Abstract The complex nonlinear dynamics of mode-locked fibre lasers, including a broad variety dissipative structures and self-organization effects, have drawn significant research interest. Around the 2 μ m band, conventional saturable absorbers (SAs) possess small modulation depth slow relaxation time and, therefore, are incapable ensuring inter-pulse bound-state soliton generation. We present observation multi-soliton generation in thulium (Tm)-doped laser, using double-wall carbon...

Abstract Carbon nanotubes (CNTs) possess remarkable nonlinear optical properties; a particular application is to function as mode locker used in ultrafast fiber lasers produce ultrashort pulses. Various types of CNT saturable absorbers (SAs) and have been demonstrated. In this review, typical fabrication process development SAs are discussed we highlight the recent investigation progress state-of-the-art covering GHz, bidirectional lasers, vectorial comb systems, mode-locking dynamics. Our...

The emergence of low-dimensional materials has opened new opportunities in the fabrication compact nonlinear photonic devices. Single-walled carbon nanotubes were among first those to attract attention photonics community owing their high third order susceptibility, broadband operation, and ultrafast response. Saturable absorption, particular, become a widespread application for mode-locking fiber laser where they are used as passive amplitude modulators initiate pulsed operation. Numerous...

GHz femtosecond fiber lasers are being developed to meet the demands of state-of-the-art applications such as high-speed optical communication and ablation-cooled material removal. Harmonic mode locking (HML) opens a portal generate ultrashort pulses. However, impact saturable absorber (SA) in controlling laser repetition rate has long been overlooked. Herein, we successfully boost HML ∼10 by engineering nonlinear absorption film-type single-walled carbon nanotube (SWCNT) SA. Our study first...

An Erbium-doped fibre ring laser hybrid mode-locked with single-wall carbon nanotubes (SWNT) and nonlinear polarisation evolution (NPE) without an optical isolator has been investigated for various cavity conditions.Precise control of the state (SOP) in ensures different losses counter-propagating fields.As result, operates quasi-unidirectional regime both clockwise (CW) counter-clockwise (CCW) directions emission strengths difference 22 dB.Furthermore, by adjusting net birefringence cavity,...

We present a passively mode-locked Erbium-doped fiber laser with tunable parameters including central wavelength, 3-dB bandwidth, and pulse duration. The mode-locking mechanism of the is realized by using single-walled carbon nanotubes (SWCNTs) polyvinyl alcohol composite film as saturable absorber. operation implemented via birefringence filter consisting polarization maintaining (PM) Brewster grating. achieves maximum spectral tuning range 36 nm 8-cm PM fiber. width variation 5.19 acquired...

Soliton rain is a bunch of small soliton pulses accompanying the main pulse with period round trip. It was found previously that soliton-soliton interaction through overlapping their tails or soliton-dispersive wave can result in spikes an anomalous amplitude satisfying rogue waves (RW) criteria. Here, we report for first time on experimental observation polarization dynamics erbium–doped fiber laser mode-locked by single wall carbon nanotubes. Unlike previous study, have be driven hole...

We experimentally demonstrate a passively harmonic mode locked (PHML) Er-doped fiber laser with pump power efficiency up to 17 MHz/mW operating at L-band based on single walled carbon nanotubes polyvinyl alcohol (SWCNTs-PVA) film. Under 233 mW power, the stable pulse train 1594.97 nm 40.5 dB side suppression ratio (SMSR) and 742 fs duration is obtained repetition rate of 1.923 GHz, corresponding 170 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...

We demonstrate an L-band wavelength-tunable passively mode-locked fiber laser using a single long-period grating (LPFG) as narrow-band optical attenuator (NBOA). Through bending the LPFG, central wavelength can be continuously tuned from 1582.02 to 1597.29 nm, while output power only varies 1.465 1.057 mW, approximately rate of 22 µW/nm variation. This is first time that LPFG functioned NBOA in lasers, showing great advantage less impact on variation reduction. Besides, total cavity length...

Abstract During the last two decades, revealing mechanisms of origin waves with anomalous amplitude (rogue waves) have been in focus researchers from different fields ranging oceanography to laser physics. Mode‐locked lasers, as a test bed system, provide unique opportunity collect more data on rogue form random pulses (soliton rain) and clarify rogue‐wave emergence caused by soliton–soliton soliton–dispersive wave interactions. Here, for first time, an Er‐doped mode‐locked laser, new type...

