Study on the composite Nd:YAG crystal by laser micro-Raman spectroscopy

Abstract

The composite Nd:YAG crystal with undoped YAG end caps was fabricated by thermal bonding technique. Scanning electron microscopy (SEM) result shows that the width of the bonded interface was about 0.5 μm. The laser micro-Raman was used to study the bonded interface of the composite crystal. The results of Raman spectra and the bonded interface image indicate that the undoped YAG and Nd:YAG crystals have been well bonded together. Furthermore, it can be drawn that the structure and the composition of the bonded interface are the same as the undoped YAG crystal, and that the Nd³⁺ ions do not enter the bonded interface and the YAG side. This property is advantageous to decrease the thermal effect of the boned interface and to improve the laser stability.

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