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Study on the core/cladding interface in Cr:YAG double-clad crystal fibers grown by the codrawing laser-heated pedestal growth method
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10.1063/1.3467517
/content/aip/journal/jap/108/5/10.1063/1.3467517
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/5/10.1063/1.3467517
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Side view of an as-grown Cr:YAG single crystal fiber with a diameter grown by the LHPG method. (b) The corresponding SEM end face image. The [111] hexagonal shape is apparent. (c) The drawing of the YAG atomic structure viewed from [111] crystal orientation.

Image of FIG. 2.
FIG. 2.

(a) Polished end face and side view images of DCF. The core, inner cladding, and outer-cladding diameters are , , and , respectively. (b) The major composition line-scan profiles measured by EPMA. (c) Left: HRTEM image of the core region with the imaging electron beam along the [111] direction; center: a computer simulated image ( and ) that optimally fits the experimental one; right: atomic column positions of Y, Al, and O. The scale bars of all images represent 5 Å.

Image of FIG. 3.
FIG. 3.

[111] zone axis HRTEM image of core/inner-cladding interface with several nanocrystals located in the inner-cladding, as marked by the arrows.

Image of FIG. 4.
FIG. 4.

(a) HRTEM image of core/inner-cladding interface. The inset is the corresponding FFT pattern. (b) Schematic representation of the FFT pattern with the YAG reciprocal lattice revealing the orientation relationship between the nanocrystal and the YAG core.

Image of FIG. 5.
FIG. 5.

(a) Highly magnified HRTEM image of the core/inner-cladding interface showing a [011] nanocrystal with a local orientation relationship to the YAG [011] core. The inset is the corresponding FFT pattern. (b) Schematic representation of the FFT pattern and YAG reciprocal lattice.

Image of FIG. 6.
FIG. 6.

(a) A highly magnified HRTEM image at the core/inner-cladding interface. (b) The reciprocal space diffraction is obtained by the FFT of a selected area in the HRTEM image of (a). The data is then filtered to obtain the and diffractions, containing information of the lattice spacing in the vertical and lateral directions, respectively. (c) and (d) show the distribution of the strain components away from the interface. The solid squares are measured values, and the solid lines are the curve fitted results, indicating that an average strain layer gives rise to a uniform zero strain to the reference core region and high single crystallinity of the DCF core. The error bars represent standard deviations of triplicate measurements.

Image of FIG. 7.
FIG. 7.

NIR spectra with a 3 dB bandwidth of over 240 nm generated from the DCF. The inset is the ASE measured output power as a function of the pump power, showing a maximum output power up to milliwatt order.

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/content/aip/journal/jap/108/5/10.1063/1.3467517
2010-09-02
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Study on the core/cladding interface in Cr:YAG double-clad crystal fibers grown by the codrawing laser-heated pedestal growth method
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/5/10.1063/1.3467517
10.1063/1.3467517
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