All-good-point out ultraviolet lasers happen to be broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of modest volume, extended existence, large efficiency, superior beam high-quality, huge tuning and slender spectral line, etcetera. Employing high power in the vicinity of-infrared coherent light-weight supply as the fundamental frequency resource based upon nonlinear tuning technological innovation, generating ultraviolet coherent radiation by multistage frequency conversion is considered to be a vital way to produce the ultraviolet coherent light-weight source.
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We summarized the current development position in the higher-ability DUV laser equally in the wavelength of FHG of your 1-μm laser and at 193 nm. The the latest progress of the stable-point out/fiber laser, and also the nonlinear optical crystals, prompts not simply the typical ability but additionally the beam good quality (coherence) of the DUV lasers to an unprecedented degree.
The normal electric power with the NIR laser continue to has the opportunity for being improved to tens of watts such as 70 W [26] Should the double-move configuration might be used for the Yb:YAG SCF amplifier phase. Therefore, If your conversion efficiency of 31% from NIR to DUV may very well be nevertheless managed at this larger electric power issue, the average output electric power of your DUV laser at 258 nm may be more than 20 W, which might be a amazing power level for your DUV laser and bring on 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 and also the mirrors, is another important parameter for long-lasting and steady operation.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear crystal which generates ultraviolet harmonics in the Nd:YAG basic laser wavelength. In an effort to increase CLBO Crystal the hurt threshold, minimal CLBO surface roughness, by extremely-precision machining, is required. Because the CLBO crystal has easy hydroscopic reaction and micro scratches in machining, ultra-specific machining with the CLBO crystal is often a hard specialized problem.
The beam profile shown in Figure 7b demonstrated a fantastic beam quality as on the list of merits of Raman laser, which would be advantageous to create a 193-nm DUV laser with a high quality beam.
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