Title :
High-Luminance White-Light Point Source Using Ce,Sm : YAG Double-Clad Crystal Fiber
Author :
Lin, Yen-Sheng ; Cheng, Tzu-Chieh ; Tsai, Chien-Chung ; Hsu, Kuang-Yu ; Jheng, Dong-Yo ; Lo, Chia-Yao ; Yeh, Ping-Hui S. ; Huang, Sheng-Lung
Author_Institution :
Grad. Inst. of Photonics & Optoelectron., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
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.
Keywords :
cerium; light sources; optical fibre cladding; optical fibre couplers; optical fibre fabrication; optical pumping; optical tomography; samarium; superradiance; yttrium compounds; YAG:Ce,Sm; amplified spontaneous emissions; axial resolution; biomedical endoscopic application; broadband yellow emission; codoped yttrium aluminum garnet; codrawing laser-heated pedestal growth; coupling efficiency; double-clad crystal fiber; high-luminance white-light point source; long-range directive illumination; multimode fiber; optical coherence tomography; optical ultrahigh-resolution ocular; pump wavelength; residual pump; wavelength 446 nm; Aluminum; Biomedical optical imaging; Crystals; Fiber lasers; Garnets; Ions; Light emitting diodes; Light sources; Optical fibers; Optical pumping; Pump lasers; Spontaneous emission; Stimulated emission; Tomography; Yttrium; Broadband light sources; crystal fibers; optical coherence tomography; optical fiber devices;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2010.2064293
