Glass-clad Cr^4+:YAG crystal fiber for the generation of superwideband amplified spontaneous emission

Abstract

Glass-clad Cr4+:YAG crystal fiber is demonstrated by a codrawing laser-heated pedestal growth method. As much as 2.45 mW of superwideband amplified spontaneous emission (ASE) is generated in the optical fiber communication band with a 3-dB width of 240 nm. The simulation indicates that the ASE power could be in excess of 20 dBm for a 5-microm-diameter core at a pump power of 2.5 W.

Full-depth epidermis tomography using a Mirau-based full-field optical coherence tomography

“…The 3-D measurements of a-TT and a-NOLs from buttock with deducting hydration are 14.56 ± 2.38 μm and 11.72 ± 3.00, respectively. In the literature, a-TT and a-NOLs of the SC at buttock using frozen section are respectively 14.9 ± 3.4 μm (m = 61) [31] and 12 ± 4 (m = 20) [12,22], where m means the number of samples. Actually, histological biopsy is difficult to provide 3-D information of SC.…”

“…In this study, a Ce 3+ :YAG single-clad crystal fiber (SCF), drawn by laser-heated pedestal growth [22] and cladded by borosilicate glass [23], provides high brightness and high numerical aperture (NA) output light. The diameters of core and cladding are correspondingly 90 and 330 μm.…”

Nanostructure formation of double-clad Cr4+:YAG crystal fiber grown by co-drawing laser-heated pedestal

“…Cr 4+ -doped YAG can generate near-infrared fluorescence spectrum at 1.2-1.6 mm [7]. Such wideband characteristics are needed as light source for optical communications [8]. A double-clad Cr 4+ :YAG crystal fiber technique employing a co-drawing laser-heated pedestal growth (CDLHPG) method was developed [9].…”

Fluorescence mapping of oxidation states of Cr ions in YAG crystal fibers

“…Nevertheless, the glass hosts still suffer from lower absorption and emission efficiency as compared to Cr 4+ -doped laser crystals [8,11,12]. A co-drawing laser heated pedestal growth (CDLHPG) method has been developed to pull Cr 4+ :YAG crystal fibers, which generated greater than milliwatts of amplified spontaneous emission [13]. In addition, crystal fibers have been shown to be compact and cost-effective in the implementation of solid-state lasers and nonlinear frequency conversion media [14][15][16].…”