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感应炉生长的 Nd:YAG 单晶,其吸收光谱基本上是 Nd 在 YAG 中的本征吸收谱,一般不需要热处理,就可制作激光棒。石墨电阻炉生长的 Nd:YAG 的吸收光谱附加了4500埃宽为1000埃、3700埃宽为500埃及3300埃至2400埃的倾斜吸收带,因而必须经热处理(退火),才能制作激光棒。将感应炉晶体的激光棒及光谱样品,经900℃～1500℃热处理,得到激光棒的脉冲激光效率提高20～70%(一般为40%),连续激光效率提高30%的结果,而样品的吸收光谱和散射颗粒在处理前后没有变化。只能认为 Nd:YAG 在热处理前因缺氧,以致激光效率偏低。更
Induction furnace growth Nd: YAG single crystal, the absorption spectrum is essentially the intrinsic absorption spectrum of Nd in YAG, generally do not need heat treatment, you can make laser rods. Absorption spectra of Nd: YAG grown in a graphite resistance furnace add 4500 angstroms of angled absorption at 1000 angstroms wide and 3700 angstroms wide at 3300 angstroms to 2400 angstroms at 500 angstroms and therefore must be heat treated (annealed) to produce a laser rod. The laser rod and spectral samples of induction furnace crystal were heat-treated at 900 ℃ ~ 1500 ℃, the pulse laser efficiency of the laser rod increased by 20 ~ 70% (usually 40%) and the continuous laser efficiency increased by 30% Absorption spectra and scattering particles did not change before and after treatment. Nd: YAG can only be considered because of lack of oxygen before heat treatment, resulting in low laser efficiency. more