument that the first HOM is the limiting factor, also stated in [7].…”

Section: Distributed Modal Filtering Rod Fibersupporting

confidence: 69%

“…The distributed modal filtering (DMF) rod fiber utilizes resonators in the inner cladding structure to enable SM guidance over a certain spectral range despite the very LMA and ultra low NA [12]. High index resonators in a low index cladding function as modal filters filtering HOMs out of the core into the cladding [12,13]. This enables very LMA fibers that maintain SM guidance over a certain spectral range, and has good beam quality and pointing stability in a fiber amplifier configuration.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Optimizing single mode robustness of the distributed modal filtering rod fiber amplifier

Jørgensen¹,

Petersen²,

Laurila³

et al. 2012

Opt. Express

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High-power fiber amplifiers for pulsed applications require large mode area (LMA) fibers having high pump absorption and near diffraction limited output. Photonic crystal fibers allow realization of short LMA fiber amplifiers having high pump absorption through a pump cladding that is decoupled from the outer fiber diameter. However, achieving ultra low NA for single mode (SM) guidance is challenging, thus different design strategies must be applied. The distributed modal filtering (DMF) design enables SM guidance in ultra low NA fibers with very large cores, where large preform tolerances can be compensated during the fiber draw. Design optimization of the SM bandwidth of the DMF rod fiber is presented. Analysis of band gap properties results in a fourfold increase of the SM bandwidth compared to previous results, achieved by utilizing the first band of cladding modes, which can cover a large fraction of the Yb emission band including wavelengths of 1030 nm and 1064 nm. Design parameters tolerating refractive index fabrication uncertainties of ± 10 −4 are targeted to yield stable SM bandwidths. C. Jakobsen, "Low-nonlinearity single-transverse-mode ytterbium-doped photonic crystal fiber amplifier," Opt. ©2012 Optical Society of America

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Section: Distributed Modal Filtering Rod Fibersupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Optimizing single mode robustness of the distributed modal filtering rod fiber amplifier

Jørgensen¹,

Petersen²,

Laurila³

et al. 2012

Opt. Express

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“…Outside the resonant coupling regime, the fiber appears either MM or does not guide light in the core. A detailed description of the guiding properties and analysis of the DMF rod fibers has been presented in Refs [6,8,9,24]. Here, we demonstrate and experimentally confirm, for the first time to the best of our knowledge, that resonant mode coupling is the primary mechanism by which these fibers provide SM guidance within specific wavelength ranges and demonstrate the feasibility of the C 2 imaging method for short-length and very large mode area fibers.…”

Section: Introductionsupporting

confidence: 66%

“…High level output power in these systems is achieved by increasing the effective modal area of fiber-optic elements while simultaneously maintaining diffraction-limited operation [2][3][4][5][6]. Various fiber designs have been proposed and tested [7][8][9][10][11][12], yielding extremely high pulse energies and peak powers [11,13], in which the single-mode operation of the core region is preserved. Alternatively, very large effective mode areas can be achieved using higher-order mode amplification [7,14,15].…”

Section: Introductionmentioning

confidence: 99%

Cross-correlated imaging of single-mode photonic crystal rod fiber with distributed mode filtering

Laurila¹,

Barankov²,

Jørgensen³

et al. 2013

Opt. Express

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(2013). Cross-correlated imaging of single-mode photonic crystal rod fiber with distributed mode filtering. Optics Express, 21(8) Abstract: Photonic crystal bandgap fibers employing distributed mode filtering design provide near diffraction-limited light outputs, a critical property of fiber-based high-power lasers. Microstructure of the fibers is tailored to achieve single-mode operation at specific wavelength by resonant mode coupling of higher-order modes. We analyze the modal regimes of the fibers having a mode field diameter of 60 µm by the crosscorrelated (C 2 ) imaging method in different wavelength ranges and evaluate the sensitivity of the modal content to various input-coupling conditions. As a result, we experimentally identify regimes of resonant coupling between higher-order core modes and cladding band. We demonstrate a passive fiber design in which the higher-order modal content inside the single-mode guiding regime is suppressed by at least 20 dB even for significantly misaligned input-coupling configurations.

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“…Below 1050nm, the FM couples to the DMF elements and becomes leaky (leaky regime).The pump absorption is ~27dB/m@976nm, which gives an effective amplifier length of 70-90cm depending on configuration. Figure 1b shows the slope efficiency of a 70cm rod amplifier in a wavelength-locked Q-switched laser configuration [10]. The rod delivers 14ns pulses with up to 2mJ pulse energy and 0.4nm spectral width in a diffraction limited output with M 2 <1.2.…”

Section: Single-mode Rod Pcf Amplifiersmentioning

confidence: 99%

Advances in Solid Core Photonic Bandgap Fiber Amplifiers

Alkeskjold¹,

Laurila

Petersen

et al. 2012

Optical Fiber Communication Conference

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Q-switching and efficient harmonic generation from a single-mode LMA photonic bandgap rod fiber laser

Cited by 34 publications

References 9 publications

Optimizing single mode robustness of the distributed modal filtering rod fiber amplifier

Optimizing single mode robustness of the distributed modal filtering rod fiber amplifier

Cross-correlated imaging of single-mode photonic crystal rod fiber with distributed mode filtering

Advances in Solid Core Photonic Bandgap Fiber Amplifiers

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