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We summarized The existing improvement standing of your large-electric power DUV laser both on the wavelength of FHG of your one-μm laser and at 193 nm. The the latest improvement in the reliable-condition/fiber laser, and also the nonlinear optical crystals, prompts not only the average power but also the beam high quality (coherence) in the DUV lasers to an unprecedented degree.
The key problem of ultraviolet coherent light-weight source mainly concentrates on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is among the disorders for frequency transformation, so The expansion, sizing, injury resistance, conversion performance and allowable parameter variety of nonlinear optical crystal are needed Increasingly more.
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While in the scientific and industrial programs, the beam quality with the DUV laser can be a crucial parameter. Especially, the beam high-quality on the DUV laser significantly influences the laser machining outcomes. The beam excellent from the DUV laser is determined by that of the basic laser and the crystal for that frequency conversion. Not too long ago, a superior-energy DUV laser (>ten W) at 258 nm was described which has a beam quality of M2 < 1.5, which was produced by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would cause a far better laser machining result in comparison with the preceding check here DUV lasers with much larger M2.
The heartbeat period of the second Stokes gentle was shortened to five ns as shown in Figure 7a, one-shot picture through the oscilloscope, which happens to be a common phenomenon in Raman laser [forty four] whilst the heart beat duration in the pump laser was ten ns.
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Its UV absorption edge reaches a hundred and eighty nm. The successful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about 2 times as big as that of KDP. CLBO crystals is usually grown within the stoichiometric melt with decreased viscosity.
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