All-reliable-state ultraviolet lasers are already commonly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for some great benefits of small quantity, very long life, superior performance, very good beam quality, wide tuning and slender spectral line, etcetera. Employing large electrical power in close proximity to-infrared coherent light-weight supply as the basic frequency source based upon nonlinear tuning technological innovation, making ultraviolet coherent radiation by multistage frequency conversion is thought to be an important strategy to develop the ultraviolet coherent light-weight 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。
However, the beam excellent of this increased ability DUV laser would grow to be even worse as a result of much more major thermal and nonlinear results. Consequently, the frequency conversion procedures should be meticulously meant to mitigate the aforementioned results. As a result, a superior-energy DUV laser for the FHG of one μm with a good beam good quality could possibly be acquired and will be advantageous for getting the shorter wavelength DUV lasers which include 193 nm by SFG.
Both the 1040 nm and 1078 nm laser originate from just one dual-wavelength Yb-doped fiber laser. Every laser is amplified by phases of fiber amplifier and Yb-doped components amplifier, respectively.
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The beam profile shown in Determine 7b demonstrated a good beam top quality as among the deserves of Raman laser, which would be beneficial to crank out a 193-nm DUV laser with a high quality beam.
The conversion efficiency from fundamental NIR to DUV is from five% to 36% in accordance with the described ends in website Table 1. Increasing the conversion performance will decrease the load on the design and set up of the fundamental laser amplifier plus the electric powered ability use. A very good beam high quality of the elemental laser can even contribute to the raising in the conversion performance together with the appropriate electric power intensity with the NIR and green laser from the SHG and FHG method, respectively. The best conversion efficiencies from NIR to eco-friendly and inexperienced to DUV laser by usage of CLBO crystal are 70% and about fifty%, respectively [12], which corresponds to your conversion performance of 35% from fundamental to DUV.
The event from the 193-nm laser was shown by levels of SFG. In an effort to scale the DUV laser energy proficiently, a brand new strategy of the 193-nm DUV laser generation is offered dependant on the diamond Raman laser.