All-good-point out ultraviolet lasers are already commonly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the advantages of tiny volume, prolonged lifetime, significant effectiveness, excellent beam high quality, wide tuning and slender spectral line, and many others. Using substantial energy around-infrared coherent gentle source as the fundamental frequency source according to nonlinear tuning engineering, producing ultraviolet coherent radiation by multistage frequency conversion is considered a crucial technique to create the ultraviolet coherent mild source.
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We summarized The present advancement position on the higher-ability DUV laser equally at the wavelength of FHG in the 1-μm laser and at 193 nm. The current enhancement on the stable-point out/fiber laser, plus the nonlinear optical crystals, prompts not only the typical electric power but also the beam top quality (coherence) from the DUV lasers to an unprecedented degree.
The real key problem of ultraviolet coherent light source primarily focuses on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is among the circumstances for frequency transformation, so the growth, dimensions, injury resistance, conversion performance and allowable parameter range of nonlinear optical crystal are required A lot more.
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Both the 1040 nm and 1078 nm laser originate from one particular dual-wavelength Yb-doped fiber laser. Each and every laser is amplified by stages of fiber amplifier and Yb-doped elements amplifier, respectively.
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During the scientific and industrial purposes, the beam high-quality of your DUV laser is usually a very important parameter. Specially, the beam top quality of the DUV laser dramatically influences the laser machining final results. The beam quality of your DUV laser is set by that of the elemental laser along with the crystal for your frequency conversion. Recently, a substantial-electrical power DUV laser (>ten W) at 258 nm was reported by using a beam quality of M2 < 1.5, which was created by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would lead to an improved laser machining final result in comparison with the past DUV lasers with larger 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 elementary laser wavelength. So as to improve the destruction threshold, small CLBO floor roughness, by ultra-precision machining, is necessary. Since the CLBO crystal has straightforward hydroscopic reaction and micro scratches in machining, extremely-precise machining of your CLBO crystal is often a difficult complex trouble.
Tunable ultraviolet laser supply determined by reliable-condition dye laser technological innovation and CsLiB6O10 harmonic era
The conversion effectiveness from fundamental NIR to DUV is from 5% to 36% in accordance with the reported results in Desk one. Escalating the conversion performance will reduce the load on the look and setup of the fundamental laser amplifier and also the electric electric power consumption. An excellent beam excellent of the elemental laser may also lead into the growing on the conversion effectiveness and the right power depth of the NIR and green laser within the SHG and FHG method, respectively. The highest conversion efficiencies from NIR to green and environmentally friendly to DUV laser by usage of CLBO crystal are 70% and all over fifty%, respectively [12], which corresponds towards the conversion performance of 35% from essential to DUV.
The development of your 193-nm laser was demonstrated by phases of SFG. In order to scale the DUV laser electrical power correctly, a fresh strategy from the 193-nm DUV laser technology is introduced according to the diamond Raman laser.