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High-Luminance White-Light Point Source Using Ce,Sm : YAG Double-Clad Crystal Fiber

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8 Author(s)
Yen-Sheng Lin ; Graduate Institute of Photonics and Optoelectronics, National Taiwan University, Taipei, Taiwan, R. O. C. ; Tzu-Chieh Cheng ; Chien-Chung Tsai ; Kuang-Yu Hsu
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Ce and Sm ions codoped yttrium aluminum garnet (Ce,Sm : YAG) double-clad crystal fibers (DCFs) were successfully fabricated using the codrawing laser-heated pedestal growth method. At a pump wavelength of 446 nm, white-light point source was produced from a 10--core DCF. The amplified spontaneous emissions and the residual pump resulted in a directional high brightness point source. A luminance of 4.5 × 109 cd/m2 was generated. The luminous flux of the point white light was 6.2 lm. When coupled to a 200-core multimode fiber, the output power and coupling efficiency were 4.8 mW and 36.8%, respectively. Point white-light sources are useful for biomedical endoscopic application and long-range directive illumination. The generated broadband yellow emission can also be served as the light source for optical coherence tomography system. Using the 91-nm yellow emission, an axial resolution of 1.5-optical coherence tomography can be achieved for ultrahigh-resolution ocular and industrial applications.

Published in:

IEEE Photonics Technology Letters  (Volume:22 ,  Issue: 20 )