5 Simple Statements About CLBO Crystal Explained
5 Simple Statements About CLBO Crystal Explained
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All-sound-state ultraviolet lasers are extensively used in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of little quantity, prolonged lifetime, significant performance, great beam quality, large tuning and slim spectral line, and so on. Using substantial electricity close to-infrared coherent light-weight supply as the elemental frequency resource determined by nonlinear tuning know-how, making ultraviolet coherent radiation by multistage frequency conversion is considered to be an important technique to build the ultraviolet coherent light-weight 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 bigger electric power DUV laser would turn into even worse on account of a lot more serious thermal and nonlinear consequences. Therefore, the frequency conversion processes really should be carefully created to mitigate the aforementioned results. Consequently, a superior-electric power DUV laser at the FHG of 1 μm with a great beam good quality may very well be attained and can be useful for obtaining the shorter wavelength DUV lasers like 193 nm by SFG.
LBO is also a superb nonlinear crystal which is often applied to the SHG through the NIR to the green. The DUV laser will likely be realized by two phases of SFG while in the LBO crystals due to the fact there is absolutely no period-matching angle for LBO to transform the green laser at 515 nm or 532 nm towards the DUV right by SHG [16]. Not too long ago, the NSBBF crystal has also shown its probable to acquire a higher conversion efficiency from 532 nm to 266 nm. The walk-off angle and deff from the NSBBF are Pretty much similar to those of CLBO [seventeen].
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Within the scientific and industrial applications, the beam quality of the DUV laser can also be an essential parameter. Especially, the beam quality of your DUV laser radically influences the laser machining results. The beam high-quality of your DUV laser is determined by that of the basic laser as well as the crystal for your frequency conversion. Lately, a superior-electricity DUV laser (>10 W) at 258 nm was described having a beam high-quality of M2 < 1.five, which was created by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [thirteen]. This laser would result in an even better laser machining final result when compared with the preceding DUV lasers with larger sized M2.
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The conversion performance from elementary NIR to DUV is from 5% to 36% in accordance with the documented results in Desk 1. Raising the conversion efficiency will lessen the load on the design and set up of the elemental laser amplifier together with the electric electricity use. An excellent beam excellent of the fundamental laser may even add towards the rising of your conversion performance and also the suitable electric power depth of your NIR and green laser within the SHG and FHG method, respectively. The very best conversion efficiencies from NIR to eco-friendly and eco-friendly to DUV laser by usage of CLBO crystal are 70% and close to 50%, respectively [12], which corresponds on the conversion effectiveness of 35% from fundamental to DUV.
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