All-good-state ultraviolet lasers are already commonly Employed in the fields of mechanical flaw detection, lithography, micromachining and medication for the advantages of little volume, lengthy daily life, substantial effectiveness, great beam excellent, huge tuning and slim spectral line, etc. Employing substantial electrical power in close proximity to-infrared coherent mild resource as the basic frequency resource determined by nonlinear tuning technological innovation, generating ultraviolet coherent radiation by multistage frequency conversion is thought to be an essential solution to create the ultraviolet coherent light-weight supply.
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By way of example, The present concave OC could be replaced by a aircraft mirror which could mitigate the power density about the surface of M1 and also the diamond. Also, applying large hurt threshold coatings for M1 and diamond would also Increase the output electrical power with none damages. Then, the NIR laser for the 2nd Stokes wavelength may very well be superior plenty of, in addition to its very good beam high quality, to crank out the final DUV laser at 193 nm with a substantial regular ability.
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Both of those the 1040 nm and 1078 nm laser come from 1 twin-wavelength Yb-doped fiber laser. Each and every laser is check here amplified by levels of fiber amplifier and Yb-doped resources amplifier, respectively.
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Within the scientific and industrial programs, the beam quality with the DUV laser is also a crucial parameter. Specifically, the beam high-quality of the DUV laser substantially affects the laser machining final results. The beam top quality of the DUV laser is determined by that of the fundamental laser and also the crystal with the frequency conversion. Not too long ago, a large-electricity DUV laser (>10 W) at 258 nm was described which has a beam high quality of M2 < 1.5, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would lead to a much better laser machining consequence in comparison to the earlier DUV lasers with much larger M2.
The pulse length of the 2nd Stokes mild was shortened to five ns as demonstrated in Determine 7a, an individual-shot photo in the oscilloscope, and that is a common phenomenon in Raman laser [44] even though the heart beat duration of the pump laser was ten ns.
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The beam profile demonstrated in Determine 7b demonstrated a superb beam excellent as on the list of deserves of Raman laser, which might be useful to make a 193-nm DUV laser with a high quality beam.
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The event of your 193-nm laser was demonstrated by phases of SFG. In order to scale the DUV laser electric power successfully, a different idea with the 193-nm DUV laser generation is presented based upon the diamond Raman laser.