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全固态紫外激光器以其体积小、寿命长、效率高、光束质量好、调谐范围宽、谱线窄等优点,广泛应用于机械探伤、光刻、微加工和医学等领域,等,利用大功率近红外相干光源作为基于非线性调谐技术的基频源,通过多级变频产生紫外相干辐射被认为是发展紫外相干光源的重要途径。紫外相干光源的关键问题是研制紫外波段的非线性光学变频晶体。非线性光学晶体是实现频率变换的条件之一,因此对非线性光学晶体的生长、尺寸、损伤电阻、转换效率和允许的参数范围提出了越来越高的要求。
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the simplest non-linear crystal which generates ultraviolet harmonics with the Nd:YAG elementary laser wavelength. So as to enrich the hurt threshold, lower CLBO surface area roughness, by extremely-precision machining, is required. Because the CLBO crystal has straightforward hydroscopic response and micro scratches in machining, ultra-precise machining of your CLBO crystal is often a hard specialized problem.
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The conversion effectiveness from fundamental NIR to DUV is from 5% to 36% in accordance with the noted brings about Table 1. Escalating the conversion efficiency will lessen the burden on the design and setup of the basic laser amplifier together with the electric energy usage. An excellent beam good quality of the elemental laser will likely add into the expanding with the conversion effectiveness along with the appropriate power depth from the NIR and environmentally read more friendly laser from the SHG and FHG approach, respectively. The highest conversion efficiencies from NIR to inexperienced and eco-friendly to DUV laser by usage of CLBO crystal are 70% and close to fifty%, respectively [12], which corresponds to the conversion effectiveness of 35% from fundamental to DUV.
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