All-good-point out ultraviolet lasers have been widely Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of smaller quantity, prolonged lifetime, higher effectiveness, excellent beam good quality, extensive tuning and slim spectral line, and so forth. Making use of substantial electric power in close proximity to-infrared coherent mild resource as the fundamental frequency resource determined by nonlinear tuning know-how, making ultraviolet coherent radiation by multistage frequency conversion is viewed as an essential approach to establish the ultraviolet coherent light-weight supply.
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The standard electrical power in the NIR laser continue to has the potential to be enhanced to tens of watts for instance 70 W [26] If your double-move configuration could possibly be utilized with the Yb:YAG SCF amplifier stage. As a result, Should the conversion efficiency of 31% from NIR to DUV may very well be nevertheless managed at this higher electricity situation, the common output ability in the DUV laser at 258 nm may be greater than 20 W, which would certainly be a impressive electric power amount for your DUV laser and bring on the unanticipated DUV laser machining outcomes. Additionally, for top-electricity DUV laser, the UV problems with the nonlinear crystal, including the Home windows for CLBO crystal plus the mirrors, is another vital parameter for lasting and stable Procedure.
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LBO is usually a superb nonlinear crystal which is often placed on the SHG in the NIR to your environmentally friendly. The DUV laser is normally realized by two phases of CLBO Crystal SFG during the LBO crystals considering that there is not any phase-matching angle for LBO to convert the environmentally friendly laser at 515 nm or 532 nm for the DUV specifically by SHG [sixteen]. A short while ago, the NSBBF crystal has also proven its opportunity to obtain a large conversion efficiency from 532 nm to 266 nm. The walk-off angle and deff of the NSBBF are Nearly much like These of CLBO [17].
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The beam profile shown in Figure 7b demonstrated a fantastic beam high quality as one of several deserves of Raman laser, which might be advantageous to deliver a 193-nm DUV laser with a top quality beam.
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