All-good-point out ultraviolet lasers are greatly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of modest volume, lengthy lifestyle, high performance, very good beam excellent, vast tuning and narrow spectral line, etc. Employing substantial energy in the vicinity of-infrared coherent gentle supply as the elemental frequency supply according to nonlinear tuning engineering, building ultraviolet coherent radiation by multistage frequency conversion is considered an important technique to develop the ultraviolet coherent mild resource.
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The normal electricity in the NIR laser nonetheless has the potential being improved to tens of watts such as 70 W [26] When the double-pass configuration may very well be utilized for your Yb:YAG SCF amplifier phase. Therefore, Should the conversion efficiency of 31% from NIR to DUV may very well be nonetheless preserved at this higher ability problem, the average output electric power of the DUV laser at 258 nm could possibly be in excess of twenty W, which might be a exceptional electricity stage for your DUV laser and cause the unanticipated DUV laser machining final results. Furthermore, for prime-ability DUV laser, the UV damage of the nonlinear crystal, including the Home windows for CLBO crystal along with the mirrors, is another important parameter for long-lasting and secure operation.
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While in the scientific and industrial programs, the beam top quality in the DUV laser can also be an essential parameter. Especially, the beam quality of your DUV laser considerably impacts the laser machining results. The beam excellent in the DUV laser is determined by that of the elemental laser as well as the crystal with the frequency conversion. Recently, a significant-energy DUV laser (>ten W) at 258 nm was reported using a beam high-quality of M2 < 1.5, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would cause a far better laser machining outcome as compared to the prior DUV lasers with more substantial M2.
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Furthermore, combining the good-state laser with other nonlinear method which include stimulated Raman scattering, NIR lasers might be reached at new wavelengths with superior energy and large beam excellent, which was analyzed via the evidence-of-basic principle experiment. This Raman laser plan presents a brand new route to the higher-electrical power DUV laser, click here Specially with the wavelength of 193 nm.
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