Effect of Nanocrystal Structures on Interface of Cr-Doped Yttrium Aluminum Garnet Double-Clad Crystal Fiber

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概要

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• In this study, we investigated both the microstructure and the chemistry of the core/inner cladding interface in Cr-doped yttrium aluminum garnet (Cr:YAG) double-clad crystal fiber by high-resolution transmission electron microscopy. In the axial direction, two contrasting layers were found between the SiO2 inner cladding and the YAG crystal core (with or without heat treatment). Cr3+:$\gamma$-Al2O3 nanocrystals were observed; these nanodomains were slightly tilted at an angle of about 2° from the core YAG structures at the original interface. Subsequently, amorphous oxide layers were formed during codrawing laser-heated pedestal growth. The Cr3+:$\gamma$-Al2O3 nanocrystals had different lattice parameters and showed various structures during growth. The defect density of the core YAG near the interface was reduced after appropriate heat treatment. These results indicated that the growth kinetics can critically affect the interface chemistry in this crystal fiber. The relative fluorescence spectrum of Cr4+ in both low- and high-field sites was significantly affected by the nanocrystal distribution.

• 2009-12-25

著者

• Huang Sheng-lung

  Institute Of Electro-optical Engineering National Sun Yat-sen University

• Huang Kuang-Yao

  Institute of Electro-Optical Engineering, National Sun Yat-sen University, Kaohsiung 804, Taiwan, R.O.C.

• Lin Yen-Sheng

  Department of Electronic Engineering, I-Shou University, Kaohsiung 840, Taiwan

• Lai Chien-Chih

  Institute of Photonics and Optoelectronics, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 106, Taiwan, R.O.C.

• Huang Kuang-Yao

  Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan

• Huang Sheng-Lung

  Institute of Photonics and Optoelectronics, National Taiwan University, Taipei 106, Taiwan

関連論文

• Imaging Photo-induced Reaction of poly(p-phenylenevinylene) Thin Films by a Spectrally Resolved Laser Scanning Microscope
• Design and Optimization of Cr4+:Y3Al5O12 Double-Clad Crystal Fiber Laser
• A Passively Q-Switched Laser Constructed by a Two-Mirror Reentrant Ring Cavity : Optics and Quantum Electronics
• Timing Jitter Reduction of a Passively Q-Switched Laser
• Efficient Nd:Y_3Al_5O_ Crystal Fiber Laser
• Polarization Analysis of a Nonplanar Reentrant Ring Laser Cavity
• Ytterbium-Doped Yettrium Aluminum Garnet Crystal Fiber Multipass Ring Laser
• Effect of Nanocrystal Structures on Interface of Cr-Doped Yttrium Aluminum Garnet Double-Clad Crystal Fiber
• Two-Dimensional Simulations on Heat Transfer and Fluid Flow for Yttrium Aluminium Garnet Single-Crystal Fiber in Laser-Heated Pedestal Growth System
• Compact Passively Q-Switched Yb:YAG Multipass Ring Lasers
• Enhancement of Cr4+ Concentration in Y3Al5O12 Crystal Fiber by Pregrowth Perimeter Deposition
• Laser-Induced Activation of p-Type GaN with the Second Harmonics of a Nd:YAG Laser
• Planar Multipass Ring Laser Cavity

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