All-solid-state ultraviolet lasers happen to be greatly used in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of tiny quantity, long daily life, superior effectiveness, very good beam top quality, broad tuning and slender spectral line, and many others. Using superior electric power in the vicinity of-infrared coherent light supply as the elemental frequency source based upon nonlinear tuning engineering, generating ultraviolet coherent radiation by multistage frequency conversion is thought to be a vital technique to create the ultraviolet coherent gentle supply.
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The true secret problem of ultraviolet coherent light-weight source mainly concentrates on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is probably the circumstances for frequency transformation, so the growth, measurement, damage resistance, conversion effectiveness and allowable parameter selection of nonlinear optical crystal are required A lot more.
However, the beam high-quality of this better energy DUV laser would come to be worse resulting from more critical thermal and nonlinear consequences. Therefore, the frequency conversion procedures need to be very carefully meant to mitigate the aforementioned effects. As a result, a superior-energy DUV laser with the FHG of one μm with a very good beam quality could possibly be attained and can be valuable for acquiring the shorter wavelength DUV lasers for example 193 nm by SFG.
Both equally the 1040 nm and 1078 nm laser come from a single dual-wavelength Yb-doped fiber laser. Each laser is amplified by levels of more info fiber amplifier and Yb-doped elements amplifier, respectively.
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In the scientific and industrial applications, the beam high quality of the DUV laser is likewise a significant parameter. Specifically, the beam quality with the DUV laser drastically influences the laser machining final results. The beam high quality with the DUV laser is determined by that of the basic laser along with the crystal for the frequency conversion. Just lately, a high-energy DUV laser (>10 W) at 258 nm was claimed 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 lead to a much better laser machining final result in comparison to the preceding DUV lasers with larger sized M2.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear crystal which generates ultraviolet harmonics on the Nd:YAG basic laser wavelength. In order to boost the problems threshold, lower CLBO floor roughness, by ultra-precision machining, is needed. As the CLBO crystal has effortless hydroscopic reaction and micro scratches in machining, extremely-precise machining of your CLBO crystal can be a tough technical issue.
Tunable ultraviolet laser source depending on strong-condition dye laser technology and CsLiB6O10 harmonic generation
The conversion effectiveness from fundamental NIR to DUV is from five% to 36% according to the described leads to Desk 1. Increasing the conversion performance will reduce the stress on the design and setup of the elemental laser amplifier in addition to the electric powered energy intake. A good beam good quality of the elemental laser will also contribute to your increasing in the conversion effectiveness together with the suitable electric power depth of your NIR and environmentally friendly laser inside the SHG and FHG process, respectively. The highest conversion efficiencies from NIR to green and eco-friendly to DUV laser by utilization of CLBO crystal are 70% and all around fifty%, respectively [twelve], which corresponds for the conversion efficiency of 35% from elementary to DUV.
The event with the 193-nm laser was demonstrated by phases of SFG. So as to scale the DUV laser ability efficiently, a brand new notion of your 193-nm DUV laser generation is presented determined by the diamond Raman laser.