A turnkey fiber laser source generating high-quality pulses with a spectral sech shape and Fourier transform-limited duration of order 100 fs widely tunable in the 1.6-2.65 μm range is presented. It based on Raman soliton self-frequency shifting suspended-core microstructured TeO2-WO3-La2O3 glass pumped by hybrid Er/Tm system. Detailed experimental theoretical studies, which are very good agreement, nonlinear pulse dynamics tellurite carefully measured calculated parameters reported....

We demonstrate a novel amplification regime in counter-pumped, relatively long (2 meters), large mode area, highly Yb-doped and polarization-maintaining tapered fiber, which offers high peak power directly from the amplifier. The main feature of this is that amplifying signal propagates through thin part fiber without experiences an extremely gain thick where most pump absorbed. In regime, we have demonstrated 8 ps pulse to up 0.76 MW, limited by appearance stimulated Raman scattering. same...

Ultrabroadband amplification and two-color CW lasing simultaneously near 1.9 μm 2.3 in a Tm3+-doped tellurite fiber were demonstrated experimentally, for the first time to best of our knowledge. A low-loss core from TeO2-ZnO-La2O3-Na2O glasses stable against crystallization was produced by special technique, providing low concentration hydroxyl groups. Supercontinuum highly GeO2 doped silica pumped an Er laser system used as seed amplifier. maximum gain 30 dB 7 measured at μm, respectively....

Femtosecond pulses with broad tunability in the range of 2-3 μm are generated a germanate-glass core silica-glass cladding fiber driving pulse at 2 produced by an all-fiber laser system consisting Er:fiber source 1.6 μm, Raman shifter, and Tm:fiber amplifier. We demonstrate optical duration order 100 fs that shortest ones reported 2.5-3 obtained systems.

We report generation of femtosecond optical pulses tunable in the 1.6-2.5 μm range using GeO2-doped core silica-cladding fibers. Optical solitons with a duration 80-160 fs have been measured by FROG technique 2-2.3 range. To best our knowledge, these are longest wavelength temporally characterized generated silica-based also demonstrated more than octave-spanning supercontinuum 1.0-2.6

We report a new ytterbium-doped active tapered fibre used in the output amplifier stage of laser system for generation megawatt peak power ultrashort pulses microjoule energy range. The is single-mode at its input end (core and cladding diameters 10 ) multimode (diameters 45 ), but are amplified quasi-single-mode regime. Using hybrid Er/Yb comprising an erbium master oscillator wavelength near , nonlinear converter to range three-stage amplifier, we obtained duration, which were then...

This Letter reports the experimental realization, for first time to our knowledge, of lasing in an erbium-doped tellurite fiber at 2.72 µm. The key successful implementation was use advanced technology obtaining ultra-dry preforms glasses, as well creation single-mode Er3+-doped tungsten-tellurite fibers with almost imperceptible absorption band hydroxyl groups, a maximum ∼3 linewidth output spectrum narrow 1 nm. Our experiments also confirm possibility pumping Er-doped low-cost high...

A method of producing high quality, optically synchronized two-color ultrashort pulses in an active thulium-doped fiber is proposed. We show that sech-shaped femtosecond with essentially different wavelengths can be generated directly from a Tm/Yb-co-doped amplifier: one pulse at about 2 μm and the second tunable wavelength up to 2.3 μm, which covers pump gain regions Cr:ZnSe Cr:ZnS amplifiers. The shortest durations 145 fs 2.25 125 were measured by FROG (frequency-resolved optical gating) technique.

A detailed study of supercontinuum (SC) generation in germano-silicate fibers with a femtosecond silica-based all-fiber laser system is performed. We report on more than octave spanning SC the range 1-2.6 μm pumped at 1.6 as well 1.9-3 2 μm. It also shown theoretically that optimal fiber parameters, extending beyond 3 can be produced effectively.

We have demonstrated a femtosecond erbium-doped fibre laser system built in the master oscillator/power amplifier (MOPA) approach. The final stage utilises specially designed large mode area active cladding-pumped by multimode diodes. is capable of generating submicrojoule pulses at wavelength near . obtained with an energy output can be converted to wavelengths shorter than through generation dispersive waves passive nonlinear fibre. ultra-short spectral width and centre , which used as...

Nonlinear spatiotemporal dynamics of femtosecond pulses in a hexagonal seven-core silica fiber pumped by sub-μJ 370 fs Er:fiber chirped pulse amplification (CPA) system were studied. shaping and compression the central core pedestal coupling to outer cores directly measured frequency-resolved optical gating. Further spectrally broadened multicore down 53 was demonstrated. Two orders magnitude contrast enhancement after observed.

Erbium-doped high purity zinc-tellurite fiber lasers operating at 2.7– <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$2.8~\mu \text{m}$ </tex-math></inline-formula> were demonstrated by pumping in the 980 nm Er3+ absorption band. To best of our knowledge, a maximum pulse energy notation="LaTeX">$500~\mu \text{J}$ over notation="LaTeX">$\sim 100~\mu \text{s}$ duration with slope efficiency 5 % was achieved...

