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The real key dilemma of ultraviolet coherent light source generally focuses on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is one of the disorders for frequency transformation, so the growth, measurement, destruction resistance, conversion efficiency and allowable parameter number of nonlinear optical crystal are needed Progressively more.
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In the scientific and industrial programs, the beam good quality with the DUV laser can also be a significant parameter. Especially, the beam good quality of your DUV laser significantly has an effect on the laser machining final results. The beam quality on the DUV laser is determined by that of the fundamental laser and the crystal with the frequency conversion. Not too long ago, a substantial-electric power DUV laser (>ten W) at 258 nm was documented which has a beam high-quality of M2 < one.5, which was produced by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would cause a far better laser machining end result in comparison to the earlier DUV lasers with larger M2.
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The beam profile revealed in Figure 7b shown a good beam excellent as one of several merits of Raman laser, which might be useful to make a 193-nm DUV laser with a high 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 twice as massive as that of KDP. CLBO crystals might be developed within the stoichiometric melt with reduce viscosity.
The event with the 193-nm laser was shown by phases of SFG. So as to scale the DUV laser electrical power successfully, a completely new principle with the 193-nm DUV laser technology is offered based on the diamond Raman laser.