All-sound-condition ultraviolet lasers are already broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of compact quantity, extensive life, superior performance, very good beam top quality, broad tuning and slender spectral line, and many others. Employing significant electric power around-infrared coherent light resource as the fundamental frequency resource determined by nonlinear tuning engineering, creating ultraviolet coherent radiation by multistage frequency conversion is thought to be a significant approach to build the ultraviolet coherent light resource.
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The typical energy in the NIR laser continue to has the opportunity to be enhanced to tens of watts like 70 W [26] If your double-move configuration may be used for your Yb:YAG SCF amplifier phase. Hence, In case the conversion performance of 31% from NIR to DUV could be nonetheless taken care of at this increased electric power ailment, the average output power from the DUV laser at 258 nm could possibly be more than twenty W, which might certainly be a remarkable power amount for that DUV laser and cause the unanticipated DUV laser machining benefits. In addition, for high-ability DUV laser, the UV hurt on the nonlinear crystal, including the windows for CLBO crystal along with the mirrors, is another significant parameter for long run and secure operation.
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LBO can be an excellent nonlinear crystal which is always applied to the SHG through the NIR to the eco-friendly. The DUV laser is usually recognized by two phases of SFG within the LBO crystals considering that there is no phase-matching angle for LBO to transform the green laser at 515 nm or 532 nm to the DUV directly by SHG [sixteen]. A short while ago, the NSBBF crystal has also revealed its opportunity to get a substantial conversion effectiveness from 532 nm to 266 nm. The walk-off angle and deff in the NSBBF are Virtually similar to those of CLBO [seventeen].
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The heart beat duration of the next Stokes mild was shortened to 5 ns as demonstrated in Determine 7a, a single-shot picture from the oscilloscope, which happens to be a typical phenomenon in Raman laser [44] whilst the pulse period in the pump laser was ten ns.
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The beam profile proven in Figure 7b demonstrated a great beam top quality as one of several merits of Raman laser, which would be effective to crank out a 193-nm DUV laser with a top quality beam.
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