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The common electric power of your NIR laser still has the potential being improved to tens of watts like 70 W [26] When the double-move configuration could possibly be used for the Yb:YAG SCF amplifier phase. Hence, If your conversion efficiency of 31% from NIR to DUV may very well be nonetheless preserved at this higher electrical power ailment, the normal output electrical power of your DUV laser at 258 nm can be a lot more than twenty W, which might be considered a amazing energy level for your DUV laser and bring on the unanticipated DUV laser machining success. Moreover, for high-power DUV laser, the UV injury in the nonlinear crystal, including the Home windows for CLBO crystal as well as mirrors, is yet another critical parameter for long run and steady Procedure.
Then again, the beam excellent of this better energy DUV laser would develop into even worse as a result of much more critical thermal and nonlinear consequences. Therefore, the frequency conversion processes must be thoroughly made to mitigate the aforementioned effects. Therefore, a substantial-ability DUV laser at the FHG of 1 μm with an excellent beam top quality may be received and can be useful for acquiring the shorter wavelength DUV lasers for example 193 nm by SFG.
Due to the thermal lens effect in the sound-state lasers, if the heating administration is insufficient, It isn't straightforward to get the good-condition laser with a substantial energy and also a higher beam excellent simultaneously. A short while ago, with the development of the thin disk laser and solitary-crystal fiber (SCF) laser, a superior-electricity laser at the basic wavelength (one μm) had been understood with an excellent beam quality Despite a TEM00 manner beam [4,24], which might be great candidates for the basic with the DUV laser era. A further candidate for the basic will be the significant-electricity fiber laser which may be reached by coherent beam blend with M2 value lower than one.
On one other aspect, the power scaling of your NIR laser is yet another facet to boost the average power with the 193-nm DUV laser. A result of the lack of the significant-power amplification Alternative with the NIR laser (as an example at 1553 nm), nonlinear frequency procedures for example optical parameter oscillation (OPO) could be applied to build a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength along with getting relative larger ability [21]. Lately, a diamond Raman laser showed its potential in acquiring a large electric power and a high conversion efficiency within the 1st Stokes of the one-μm laser [22,23], which means the chance being used from the 193-nm DUV laser era as a consequence of its significant Raman acquire and large frequency change.
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The beam profile proven in Figure 7b demonstrated a fantastic beam high-quality as among the merits of Raman laser, which would be advantageous to create a 193-nm DUV laser with a top quality beam.
Its UV absorption edge reaches a hundred and eighty nm. The productive nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about two times as big as that of KDP. CLBO crystals can be developed from your stoichiometric soften with decrease viscosity.
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