نتایج جستجو برای: double clad fibers
تعداد نتایج: 311116 فیلتر نتایج به سال:
Vortex beams carrying orbital angular momentum (OAM) have increasingly attracted attention in the field of optical communication. However, transmission is still an issue due to loss, especially fibers. In this work, we proposed, designed, and fabricated micro spiral phase plates (SPPs) directly on end facet a piece PbSe-doped ring-core fiber (RCF) through two-photon polymerization, realizing in...
Microstructured or "air-clad" fibers, with air holes surrounding a large core, have recently demonstrated much wider light-acceptance angles than conventional fibers. An original and accurate method is presented for determining the numerical aperture of such fibers using leaky modes. The dependence on length, wavelength, and various microstructure dimensions are evaluated for the first time for...
We present a double-clad fiber coupler (DCFC) for use in confocal endomicroscopy to reduce speckle contrast, increase signal collection while preserving optical sectioning. The DCFC is made by incorporating a double-clad tapered fiber (DCTF) to a fused-tapered DCFC for achromatic transmission (from 1265 nm to 1325 nm) of > 95% illumination light trough the single mode (SM) core and collection o...
In this paper, a new structure is provided for the dispersion compensating photonic crystal fibers in order to broaden the chromatic dispersion and increase the dispersion compensating capability in a wide wavelength range. In the structure, putting a combination of circular holes and a star structure in the inner core clad causes the dispersion coefficient profile to be broadened, and addition...
Double-clad fibers where the second cladding has a lower refractive index than first cladding, prove to be ideal structures for potentiating and tuning sensitivity in long-period fiber gratings (LPFGs) operating mode transition. When thin film is deposited on optical fiber, performs acts as barrier that initially prevents transition guidance of one modes guided cladding. Finally, occurs with in...
We have computed the light transport in a bre in the geometrical optics approximation. The aim of this study is to compare the performances of single and double clad bres and to outline possible improvements to bre design.
A nanoparticle (NP) doping technique was developed for fabricating erbium (Er)- and holmium (Ho)-doped silica-based optical fibers for high energy lasers. Slope efficiencies in excess of 74% were realized for Er NP doping in a single mode fiber based master oscillator power amplifier (MOPA) and 53% with multi-Watt-level output in a resonantly cladding-pumped power oscillator laser configuration...
Since the double-clad fiber architectures development, fiber-based lasers have witnessed an impressive power scaling [1]. The rise of the extracted signal power has been accompanied by the development of Very Large Mode Area (VLMA) fiber designs allowing the overtake of some key hurdles like the non-linear process or photo-darkening [2]. However, due to a significant deposition of heat along an...
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