scholarly journals Pulse-onset dynamics in a bidirectional mode-locked fibre laser via instabilities

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Igor Kudelin ◽  
Srikanth Sugavanam ◽  
Maria Chernysheva
Keyword(s):  
Coherent Structures ◽  
Background Radiation ◽  
Ultrashort Pulses ◽  
Fibre Laser ◽  
Test Bed ◽  
Fibre Lasers ◽  
Central Wavelength ◽  
Pulse Formation ◽  
Time Observation ◽  
Dynamical Instabilities

Abstract Real-time observation of the emergence of coherent structures from noise via instabilities is of particular interest across disciplines ranging from biology to astrophysics. In the context of photonics, ultrafast fibre lasers provide an ideal test-bed for experimental observation of dynamical instabilities and generation of coherent structures of ultrashort pulses. Here we present experimentally obtained switch-on dynamics of counter-propagating ultrashort pulses in a bidirectional mode-locked fibre laser with delayed pulse formation via Q-switched and modulation instabilities, pronounced central wavelength drift, with the multiple-pulse formation. We define a localisation parameter using the round-trip resolved autocorrelation function to quantify the extent of the pulse formation, indicating an energy interchange between coherent features and background radiation. Furthermore, we report the formation of synchronised and unsynchronised dispersion waves. Our results reveal the complexity of the establishment of coherent features and their interaction with background radiation, contributing further towards the understanding of nonlinear systems in general.

Use of single-mode pumping as a method for suppressing mode instability in fibre lasers by an example of a 100-W narrowband Yb-doped fibre laser

2018 ◽  
Vol 48 (12) ◽  
pp. 1095-1098
Author(s):  
A A Surin ◽  
A A Molkov ◽  
T E Borisenko ◽  
K Yu Prusakov
Keyword(s):  
Single Mode ◽  
Fibre Laser ◽  
Fibre Lasers ◽  
Mode Instability

High order cascade Raman generation and soliton-like pulse formation in a 1.06 μm pumped fibre laser

1988 ◽  
Vol 66 (4) ◽  
pp. 231-234 ◽  
Author(s):  
V.L. da Silva ◽  
A.S.L. Gomes ◽  
J.R. Taylor
Keyword(s):  
High Order ◽  
Fibre Laser ◽  
Pulse Formation

scholarly journals Optical turbulence and spectral condensate in long fibre lasers

2012 ◽  
Vol 468 (2145) ◽  
pp. 2496-2508 ◽  
Author(s):  
E. G. Turitsyna ◽  
Gregory Falkovich ◽  
Atalla El-Taher ◽  
Xuewen Shu ◽  
Paul Harper ◽  
...  
Keyword(s):  
Numerical Simulations ◽  
Intermediate State ◽  
Experimental Results ◽  
Fibre Laser ◽  
Optical Turbulence ◽  
Fibre Lasers ◽  
Sharp Transition ◽  
Narrow Spectrum ◽  
Good Agreement

We study numerically optical turbulence using the particular example of a recently created, ultra-long fibre laser. For normal fibre dispersion, we observed an intermediate state with an extremely narrow spectrum (condensate), which experiences instability and a sharp transition to a fluctuating regime with a wider spectrum. We demonstrate that the number of modes has an impact on the condensate's lifetime. The smaller the number of modes, the more resistant is the condensate to perturbations. Experimental results show a good agreement with numerical simulations.

Fibre laser with a subterahertz repetition rate of ultrashort pulses in the telecom range

2016 ◽  
Vol 46 (4) ◽  
pp. 387-391 ◽  
Author(s):  
A V Andrianov ◽  
V M Mylnikov ◽  
M Yu Koptev ◽  
S V Muravyev ◽  
A V Kim
Keyword(s):  
Repetition Rate ◽  
Ultrashort Pulses ◽  
Fibre Laser

scholarly journals Towards high-power mid-IR light source tunable from 3.8 to 4.5 µm by HBr-filled hollow-core silica fibres

2022 ◽  
Vol 11 (1) ◽  
Author(s):  
Zhiyue Zhou ◽  
Zefeng Wang ◽  
Wei Huang ◽  
Yulong Cui ◽  
Hao Li ◽  
...  
Keyword(s):  
High Power ◽  
Continuous Wave ◽  
Transmission Loss ◽  
Coupling Efficiency ◽  
Fibre Length ◽  
Fibre Laser ◽  
Hollow Core ◽  
Fibre Lasers ◽  
Fibre Amplifier ◽  
Ir Emission

