Abstract Polymer composites are one of the most attractive near‐term means to exploit unique properties carbon nanotubes and graphene. This is particularly true for aimed at electronics photonics, where a number promising applications have already been demonstrated. One such example nanotube‐based saturable absorbers. These can be used as all‐optical switches, optical amplifier noise suppressors, or mode‐lockers generate ultrashort laser pulses. Here, we review various aspects fabrication,...

We investigate photoluminescence of nanotube bundles. Their spectra are explained by exciton energy transfer between adjacent tubes, whereby excitation large gap tubes induces emission from smaller ones. The consequent relaxation rate is faster than nonradiative recombination, leading to enhanced acceptor tubes.

Ink-jet printing is an important process for placing active electronics on plastic substrates. We demonstrate ink-jet as a viable method large area fabrication of carbon nanotube (CNT) thin film transistors (TFTs). investigate different routes producing stable CNT solutions (“inks”). These consist dispersion methods debundling and the use solvents, such N-methyl-2-pyrrolidone. The resulting printable inks are dispensed by onto electrode bearing silicon source to drain gap bridged percolating...

We present a simple method to stabilize single-wall carbon nanotube (SWNT) dispersions in N-methyl-2-pyrrolidone (NMP) by polyvinylpyrrolidone (PVP). A significant population of isolated SWNTs as well small bundles NMP is obtained ultrasonic treatment followed vacuum filtration through glass fiber filters. The resulting pure are monitored photoluminescence (PL) spectroscopy over period 3 weeks. PL intensities such decrease with time, suggesting slow microscopic aggregation nanotubes....

Carbon nanotube polycarbonate composites with controlled nanotube-bundle size are prepared by dispersion conjugated polymers followed blending polycarbonate. The composite has uniform sub-micrometer bundles in high concentration, shows strong nonlinear optical absorption, and generates 193 fs pulses when used as passive mode-locker a fiber laser.

Ultrafast fiber sources having short pulses, broad bandwidth, high energy, and low amplitude fluctuations have widespread applications. Stretched-pulse lasers, incorporating segments of normal anomalous dispersion fibers, are a preferred means to generate such pulses. We realize stretched-pulse laser based on nanotube saturable absorber, with 113 fs 33.5 nm spectral width ˜0.07% fluctuation, outperforming current nanotube-based designs.

We demonstrate that mode-locking of ytterbium fiber lasers with a carbon nanotube saturable absorber can produce pulses ranging from 20 ps to 2 ns at repetition rates between 21 MHz and 177 kHz, respectively, depending on cavity length. Nonlinear polarization evolution is not responsible for mode-locking. Even in the nanosecond regime, clean single are observed pulse train exhibits low jitter. Combined extremely large chirp, these properties suited chirped-pulse amplification systems.

Abstract Carbon nanotubes (CNTs) possess both remarkable optical properties and high potential for integration in various photonic devices. We overview, here, recent progress CNT applications fibre optics putting particular emphasis on lasers. discuss fabrication characterisation of different CNTs, development CNT-based saturable absorbers (CNT-SA), their operation laser cavities state-of-the-art lasers, mode locked using CNT-SA. new design concepts high-performance ultrafast lasers covering...

Two fundamental laser physics phenomena--dissipative soliton and polarisation of light are recently merged to the concept vector dissipative (VDS), viz. train short pulses with specific state (SOP) shape defined by an interplay between anisotropy, gain/loss, dispersion, nonlinearity. Emergence VDSs is both scientific interest also a promising technique for control dynamic SOPs important numerous applications from nano-optics high capacity fibre optic communications. Using specially designed...

This work analyzes the anti-icing performance of flat aluminum surfaces coated with widely used alkyl-group based layers octadecyltrimethoxysilane, fluorinated alkylsilane and stearic acid as they are subjected to repeated icing/deicing cycles. The wetting properties samples upon long-term immersion in water also evaluated. results demonstrate that smooth grafted alkyl groups prone gradual degradation their hydrophobic icephobic properties, which is caused by interactions reactions both ice...

