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利用波导型准相位匹配周期极化反转铌酸锂(PPLN)晶体直接倍频波长为976nm的连续半导体激光二极管,在 接近室温的晶体工作温度(28℃)下,获得了488nm的连续蓝光输出,最大输出大于20mW。所用的晶体尺寸为8mm× 1．4mm×1mm,波导截面为4．5μm×3．5μm,极化周期为5．2μm。研究了波导型PPLN晶体的倍频效率与温度的关系。
The continuous blue laser output of 488nm was obtained at the operating temperature of the crystal near room temperature (28 ℃) by using a continuous semiconductor laser diode with waveguide-type quasi-phase-matching periodic polarization inversion lithium niobate (PPLN) crystal with direct wavelength of 976nm. , The maximum output is greater than 20mW. The crystal size used was 8 mm × 1.4 mm × 1 mm, the waveguide cross section was 4.5 μm × 3.5 μm and the polarization period was 5.2 μm. The relationship between frequency doubling efficiency and temperature of waveguide PPLN crystal was studied.