All-stable-state ultraviolet lasers are actually broadly Employed in the fields of mechanical flaw detection, lithography, micromachining and medicine for some great benefits of tiny quantity, prolonged lifestyle, higher efficiency, excellent beam top quality, wide tuning and slender spectral line, and so forth. Utilizing significant power around-infrared coherent light source as the fundamental frequency supply determined by nonlinear tuning know-how, creating ultraviolet coherent radiation by multistage frequency conversion is considered a very important solution to produce the ultraviolet coherent light supply.
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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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On the opposite facet, the power scaling with the NIR laser is another facet to enhance the regular power in the 193-nm DUV laser. Due to the insufficient the substantial-power amplification Resolution of your NIR laser (as an example at 1553 nm), nonlinear frequency processes including optical parameter oscillation (OPO) may very well be placed on develop a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength and getting relative larger energy [21]. Recently, a diamond Raman laser showed its skill in accomplishing a higher electrical power plus a substantial conversion efficiency within the 1st Stokes with the one-μm laser [22,23], which suggests the possibility being applied within the 193-nm DUV laser technology because of its large Raman get and large frequency change.
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During the scientific and industrial apps, the beam top quality on the DUV laser is usually a very important parameter. Especially, the beam top quality from the DUV laser considerably affects the laser machining final results. The beam quality from the DUV laser is decided by that of the fundamental laser along with the crystal for that frequency conversion. Just lately, a large-electrical power DUV laser (>10 W) at 258 nm was described by using a beam excellent of M2 < one.5, which was generated by FHG of the Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would result in an improved laser machining final result in comparison to the past DUV lasers with much larger M2.
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Moreover, combining the sound-condition laser with other nonlinear course of action for example stimulated Raman scattering, NIR lasers can be realized at new wavelengths with significant electricity website and higher beam high-quality, which was analyzed with the evidence-of-basic principle experiment. This Raman laser scheme presents a whole new route to the high-electrical power DUV laser, Particularly on the wavelength of 193 nm.
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