AbstractFibre lasers operating at the mid-IR have attracted enormous interest due to the plethora of applications in defence, security, medicine, and so on. However, no continuous-wave (CW) fibre lasers beyond 4 μm based on rare-earth-doped fibres have been demonstrated thus far. Here, we report efficient mid-IR laser emission from HBr-filled silica hollow-core fibres (HCFs) for the first time. By pumping with a self-developed thulium-doped fibre amplifier seeded by several diode lasers over the range of 1940–1983 nm, narrow linewidth mid-IR emission from 3810 to 4496 nm has been achieved with a maximum laser power of about 500 mW and a slope efficiency of approximately 18%. To the best of our knowledge, the wavelength of 4496 nm with strong absorption in silica-based fibres is the longest emission wavelength from a CW fibre laser, and the span of 686 nm is also the largest tuning range achieved to date for any CW fibre laser. By further reducing the HCF transmission loss, increasing the pump power, improving the coupling efficiency, and optimizing the fibre length together with the pressure, the laser efficiency and output power are expected to increase significantly. This work opens new opportunities for broadly tunable high-power mid-IR fibre lasers, especially beyond 4 μm.

scholarly journals Real-time observation of the optical Sagnac effect in ultrafast bidirectional fibre lasers

APL Photonics ◽  
2020 ◽  
Vol 5 (1) ◽  
pp. 016104 ◽  
Author(s):  
M. Chernysheva ◽  
S. Sugavanam ◽  
S. Turitsyn
Keyword(s):  
Real Time ◽  
Sagnac Effect ◽  
Fibre Lasers ◽  
Time Observation ◽  
Real Time Observation

Coherent combining of two pulsed fibre lasers in phase modulated mutually coupled fibre laser array

2008 ◽  
Vol 44 (21) ◽  
pp. 1238 ◽  
Author(s):  
P. Zhou ◽  
X. Wang ◽  
Z. Chen ◽  
X. Li ◽  
Z. Liu ◽  
...  
Keyword(s):  
Fibre Laser ◽  
Laser Array ◽  
Fibre Lasers ◽  
Coherent Combining

The self similar pulse formation study of mode-locked fibre lasers

2007 ◽  
Author(s):  
Chenghou Tu ◽  
Ting Lei ◽  
Wengang Guo ◽  
Dai Wei ◽  
Hui Zhu ◽  
...  
Keyword(s):  
The Self ◽  
Fibre Lasers ◽  
Self Similar ◽  
Pulse Formation

Fibre laser cutting: Beam absorption characteristics and gas-free remote cutting

2009 ◽  
Vol 224 (5) ◽  
pp. 1007-1018 ◽  
Author(s):  
A Mahrle ◽  
M Lütke ◽  
E Beyer
Keyword(s):  
Laser Cutting ◽  
Beam Quality ◽  
Sheet Thickness ◽  
Practical Experience ◽  
Fibre Laser ◽  
Experimental Fact ◽  
Attractive Alternative ◽  
Fibre Lasers ◽  
Laser Systems ◽  
Absorption Characteristics

Laser cutting is still the most common industrial application of CO 2 laser systems but currently available high-power fibre lasers seem to be an attractive alternative to the established CO 2 laser sources for several cutting tasks. Practical experience has shown that fibre lasers enable significantly increased travel rates in the case of inert-gas fusion cutting. This advantage in achieving higher cutting speeds in comparison to CO 2 laser cutting is however a clear function of the sheet thickness to be cut. In the first part of this article, possible reasons for this experimental fact are derived from a thermodynamic analysis of the process with consideration of the specific beam absorption characteristics under cutting conditions. After that, in the second part, a quite new laser cutting variant, namely the gas-free remote cutting process that considerably benefits from the high beam quality of fibre laser systems, is presented.

scholarly journals Using a High-Power Fibre Laser to Cut Concrete

2021 ◽  
Vol 11 (10) ◽  
pp. 4414
Author(s):  
Kaori Nagai ◽  
Kazuki Shimizu
Keyword(s):  
Urban Areas ◽  
High Strength Concrete ◽  
High Strength ◽  
Fibre Laser ◽  
Low Density ◽  
Construction Sites ◽  
Fibre Lasers ◽  
High Quality ◽  
Strength Concrete ◽  
Noise Vibration

Concrete cutting at construction sites causes problems such as noise, vibration, and dust. In particular, during the demolition and renovation work on buildings in urban areas, protection against noise, vibration, dust, etc., is needed. Concrete cutting using a CO2 laser was investigated 20 years ago. However, this method had never used because the equipment is difficult to carry. In this study, we used a portable fibre laser, which is convenient to carry. Two types of concretes with different strengths were prepared for the experiment. High-strength concrete has never been used in similar research before. High-strength concrete is just only used for skyscrapers because of its high quality and costs. Furthermore, it has already been used for skyscrapers in Japan. It is for this reason that we chose to use it in this study. Irradiation measurements were conducted under various conditions using laser powers of 6 and 9 kW. It was confirmed that the cutting effectiveness of CO2 and fibre lasers was approximately identical for concretes with a thickness of 200 mm. Furthermore, the cutting effectiveness for the two concretes with different densities was almost the same. However, the situation after cutting was different because the vitrification of the cutting and glass formation progressed in low-density concrete and an explosion phenomenon occurred in high-density concrete, simultaneously. This study suggests that laser concrete cutting can be used as a solution when noise and dust are major problems.

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