All-strong-condition ultraviolet lasers are already commonly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of tiny volume, very long lifetime, large performance, excellent beam high-quality, broad tuning and slim spectral line, and many others. Using significant energy in close proximity to-infrared coherent light-weight source as the fundamental frequency source according to nonlinear tuning technological know-how, creating ultraviolet coherent radiation by multistage frequency conversion is regarded as a significant way to establish the ultraviolet coherent gentle resource.

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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。

However, the beam high-quality of this greater ability DUV laser would turn into even worse because of additional major thermal and nonlinear consequences. That's why, the frequency conversion procedures ought to be thoroughly designed to mitigate the aforementioned results. Thus, a substantial-ability DUV laser in the FHG of 1 μm with a great beam top quality may be received and can be helpful for obtaining the shorter wavelength DUV lasers such as 193 nm by SFG.

LBO is additionally a wonderful nonlinear crystal which is always placed on the SHG from the NIR towards the green. The DUV laser is normally realized by two phases of SFG within the LBO crystals given that there is not any section-matching angle for LBO to transform the environmentally friendly laser at 515 nm or 532 nm on the DUV straight by SHG [sixteen]. Recently, the NSBBF crystal has also shown its possible to obtain a significant conversion efficiency from 532 nm to 266 nm. The walk-off angle and deff of the NSBBF are Nearly similar to those of CLBO [seventeen].

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Inside the scientific and industrial applications, the beam good quality with the DUV laser is additionally a significant parameter. Particularly, the beam quality on the DUV laser dramatically influences the laser machining results. The beam good quality with the DUV laser is determined by that of the basic laser and also the crystal for that frequency conversion. Not too long ago, a high-electricity DUV laser (>ten W) at 258 nm was noted that has a beam quality of M2 < 1.5, which was produced by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would bring on a greater laser machining consequence in comparison to the past DUV lasers with larger M2.

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