Mechanisms in passive synchronization of erbium fiber lasers

Walbaum, Till; Löser, Markus; Groß, P.; Fallnich, Carsten

doi:10.1007/s00340-010-4350-x

Cited by 20 publications

(15 citation statements)

References 24 publications

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“…It is important to note that the transition from the non-synchronised to the synchronised regimes described above did not modify the pulse parameters within experimental accuracy. References [Wei02,Wal11,Rus04b,Fur96] reported that when two lasers were synchronised, a wavelength shift was observed in the slave laser. This has been explained by the asymmetric broadening caused by the XPM effect 6 [Bal88,Fur96].…”

Section: Synchronisation Measurement: Mode-lockingmentioning

confidence: 99%

New materials, regimes and applications of fibre laser techonology

Zhang,

Ferrari,

Obraztsova

et al. 2014

International Photonics and OptoElectronics Meetings

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Nonlinear optics enables the manipulation of spectral and temporal characteristics of optical pulses interacting with a dielectric medium. Optical fibres, as a uniquely practical medium, provide an environment for effectively exploiting the nonlinear effects. This has facilitated the rapid growing interest in this field focused on the investigation of fibrebased sources incorporated with various novel saturable absorber devices for ultrashort pulse generation.This thesis reports a series of experiments exploring the ongoing research in the field of nonlinear optics, including the development of ultrafast mode-locked fibre sources and their applications in supercontinumm generation and third order parametric interactions in new carbon materials.Firstly, the integration of carbon-based materials with rare-earth doped media allows the demonstration of ultrafast mode-locked laser sources operating at wavelengths across the near-infrared region in a compact, low cost and environmentally robust scheme.Power scaling of such sources can be achieved by operating in the all-normal dispersion regime making use of a glass-substrate saturable absorber device that exhibits a higher damage threshold.Supercontinuum generation has been used as an effective method for spectral broadening. Pumping with a conceptually simple and reliable fibre-based system, a continuum covering from 2 to 3 µm is generated in a highly nonlinear GeO 2 fibre. This experiment demonstrates a robust and long-term stable source of radiation in an important band, coincident with a portion of the atmospheric transmission window.Finally, the demonstration of a simple and compact nano-material based dual-wavelength system shows the performance of such devices as a simultaneous saturable absorber and passive synchroniser. An experimental study of coherent frequency mixing at large frequency shifts in a graphene sample, pumped by a two-colour fibre-integrated source, proves the strong nonlinear response of this new carbon material. Woodward who not only provided company inside and outside of the lab, but were also happy to discuss and help all matters of my work and life in UK. In particular, I would like to thank Ed for providing me with much needed support, interesting discussions (especially on food and culture) and continued collaboration since I joined the group. Tim, for making couplers for the Tm-system. Thanks to Tim, Robbie (shared the same office over the past three years!), Ed, and Rob for endless support, spending hours and hours proof reading chapters of this thesis and cheering me up all the time. Thanks to the visitor from A*STAR (Singapore), Dr. Dora Hu (more like a sister), for proof reading and encouraging me to relax during the thesis writing.

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Section: Synchronisation Measurement: Mode-lockingmentioning

confidence: 99%

New materials, regimes and applications of fibre laser techonology

Zhang,

Ferrari,

Obraztsova

et al. 2014

International Photonics and OptoElectronics Meetings

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“…A conversion efficiency of about 50% could be demonstrated experimentally, limited by the damage threshold of the fiber front facet at the used pulse energies. In order to reduce the required pulse energy for the write beam Walbaum et al proposed the use of femtosecond laser pulses for writing and probing the LPG in an extensive numerical study [7]. With femtosecond pulses, peak intensities beyond 100 kW are achievable well below the damage threshold of fiber facets and in a first experimental verification guided mode conversion from the LP 01 -to the LP 11 -mode as well as to the LP 02 -mode * Corresponding author: tim.hellwig@uni-muenster.de by an optically induced LPG could be demonstrated [8] with pulse energies reduced by a factor of 300.…”

Section: Introductionmentioning

confidence: 99%

“…We numerically study guided mode conversion in graded-index fibers by solving the coupled nonlinear Schroedinger equations for each mode [10]. In the first part of the paper (section II) we focus on issue (1): in a scenario similar to the one presented in [7] we study the general difficulties achieving a high conversion efficiency as well as preserving the temporal pulse shape. We specifically address how graded-index fibers allow to reduce the limitations posed by (i) to (iii) when working with ultrashort pulses for mode conversion.…”

Section: Introductionmentioning

confidence: 99%

Optically induced mode conversion in graded-index fibers using ultra-short laser pulses

2013

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We propose the use of graded-index few-mode fibers for mode-conversion by long-period gratings (LPG) transiently written by ultrashort laser pulses using the optical Kerr effect. The mode interaction is studied by numerically solving the multi-mode coupled nonlinear Schrödinger equations. We present highly efficient conversion of the LP01-into the LP11-mode preserving the pulse shape in contrast to previous results in step-index fibers. Furthermore, mode conversion using different wavelengths for inducing and probing the LPG is shown. Due to the flat phase-matching curve of the examined modes in the graded-index fiber, mode-conversion can be observed for probe center wavelengths of 1100 nm up to 1800 nm with a write beam centered around 1030 nm. Therefore, a complete separation of the probe from the write beam should be possible as well as the application of optically induced guided mode conversion for all optical modulation across a broad wavelength range.

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“…Therefore, we relied on an indirect approach by measuring the CEO-frequency difference Δf CEO of another mode-locked erbium laser, as demonstrated in [14]. The measurement principle is depicted in Fig.…”

mentioning

confidence: 99%

“…LD1, laser diode pumping the erbium gain fiber; LD2, laser diode pumping the ytterbium fiber module; RWDM, reflective wavelength division multiplexer; WDM, wavelength division multiplexer; PC, polarization controller; PBS, fiber-coupled polarizing beam splitter. (b) Schematic setup of the slave laser used for relative CEOfrequency measurements (see [14] for details), as well as the measurement setup. SAM, semiconductor saturable absorber mirror; PD, high-speed InGaAs photodiode; RFSA, radiofrequency spectrum analyzer.…”

mentioning

confidence: 99%

Toward an all-optically stabilized frequency comb based on a mode-locked fiber laser

2014

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We present an erbium-doped mode-locked fiber laser comprising two all-optical control mechanisms acting on the carrier envelope offset (CEO)-frequency as well as the repetition frequency. The laser's repetition frequency is stabilized via optically pumping a distinct ytterbium-doped fiber module. By proving that additionally controlling the pump power of the erbium-doped gain fiber acts sufficiently complementary on the laser's CEO-frequency compared with repetition frequency stabilization, we demonstrate the feasibility of this concept for an all-optically controlled frequency comb in an all-fiber setup.

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Mechanisms in passive synchronization of erbium fiber lasers

Cited by 20 publications

References 24 publications

New materials, regimes and applications of fibre laser techonology

New materials, regimes and applications of fibre laser techonology

Optically induced mode conversion in graded-index fibers using ultra-short laser pulses

Toward an all-optically stabilized frequency comb based on a mode-locked fiber laser

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