We study the difference in mode-locked operations of different saturable absorber films made single wall carbon nanotube-polyvinylalcohol nanocomposite. The have nanotube concentrations and thicknesses. For study, a erbium-doped fiber laser ring cavity configuration was constructed by setting microgap between pair end facets. With optimum film among those we tested, shortest pulses with width 178fs were achieved at 1.56μm repetition rate 22.8MHz an average power 1.55mW.

We report ultrafast highly chirped pulses from an erbium doped, nanotube-mode-locked fiber oscillator. generate 1.6W average power and 11kW peak by seeding a amplifier. This paves the way to mode-locked all-fiber master oscillator amplifiers as economic compact sources for high-power applications, such micromachining laser surgery.

We extract the distribution of both center-of-mass and angular fluctuations from three-dimensional tracking optically trapped nanotubes. measure optical force torque constants autocorrelation cross-correlation signals. This allows us to isolate Brownian motion. demonstrate that nanotubes enable nanometer spatial femtonewton resolution in photonic microscopy, smallest date. has wide implications nanotechnology, biotechnology, nanofluidics, material science.

We fabricate a nanotube-polyvinyl alcohol saturable absorber with broad absorption at 1.6 μm. demonstrate pulsed fiber laser working in the telecommunication L band by using this composite as mode locker. This gives ∼498±16 fs pulses 1601 nm 26.7 MHz repetition rate.

We report an all-fiber mode-locked erbium-doped fiber laser (EDFL) employing carbon nanotube (CNT) polymer composite film. By using only standard telecom grade components, without any complex polarization control elements in the cavity, we have demonstrated locked vector solitons generation with duration of ~583 fs, average power ~3 mW (pulse energy 118 pJ) at repetition rate ~25.7 MHz.

We examined methods of controlling the pulse duration, spectral width and wavelength output from an all-fiber Yb laser mode-locked by carbon nanotubes. It is shown that a segment polarization maintaining (PM) fiber inserted into standard single mode based cavity can function as selective filter. Adjustment length PM 1 to 2 m led corresponding variation in duration 3.8 ps, bandwidth changes 0.15 1.26 nm. Laser detuning within up 5 nm was demonstrated with fixed adjustment controller.

We investigate the modification of optical properties carbon nanotubes (CNTs) resulting from a chemical reaction triggered by presence specific compound (gaseous dioxide (CO2)) and show this mechanism has important consequences for sensing. CNTs have attracted significant research interest because they can be functionalized particular chemical, yielding physical response which suggests many potential applications in fields nanotechnology So far, however, utilizing their purpose proven to...

We report experimental observation of new tightly and loosely bound state vector solitons with locked precessing states polarization in a carbon nanotube mode fiber laser the anomalous dispersion regime.

We have proposed and demonstrated a Q-switched Thulium doped fibre laser (TDFL) with 'Yin-Yang' all-fibre cavity scheme based on combination of nonlinear optical loop mirror (NOLM) amplified (NALM). Unidirectional lasing operation has been achieved without any intracavity isolator. By using carbon nanotube polymer composite saturable absorber (SA), we the output power ~197 mW pulse energy 1.7 μJ. To best our knowledge, this is highest from SA laser.

ZnO nanomaterials with controlled size, shape and surface chemistry are required for applications in diverse areas, such as optoelectronics, photocatalysis, biomedicine so on. Here, we report on nanostructures rod-like spherical shapes prepared via laser ablation liquid using a millisecond-long pulses. By changing parameters (such pulse width peak power), the size or aspect ratio of could be tuned. The defects products were also strongly affected by applied conditions. preparation different...

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...

A diode-cladding-pumped mid-infrared passively Q-switched Ho3+-doped fluoride fiber laser using a reverse designed broad band semiconductor saturable mirror (SESAM) was demonstrated. Nonlinear reflectivity of the SESAM measured an in-house Yb3+-doped mode-locked at 1062 nm. Stable pulse train produced slope efficient 12.1% with respect to launched pump power. Maximum energy 6.65 µJ width 1.68 µs and signal-to-noise ratio (SNR) ~50 dB achieved repetition rate 47.6 kHz center wavelength 2.971...