CLBO Crystal Fundamentals Explained
CLBO Crystal Fundamentals Explained
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All-good-point out ultraviolet lasers have been greatly Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for the advantages of tiny volume, lengthy lifetime, significant efficiency, good beam excellent, huge tuning and slim spectral line, etc. Employing significant energy near-infrared coherent light-weight supply as the basic frequency source based on nonlinear tuning know-how, producing ultraviolet coherent radiation by multistage frequency conversion is thought to be a vital approach to build the ultraviolet coherent gentle resource.
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Based on the evidence-of-principle experiment, the conversion performance of 23% implied the potential for attaining significant-electricity at the 2nd Stokes wavelength with the Raman laser. When the pump laser of 1078 nm may be attained at the standard energy of fifty W, the output ability of its 2nd Stokes wavelength at 1512 nm can be more than 10 W. The look of your Raman laser cavity needs to be optimized to be able to avoid the harm with the M1 and diamond surface.
As an illustration, The present concave OC could get replaced by a airplane mirror which could mitigate the power density on the surface area of M1 as well as the diamond. Additionally, applying substantial injury threshold coatings for M1 and diamond would also Increase the output electrical power with none damages. Then, the NIR laser with the 2nd Stokes wavelength might be higher sufficient, in addition to its very good beam top quality, to produce the final DUV laser at 193 nm that has a large normal power.
Conversely, the beam excellent of the higher energy DUV laser would grow to be worse on account of a lot more critical thermal and nonlinear results. Therefore, the frequency conversion processes should be meticulously built to mitigate the aforementioned results. Therefore, a higher-power DUV laser for the FHG of 1 μm with a very good beam top quality may very well be obtained and may be beneficial for acquiring the shorter wavelength DUV lasers like 193 nm by SFG.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear crystal which generates ultraviolet harmonics of the Nd:YAG basic laser wavelength. So that you can increase the hurt threshold, very low CLBO surface area roughness, by ultra-precision machining, is necessary. As the CLBO crystal has quick hydroscopic response and micro scratches in machining, ultra-exact machining on the CLBO crystal is usually a hard specialized problem.
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The conversion performance from basic NIR to DUV is from 5% to 36% based on the reported ends in Desk one. Escalating the conversion effectiveness will reduce the load on the look and setup of the elemental laser amplifier in addition to the electric ability consumption. A great beam high-quality of the elemental laser can even contribute for the growing with the conversion efficiency in addition to the suitable ability intensity in the NIR and eco-friendly laser inside the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to environmentally friendly and environmentally friendly to DUV laser by usage of CLBO crystal are 70% and all around 50%, respectively [twelve], which corresponds on the conversion efficiency of 35% from essential to DUV.
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