Magnesium-doped potassium lithium niobate crystal and its properties

✍ Scribed by Zhenxiang Cheng; Shujun Zhang; Guangyong Zhou; Jianru Han; Huanchu Chen

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 840 KB
• Volume: 40
• Category: Article
• ISSN: 0960-8974
• DOI: 10.1016/s0960-8974(00)00026-7

✦ Synopsis

High quality magnesium-doped potassium lithium niobate (designated as KLN:Mg) single crystal was grown for the first time. The tetragonal tungsten bronze structure of the Mg:KLN crystal was determined by X-ray powder diffraction, in which the lattice parameters were a=l.262um and c=0.398nm. High temperature X-ray diffraction patterns showed that the expansion of the lattice with increasing temperature was less than that of the undoped crystal. The transmittance of the as-grown crystal was measured. It increased by 80% from the cutoff wavelength 380run to 450urn. The transmittance for 404rim was 50%, which is larger than that of the undoped crystals. The frequency-doubling property of KLN crystal was analyzed. Preliminary frequency doubling experiments showed that the crystal could generate blue light of 404nm through noncritical phase matching (NCPM) second harmonic generation (SHG) using a 808nm diode laser at room temperature.