All-reliable-point out ultraviolet lasers are already extensively used in the fields of mechanical flaw detection, lithography, micromachining and medication for some great benefits of modest volume, extended existence, significant performance, great beam good quality, vast tuning and slim spectral line, etcetera. Employing large energy in close proximity to-infrared coherent mild source as the fundamental frequency resource based upon nonlinear tuning technology, creating ultraviolet coherent radiation by multistage frequency conversion is viewed as a significant technique to produce the ultraviolet coherent mild resource.

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By way of example, the current concave OC could get replaced by a plane mirror which could mitigate the ability density around the area of M1 as well as the diamond. Moreover, employing higher injury threshold coatings for M1 and diamond would also Enhance the output electrical power with none damages. Then, the NIR laser on the 2nd Stokes wavelength may very well be high sufficient, and also its fantastic beam high-quality, to generate the final DUV laser at 193 nm with a higher ordinary power.

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Inside the scientific and industrial programs, the beam high quality from the DUV laser is likewise a very important parameter. Particularly, the beam high-quality with the DUV laser substantially has an effect on the laser machining effects. The beam quality with the DUV laser is set by that of the fundamental laser as well as crystal for that frequency conversion. Not too long ago, a high-ability DUV laser (>10 W) at 258 nm was claimed with a beam high quality of M2 < 1.5, which was produced by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would cause a better laser machining outcome as compared to the prior DUV lasers with more substantial M2.

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The beam profile proven in Figure 7b demonstrated a superb beam excellent as on the list of deserves of Raman laser, which would be helpful to produce a 193-nm DUV laser with a high quality beam.

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