We report a simple fiber-implemented technique for complete reconstruction of intensity profile and phase ultrashort laser pulses based on processing only pulse spectrum two self-phase modulated spectra measured after short piece optical fiber. Its applicability is shown an example fiber system in the telecommunication range. A retrieval algorithm dispersionless approximation with considering dispersion effects developed. The obtained results are confirmed by independent measurements using...

Abstract We consider a fibre laser system generating ∼10-μJ, ∼500-fs pulses with peak power of ∼10 MW at repetition rate 100 kHz and emission wavelength 1.56 μm. The is based on master oscillator – amplifier configuration. ensures chirped-pulse amplification. are then compressed by dispersive grating compressor. output stage specially designed tapered large mode area erbium-doped for suppressing nonlinear effects. experimental data agree numerical simulation results the stretcher, stretcher...

In this paper, we provide a new experimental insight into the lasing process in erbium-doped tellurite glass fiber at high diode-pump powers and pumping pulse durations. It is shown that occurs two wavelengths. Initially, fixed wavelength of 2.718 µm corresponding to luminescence maximum, takes place during first ∼100 µs from start pump pulse, while main laser power 2.8 for rest shifts longer wavelengths with increasing power. At durations essentially exceeding lifetime upper level, no...

We report novel functionalities of a very simple, robust, and low-cost optical metrology method for the reconstruction an intensity profile phase pulses in telecommunication range based on measuring fundamental spectrum two self-phase modulated spectra after nonlinear element with Kerr nonlinearity. demonstrate, first time, to best our knowledge, possibility implementing this using microstructured tellurite fiber (with zero dispersion wavelength 1.55 μm coefficient >500 (W km) <sup...

We propose two-color pump schemes for CW Er-doped tellurite fiber lasers and amplifiers in the 2.7–2.8 µm range at transition. The use of first wavelength 0.98 () or 1.56 second 1.7 allows obtaining gain relatively low powers. have performed a theoretical study laser operation under on basis experimentally measured parameters specially prepared from TeO2–ZnO–La2O3–Na2O glass. It has been shown numerically that, an optimal length, small-signal may exceed 18 dB generation be achieved with...

We have investigated a new fibre laser configuration for the generation of ultrashort pulses at repetition rate far exceeding fundamental cavity frequency. The includes nonlinear amplifying mirror as an artificial saturable absorber mode locking and spectral comb filter pulse separation stabilisation. Generation trains sequences tunable in range 8 – 200 GHz has been demonstrated experimentally. generated by shown to retain ordered, equidistant structure on nanosecond timescale.

This paper presents an experimental study of broadband mid-IR amplification that is carried out, for the first time, to best our knowledge, in erbium-doped tungsten tellurite fiber. A simple, robust supercontinuum source based on a tapered germanate fiber developed as seed input region 1.5-3 µm. We show gain by factor 5 one pass can be achieved 2.7 µm range pumping low-cost, high-efficiency diode laser at 976 nm using high-purity glass fibers.

We proposed and investigated a novel tapered ytterbium-doped fiber design. The has length of 2.1 m, single-mode thin end thick with core/clad diameter about 50/430 µm. Master-oscillator power-amplifier monolithic scheme have been developed using this 5 ps duration, 28 nm spectral width 0.5 MW peak power pulses was achieved at the output. FROG measurements reveal linear chirp that allow one to expect decompression these down sub-100 fs duration.

The use of double-clad fibers for short pulses amplification requires high active ions concentration in order to keep the fiber length short. In case Er-doped an increase leads a significant drop efficiency due Er clustering. We have demonstrated through numerical simulation that amplifiers based on P₂O₅-Al₂O₃-SiO₂ (PAS) decreases slower with Er-concentration growth if compared standard Al₂O₃-SiO₂ fibers....

The amplification of ultrashort signals in the range 2.7 – 3 μm active tellurite glass fibres with high Kerr nonlinearity and concentration erbium ions core is theoretically investigated under diode pumping at a wavelength 0.975 μm. possibility producing pulses energy ∼10 nJ duration smaller than 100 fs ∼20 dB gain shown. Moreover, using specially developed iterative computer algorithm, determining intensity phase generated by measuring their fundamental spectra two additional obtained means...

Chirped pulse monolithic fiber amplifier based on a newly developed tapered polarization maintaining Yb-doped has been and optimized. A novel amplification regime in relatively long (220 cm) of improved design, which theoretically predicted, allowed us to achieve an ultimate high peak power. In this regime, the signal propagates most without growths very rapidly only last 80 cm fiber, mode field area approximately 1000 &mu;m² near output. We have demonstrated 20 ps chirped pulses...

An all-fiber high-power erbium-doped fiber laser (EDFL) source generating optical pulses from 200 µs to 5 ms with a stable rectangular envelope for fractional photo-rejuvenation is proposed and experimentally demonstrated. A master oscillator power amplifier (MOPA) configuration composed of oscillator, an acousto-optic modulator (AOM), one-stage designed employed in the EDFL serve as efficient system excellent output performance. To avoid multistage amplifiers, generates 1.5 W, Yb-free...