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This paper presents the concept and design of medium to high power fiber radiation sources in MOPA (Master Oscillator Power Amplifier) configuration. Research results are presented on a two-stage power amplifier for MOPA applications for the third telecommuni-cations window at 1550 nm based on active erbium-doped and erbium/ytterbium-doped fibers....
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Two types of tubular dielectric elastomers (DE) torsional actuators are studied in this work, which are respectively reinforced by a family and two families of helical inextensible fibers. When subject to a radial electric field, torsional deformation will be induced in the DE actuators due to the constraint of inextensible fibers. By conducting fi...
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... As shown in Fig. 5(b), the 20-dB Lorentzian fitted linewidth of the heterodyne signal was 1.62 MHz, and the corresponding laser linewidth was 81 kHz in full width at half-maximum. It was relatively broad because of the relatively high cavity loss, but it was suitable to be as a seed for the MOPA to achieve a high-power single-frequency output [30,31]. ...
A linearly polarized low-noise single-frequency fiber laser was demonstrated by using a homemade 1.2-cm-long Yb:YAG crystal derived silica fiber. A maximum output power of greater than 60 mW was obtained with a signal-to-noise ratio of ${\sim}{80}\;{\rm dB}$ ∼ 80 d B and a polarization extinction ratio of 27.8 dB. Additionally, the relative intensity noise was measured to be ${-}{145}\;{{\rm dB}/{\rm Hz}}$ − 145 d B / H z above 6.5 MHz. A frequency fluctuation of less than 20 MHz was also obtained. The output power was scaled up to 14.5 W with a one-stage all-fiber amplifier scheme with a slope efficiency of 56.4%.
... Temporarily broadened pulses are afterwards amplified in a fiber amplifier, which comprises the same TDF type as the oscillator (30 cm length). The active fiber is bi-directionally pumped at 1566 nm wavelength using a laser diode amplified in a self-made Erbium-Ytterbium co-doped fiber amplifier [20] (with maximum available power of 2.46 W) via filter-type WDMs (FWDM), which reflect the pump light. After amplification, the pulses are compressed in a 20.4 meter long segment of standard single-mode fiber (SMF) with GDD of 0.083 ps 2 /m at 2000 nm [15]. ...
We report on generation of 260 fs-short pulses with energy of 1.1 nJ from a fully fiberized, monolithic Tm-doped fiber laser system. The design comprises a simple, graphene-based ultrafast oscillator and an integrated all-fiber chirped pulse amplifier (CPA). The system generates 110 mW of average power at 100.25 MHz repetition rate and central wavelength of 1968 nm. This is, to our knowledge, the highest pulse energy generated from a fully fiberized sub-300 fs Tm-doped laser, without the necessity of using grating-based dispersion compensation. Such compact, robust and cost-effective system might serve as a seed source for nonlinear frequency conversion or mid-infrared supercontinuum generation.
... Introduced in recent years double-clad multicore optical fibres offer new possibilities in the area of high-power short-length fibre lasers design [1][2][3][4][5][6]. In these fibres, the number of doping rare earth element ions is greater than in typical singlecore fibres, proportionally to the number of cores. ...
... In the considered situation, however, the intensity of the beam generated in the far-field is relatively low. The simulations of far-field pattern for the 19-core fibre generating mutually coherent radiation is shown in the following figures (Figs. [3][4][5]. ...
The supermode generation in a multicore optical fibre laser can be realised by phase-locking of radiation inside of the fibre. The model proposed by authors implies the achievement of supermode generation by exchanging radiation between the cores during the development of the laser action. The analysis of the impact of coupling value between the cores on phase radiation of particular emitters was considered. In the paper the phase-locking of 19-core optical fibre doped with Yb3+ ions is presented. The analysis of material and geometrical parameters of the active 19-core optical fibre and phase deviation on the beam quality factor of the laser beam in the far-field diffraction region has been analysed. The beam quality factor of the manufactured multicore fibre equals BQF = 0.71, V = 2.4, d = 18 mu m. As a result of the conducted analysis a double-clad 19 - cores optical fibre doped with ytterbium ions has been designed and fabricated and its luminescence spectra and far-field diffraction pattern have been measured. Registered in the experiment in MOFPA system far-field pattern showed centrally located peak of relatively high radiation intensity together with smaller side-lobes, and as such was similar to the pattern which had been obtained numerically.
The interaction distance for relativistic electrons and optical radiation in a mode-locked free-electron laser is often limited by the electron bunch length. For a far-infrared oscillator, it is indicated that the round-trip gain and thus the output coupling efficiency can be increased by the introduction of an intracavity filter composed of four metal meshes.
In this paper we present a fiber-based coherent light
source operating at 1550nm wavelength and 5W of the output power. It
utilizes the Master Oscillator Power Amplifier scheme of operation.
This allowed to get a universal design which can work in a couple of
different operation regimes: CW, pulsed and wideband ASE generation.
The all-in-fiber construction makes it compact and environmental
conditions resistant.
In this paper we present a device - fiber based coherent light source
operating at 1550 nm wavelength and 5 W of the output power. It is made
completely of the fiber elements without any bulk optics therefore it is
stable and resistant to the environmental conditions. The main idea was
to use so called MOPA (Master Oscillator Power Amplifier) configuration
to obtain universal design. Thus the device can be easily configured to
work in couple different operation regimes.
A new design of an erbium-ytterbium doped fiber amplifier is
demonstrated. The amplifier contains a wavelength-tuned loop resonator
for the 1 μm signal. The amplified spontaneous emission (ASE) from Yb
ions is used to stimulate a laser emission at several wavelengths from
the 1 μm band in the 1550 nm amplifier. The wavelength of this lasing
is selected by introducing a spectral filter. The results show, that the
efficiency of the amplifier at nominal 1550 nm wavelength can be
increased by introducing a feedback loop with 1040 nm and 1050 nm
filters. This loop also protects the Er-Yb amplifier from parasitic
lasing and allows output power scaling without risk of self-pulsing at 1
μm.
In this work we present a high-power laser source developed in Master
Oscillator Power Amplifier (MOPA) configuration. Presented MOPA source
consists of three amplifying stages: pre-amplifier based on erbium-doped
fiber, medium-power stage based on double-clad Er/Yb co-doped fiber and
the power stage, based on Er/Yb co-doped doubleclad LMA fiber. Whole
system is set up in All-In-Fiber technique, without any bulk, free-space
optical elements. It provides over 20W of output power in the eye-safe
1550 nm band.
An all-fiber 10.9 W single-frequency one-stage linearly-polarized master-oscillator power amplifier (MOPA) laser at 1560 nm has been demonstrated. The laser linewidth is less than 3.5 kHz and the polarization-extinction ratio (PER) is greater than 24 dB. The measured signal-to-noise ratio (SNR) is higher than 70 dB and the optical-to-optical conversion efficiency is 29.5%. No obvious stimulated Brillouin scattering and the devastating effects of unwanted coupling light were observed.
