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硝酸(钅兰)钾[K_2La(NO_3)_5·2H_2O],简称KLN,是近年来新发现的非线性光学晶体,属正交晶系,mm2点群.透光波段为0.33～2.35μm.它的非线性系数是KDP晶体的3倍,在室温下对1.06μm和0.95μm激光可实现非临界位相匹配,而且其在一定波长范围内实现频率转换的阈值功率(λβ_θ/d_(eff))~2比KNbO_3、LBO等都低.它虽含有结晶水、易潮解,但可通过涂高聚物保护膜防止潮解和脱水,因而它是一种有应用前景的、可产生蓝绿光的新的频率转换材料,已引起人们的重视.为了进一步研究该类材料的特性,我们培育出了掺钕的KLN晶体(KLNN).在此我们将首次报道KLNN的生长特性、光谱及其他有关的性质.
K 2 La (NO_3) _5 · 2H_2O], referred to as KLN, is a newly discovered nonlinear optical crystal in recent years, belonging to the orthorhombic system with a group of mm2. The transmission band of light is 0.33 ~ 2.35 μm. The nonlinear coefficient of KDP crystal is 3 times that of KDP crystal, which can achieve non-critical phase matching for 1.06μm and 0.95μm lasers at room temperature, and it achieves the threshold power (λβ_θ / d eff) of frequency conversion in a certain wavelength range 2 is lower than KNbO_3 and LBO etc. Although it contains crystal water and is easily deliquescent, it can prevent deliquescence and dehydration by coating the polymer protective film, so it is a promising new frequency conversion that produces blue-green light Material, has attracted people’s attention.In order to further study the properties of this kind of material, we have produced neodymium-doped KLN crystal (KLNN), and we will first report the growth characteristics, spectra and other related properties of KLNN.