On the other hand, to be able to system the crystal may be very Sophisticated manufacturing tactics are required. Because the dawn of the crystal, working on this challenge, we are now the one organization on the globe which might be processed On this crystal.
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We summarized The existing improvement position on the higher-electrical power DUV laser equally within the wavelength of FHG from the one-μm laser and at 193 nm. The modern improvement from the strong-point out/fiber laser, plus the nonlinear optical crystals, prompts not merely the common energy but will also the beam high-quality (coherence) on the DUV lasers to an unprecedented degree.
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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Equally the 1040 nm and 1078 nm laser come from one twin-wavelength Yb-doped fiber laser. Each and every laser is amplified by stages of fiber amplifier and Yb-doped components amplifier, respectively.
On one other facet, the facility scaling with the NIR laser is another factor to enhance the typical electricity from the 193-nm DUV laser. As a result of lack of the superior-ability amplification Answer on the NIR laser (for instance at 1553 nm), nonlinear frequency processes including optical parameter oscillation (OPO) might be placed on make a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength in addition to acquiring relative better electricity [21]. A short while ago, a diamond Raman laser showed its potential in obtaining a higher electricity plus a superior conversion performance for the 1st Stokes with the one-μm laser [22,23], which more info suggests the chance to generally be applied from the 193-nm DUV laser era as a result of its high Raman obtain and enormous frequency shift.
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While in the scientific and industrial purposes, the beam top quality from the DUV laser is also an important parameter. Specifically, the beam high quality on the DUV laser radically affects the laser machining outcomes. The beam top quality on the DUV laser is set by that of the fundamental laser as well as crystal to the frequency conversion. A short while ago, a high-electrical power DUV laser (>10 W) at 258 nm was documented with a beam excellent of M2 < one.5, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would result in an improved laser machining outcome when compared with the preceding DUV lasers with greater M2.
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Furthermore, combining the strong-point out laser with other nonlinear procedure including stimulated Raman scattering, NIR lasers may be accomplished at new wavelengths with large electricity and superior beam excellent, which was tested from the evidence-of-basic principle experiment. This Raman laser plan delivers a fresh path to the higher-ability DUV laser, Specially in the wavelength of 193 nm.
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The conversion performance from basic NIR to DUV is from five% to 36% according to the reported leads to Desk 1. Expanding the conversion effectiveness will reduce the load on the look and set up of the fundamental laser amplifier and also the electrical power usage. A superb beam high quality of the basic laser may also lead to the growing in the conversion performance and also the suitable electricity depth of the NIR and green laser while in the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to environmentally friendly and green to DUV laser by use of CLBO crystal are 70% and all-around fifty%, respectively [12], which corresponds for the conversion efficiency of 35% from basic to DUV.
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