Composites of single-walled carbon nanotubes (SWNTs) and water-soluble polymers (WSP) are the focus significant worldwide research due to a number applications in biotechnology photonics, particularly for ultrashort pulse generation. Despite unique possibility constructing non-linear optical SWNT-WSP composites with controlled properties, their thermal degradation threshold limit operational power remain unexplored. In this study, we discover nature SWNT-polyvinyl alcohol (PVA) film evaluate...

We systematically study the impact of average cavity dispersion and pulse spectral bandwidth on harmonic mode locking in long-wavelength band from an Er-doped fiber laser using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film locker. By carrying out energy management through optimizing optical bandwidth, 2.08 GHz repetition rate corresponding to 201 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">st</sup> with 36.5 dB side suppression ratio...

Bidirectional wavelength-tunable mode-locked fiber lasers have demands for many applications. In our experiment, two frequency combs from a single bidirectional carbon nanotube erbium-doped laser are obtained. Continuous wavelength tuning is demonstrated in the ultrafast first time. We utilized microfiber assisted differential loss-control effect on both directions to tune operation and it presents different performances directions. Correspondingly, repetition rate difference can be tuned...

We examine the implication of intracavity nonlinearity for harmonic mode locking (HML) by exploiting highly nonlinear fiber in a carbon nanotube film mode-locked Er-doped laser. It is found that reasonably large benefit to increase extent order while excessive leads some peculiar multi-pulse patterns such as noise-like pulse and soliton rain. Via appropriate management, nearly 4 GHz repetition rate pulses at 91st with 936 fs duration are delivered under pump power 280 mW. The stability...

We demonstrate a passively harmonic mode-locked (PHML) fiber laser operating at the L-band using carbon nanotubes polyvinyl alcohol (CNTs-PVA) film. Under suitable pump power and an appropriate setting of polarization controller (PC), 54th pulses are generated with side mode suppression ratio (SMSR) better than 44 dB repetition frequency 503.37 MHz. Further increasing leads to higher 550 MHz compromised stability 38.5 SMSR. To best our knowledge, this is first demonstration on generation...

Abstract We report experimental observation of polarization attractors in the form vector dissipative solitons from a carbon nanotube mode locked fiber laser. At time scale 14–14,000 roundtrips, typical solitons, and other appealing are shown. In addition, we observe operated dual-wavelength regime with central wavelength 1533 1557 nm which can be related to fixed point attractor. The results unveiled complex oscillatory behavior domain may help understand laser physics, nonlinear optics....

The unique properties of carbon nanotubes have made them the material choice for many current and future industrial applications. As a consequence increasing development nanotechnology, show potential threat to health environment. Therefore, efficient method detection is required. In this work, we studied interaction indopentamethinedioxaborine dye (DOB-719) single-walled (SWNTs) using absorption photoluminescence (PL) spectroscopy. mixture SWNTs revealed new optical features in spectral...

Interest in gas sensing using functionalised carbon nanotubes is a major area of research that up until now have utilised their electrical properties, here the optical properties are exploited and used to detect specific gas.

The possibility of using the principle photoelectric conversion in structures with a deep p-n junction to control content carbon nanotubes adsorbed surfactant (SDBS) an aqueous solution was shown. Experimental studies analyte influence on change photocurrent through were carried out. A shift dependence voltage applied surface sensor structure due presence recorded. effective recombination rate, which corresponds distribution at surface, can be attributed near-surface band bending.

Abstract Petroleum Development Oman (PDO) purpose is to "build a sustainable and low-carbon future maximise value for Oman". In line with this, the Rotating Equipment function has begun an energy efficiency journey by saving electrical power, reducing fuel gas consumption cutting Greenhouse Gas (GHG) emissions, thereby also Operating expenditure (OPEX) its Unit Cost (UOC). A study been initiated look opportunities checking running parameters of equipment units compared their design as some...

A passively harmonic mode-locked Er-doped fiber laser based on carbon nanotubes film is demonstrated. The 42 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">nd</sup> order of mode-locking corresponding to 1.15 GHz with 39.17 dB super-mode suppression ratio obtained for the first time.

We have demonstrated an all-fiber passively mode locked erbium-doped fiber laser (EDFL) based on graphene polyvinyl alcohol (PVA) film.By watchfully adjusting polarization controller (PC), two different attractors including vector solitons (PLVSs) and circular attractor can be observed.This is first time to explore the dynamics exhibited by soliton generated from EDFL graphene.

We have investigated a hybrid mode-locked Erbium-doped fibre ring laser without optical isolator. Creating different losses in the cavity for counter-propagating pulses via net birefringence adjusting, can operate both unidirectional regimes with extinction over 22 dB, as well establish stable bidirectional generation.