Herein, hybrid nanoparticles composed of a red-emitting conjugated oligomer (COL) and gold (Au-NPs) were prepared through one-pot synthetic method in which the acts as reducing agent well matrix to wrap newly formed Au nanoparticles. These (COL-Au-NPs) exhibited photodynamic photothermal activity against both Gram-positive Gram-negative bacterial strains. They also proven possess high photostability thermal reversibility. Dark cytotoxicity COL-Au-NPs toward pathogens mammalian breast cancer...

We demonstrate a 1018 nm ytterbium-doped all-fiber laser pumped by tunable pump sources operating in the broad absorption spectrum around 915 nm. In experiment, two different diodes were tested to over wide ranging from 904 924 altering cooling temperature of diodes. Across this so-called wavelength regime having 20 span, amplified stimulated emission (ASE) suppression resulting was generally 35 dB, showing good ratio. Comparisons conventional 976 nm-pumped fiber also addressed study....

We demonstrate an all-fiber ultra-low numerical aperture high power fiber laser system operating in the continuouswave regime at a central wavelength of 1080 nm.A special Ytterbium-doped preform has been designed and fabricated by using modified chemical vapor deposition technique with percentages 0.03mol% Yb 2 O 3 , 1.8mol% Al 2.1mol% P 5 .Then it drawn to obtain active having core/cladding diameters 26 µm/410 µm respectively.The first predicted as 0.034 from refractive index profile...

Cladding light strippers (CLSs) are vital and one of the critical components for high-power fiber laser applications. In this study, we show first studies formation mechanisms optimum conditions a CLS device using buffered oxide etchant by combined method stain (wet) etching vapor-phase etching. This was shown to result in stripping performance ∼17.2 dB at launched power 333 W (pump limited). The thermal imaging demonstrates that maximum temperature reached when operating ∼75°C. atomic force...

Estimating the atmospheric turbulence strength ( C n 2 ) becomes significant in research field of electromagnetic radiation transmission through atmosphere, particularly optical waves. As increases, quality and these waves may decrease cause much trouble as they pass atmosphere. Throughout years, has been formulated by different groups for various geographical locations seasons using macro-meteorological variables empirically theoretically. However, since models are based on data collected...

Optical fiber technology has been developed dramatically in the last two decades. Especially, invention of Large Mode Area (LMA) fibers made a great impact, and consequently power scale lasers started to increase exponentially [1]. However, at certain point this saturated due non-linear effects such as Stimulated Raman Scattering (SRS) Thermal Modal Instability (TMI). Therefore, new approach proposed mitigate these so called problems by decreasing numerical aperture (NA) LMA active that it...

Summary form only given. Applications of high power lasers and amplifiers have been increasing because its superior properties such as wall-plug efficiency, excellent beam quality, reliability [1]. Despite advances in fiber components, there is still component based challenges on extraction process unwanted cladding light [2]. There are several techniques to extract the from laser system index polymer coating that working principle violating total internal reflection [2], roughened surface...

High-power fiber lasers have been applied in many areas due to their advantages such as high beam quality, compact structure, flexibility and efficiency. However, the absorption of pump light is limited a residual pumped keeps propagating cladding. This affects quality can damage whole system. Therefore, an efficient removal excess high-power cladding critical for safe operation [1]. Adding new structure leading interrupt total internal reflection clad scatter away unwanted generalized...

Fibers lasers have attracted great attention in the last decades and power scaling has reached tens of kW levels. Especially with tandem pump configuration, pumping active medium a laser light instead diode laser, made breakthrough so many research been conducted about 1018 nm fiber systems [1]. Decreasing quantum defect, slope efficiency could be increased up to 90 % levels; on other hand, due emission cross section Ytterbium (Yb), operate wavelength region is very challenging because...

Fiber lasers are one of the most preferred today's efficient coherent light sources in many application areas with their advantages such as stability, compactness, robustness, diffraction-limited beam quality, large available bandwidth, tuneability, and independence from alignment [1] . With technological material-based advances fiber laser, it has become possible to reach multikilowatt output powers. In high-power lasers, cladding power can more than hundreds watts, this unwanted may affect...

Cladding light stripper (CLS) is a key component for high power fiber laser systems to remove the unwanted sources out of system effectively. If they cannot be removed system, quality beam affected severely. For that purpose, fabrication CLS has been investigated years based on two main approaches. One them etching method [1] , [2] and other one coating [3] [4] . The recoated polymer problem scaling whereas more fragile since deformed even though are capable handling power. However, in this...

Pump combiners have been utilized to combine the power of pump diodes in high fiber laser oscillator and amplifier systems. The common way fabrication with signal feed-through are fused taper bundle (TFB) which is based on end technique also tapered along fibers [1] . Therefore, these type pumping can only be achieved one direction; however, recently it has demonstrated that counter-pumping or bi-directional mechanisms allow scaling up lower non-linear interaction thresholds such as...

Different applications, including interferometers, gyroscopes, and frequency combs, require a single polarized light transmission by maintaining this property against the environmental perturbation. As new type of polarization-maintaining (PM) fiber, biaxial PM fiber was fabricated over 30 dB high polarization extinction ratio (PER) values among two orthogonal axes. The manufactured with combination an elliptical core Panda-type geometries. PER were demonstrated to be preserved at harsh...