Micro-channels were fabricated in hollow-core photonic bandgap fiber (HC-PBGF) and suspended-core holey fiber (SC-HF) by femtosecond Ti:sapphire laser irradiation. Gaseous access was demonstrated via these engineered ports to the core of HC-PBGF and the hollow cladding of SC-HF. Femtosecond laser micro-machining caused no additional transmission loss in HC-PBGFs. This allowed a novel gas cell t...

Solid freeform fabrication (SFF) methods for metal part building, such as three-dimensional laser cladding, are generally less stable and less repeatable than other rapid prototyping methods. A large number of parameters govern the three-dimensional laser cladding process. These parameters are sensitive to the environmental variations, and they also in ̄uence each other. This paper introduces th...

In spite of excellent corrosion resistance, good ductility and low cost of AISI 316 austenitic stainless steel, the low hardness and poor mechanical charecteristic of material restricts its applicability in several industrial services. To improve upon mechanical properties AlFeCuCrCoNi-WC10 high-entropy alloy coatings were deposited via laser cladding on austentic stainless steel AISI 316 subst...

The heating of a semiconductor laser bar imbedded between two heat spreaders has been studied theoretically and experimentally. The model included the p-cladding layer, active region, n-cladding layer, and n-substrate. Heat sources from the active region and both cladding layers were considered. An analytical relation was obtained between the temperature distribution in the laser and the bar ge...

We present pulsed laser operation in a Nd-doped, Y3Al5O12-based silica fiber. The fiber was fabricated using the rod-in-tube technique with a Nd:YAG crystal rod as the core material and a silica tube for the cladding material. A spectroscopy study revealed that the core region had become amorphous in the process of fiber drawing. Q-switched pulsed laser operation was realized at a wavelength of...

Fe60 laser cladding coating was prepared on the surface of 45 steel with assistance alternating magnetic field–mechanical vibration coupling field. The XRD results show that is mainly composed solid solution Ni-Cr-Fe, (Fe, Ni), and Fe-Cr also contains a certain amount Cr2Fe14C hard phase. In process cladding, chemical composition not affected by Under interaction field, liquid metal in molten p...

Laser cladding is a relatively fast and precise metal deposition process that has been widely applied to deposit coatings to protect parts from wear and/or corrosion and to rebuild worn surfaces of expensive components such as jet engine turbine blade tips. Economic development of laser cladding process applications is impeded by lack of a capability to accurately predict the results of complex...

Laser coating is a material placement technique wherein powder melted using laser to coat portion of substrate. In this study, cladding and its applications are reviewed. First, background the important parameters highlighted. Then, control procedure criticized. As an example process, titanium alloys investigated. Finally, on gas turbine engines, dies drilling spindles, tools, blades

Ni-Co duplex coatings were cladded onto Cu to improve the antiwear properties of Cu products. Prior to laser cladding, n-Al₂O₃/Ni layers were introduced as interlayers between laser cladding coatings and Cu substrates to improve the laser absorptivity of these substrates and ensure defect-free laser cladding coatings. The structure and morphology of the coatings were characterized by scanning e...

objective: the aim of this study was to investigate the effect of laser assisted hatching on the development and quality of vitrified-warmed 4-cell stage mouse embryos. materials and methods: the vitrified-warmed 4-cell mouse embryos were divided into two groups: control group (without laser assisted hatching) and experiment group (with laser assisted hatching). all embryos in both groups were ...