All-strong-point out ultraviolet lasers have been widely used in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of compact volume, extended lifetime, significant effectiveness, excellent beam good quality, large tuning and slim spectral line, and so on. Employing significant electricity close to-infrared coherent light-weight supply as the elemental frequency resource based upon nonlinear tuning engineering, producing ultraviolet coherent radiation by multistage frequency conversion is viewed as a significant strategy to create the ultraviolet coherent gentle supply.
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The normal energy from the NIR laser nonetheless has the opportunity to get improved to tens of watts such as 70 W [26] if the double-pass configuration may very well be used with the Yb:YAG SCF amplifier phase. For this reason, if the conversion efficiency of 31% from NIR to DUV could be continue to preserved at this bigger power problem, the common output electricity on the DUV laser at 258 nm may very well be over 20 W, which might certainly be a extraordinary energy amount for the DUV laser and cause the unanticipated DUV laser machining success. Furthermore, for high-electrical power DUV laser, the UV hurt on the nonlinear crystal, including the windows for CLBO crystal as well as mirrors, is yet another vital parameter for long run and steady operation.
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As a result of thermal lens influence within the stable-state lasers, if the heating administration is insufficient, It's not quick to get the stable-point out laser having a high power and a substantial beam good quality simultaneously. Recently, with the event of The skinny disk laser and solitary-crystal fiber (SCF) laser, a higher-electricity laser at the elemental wavelength (one μm) were realized with a very good beam high quality In spite of a TEM00 mode beam [four,24], which would be great candidates for the elemental from the DUV laser technology. One more prospect for the fundamental could be the large-electrical power fiber laser which may very well be reached by coherent beam blend with M2 value less than 1.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the simplest non-linear crystal which generates ultraviolet harmonics with the Nd:YAG basic laser wavelength. As a way to increase the hurt threshold, low CLBO floor roughness, by ultra-precision machining, is needed. As the CLBO crystal has effortless hydroscopic reaction and micro scratches in machining, extremely-specific machining of the more info CLBO crystal is actually a tough technical problem.
The beam profile revealed in Figure 7b demonstrated an excellent beam excellent as one of many merits of Raman laser, which would be valuable to make a 193-nm DUV laser with a high quality beam.
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The event from the 193-nm laser was demonstrated by stages of SFG. So as to scale the DUV laser electrical power efficiently, a whole new thought of the 193-nm DUV laser era is introduced according to the diamond Raman laser.