Nonetheless, so that you can course of action the crystal is incredibly Sophisticated producing strategies are required. Considering that the dawn of this crystal, focusing on this obstacle, we are now the sole corporation on earth that could be processed Within this crystal.
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We summarized The present development status in the significant-power DUV laser the two in the wavelength of FHG of the 1-μm laser and at 193 nm. The recent growth of the reliable-point out/fiber laser, plus the nonlinear optical crystals, prompts not merely the typical electric power but also the beam top quality (coherence) with the DUV lasers to an unparalleled amount.
The normal electricity from the NIR laser however has the probable to get enhanced to tens of watts including 70 W [26] When the double-go configuration could possibly be used for your Yb:YAG SCF amplifier phase. Consequently, Should the conversion effectiveness of 31% from NIR to DUV may be nonetheless managed at this bigger electricity ailment, the typical output electric power of the DUV laser at 258 nm could possibly be much more than twenty W, which might be a amazing energy degree for that DUV laser and bring on the unanticipated DUV laser machining success. Moreover, for top-ability DUV laser, the UV destruction of your nonlinear crystal, such as the windows for CLBO crystal and also the mirrors, is yet another vital parameter for long-lasting and secure operation.
On the flip side, the beam quality of the better ability DUV laser would come to be even worse as a consequence of more severe thermal and nonlinear effects. Therefore, the frequency conversion processes should be diligently created to mitigate the aforementioned outcomes. So, a high-energy DUV laser in the FHG of 1 μm with a great beam top quality could possibly be acquired and will be beneficial for getting the shorter wavelength DUV lasers for instance 193 nm by SFG.
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During the scientific and industrial purposes, the beam top quality on the DUV laser is additionally a very important parameter. Notably, the beam good quality on the DUV laser significantly influences the laser machining effects. The beam top quality in the DUV laser is determined by that of the fundamental laser plus the crystal to the frequency conversion. Not too long ago, a high-ability DUV laser (>ten W) at 258 nm was noted by using a beam good quality of M2 < 1.5, which was created by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would result in an even better laser machining final result in comparison to the prior DUV lasers with greater M2.
The heartbeat period of the second Stokes mild was shortened to five ns as shown in Figure 7a, a single-shot image within the oscilloscope, which can be a typical phenomenon in Raman laser [forty four] while the pulse length with the pump laser was ten ns.
What's more, combining the strong-condition laser with other nonlinear course of action which include stimulated Raman scattering, NIR lasers might be attained at new wavelengths with substantial electric power and significant beam good quality, which was analyzed from the evidence-of-theory experiment. This Raman laser scheme presents a completely new path to the substantial-electricity DUV laser, Specially on the wavelength of 193 nm.
The beam profile shown in Determine 7b shown a very good beam high-quality as among the list of deserves of Raman laser, which would be helpful to create a 193-nm DUV laser with a high quality beam.
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