On the other hand, so as to procedure the crystal is very Innovative producing strategies are required. For the reason that dawn of the crystal, working on this obstacle, we are now the sole corporation on earth that can be processed During this crystal.
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We summarized the current progress position in the substantial-electrical power DUV laser equally within the wavelength of FHG of the one-μm laser and at 193 nm. The latest improvement with the solid-point out/fiber laser, along with the nonlinear optical crystals, prompts not simply the common energy but will also the beam excellent (coherence) of your DUV lasers to an unprecedented degree.
The main element difficulty of ultraviolet coherent mild resource mainly concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is one of the disorders for frequency transformation, so the growth, size, destruction resistance, conversion effectiveness and allowable parameter range of nonlinear optical crystal are expected A lot more.
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Inside the scientific and industrial programs, the beam top quality in the DUV laser is additionally a crucial parameter. Specifically, the beam high quality of the DUV laser radically influences the laser machining final results. The beam quality with the DUV laser is determined by that of the elemental laser as well as the crystal for the frequency conversion. Not long ago, a large-ability DUV laser (>10 W) at 258 nm was described having a beam excellent of M2 < 1.5, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would bring about a far better laser machining outcome when compared to the previous DUV lasers with greater M2.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the simplest non-linear crystal which generates ultraviolet harmonics of your Nd:YAG elementary laser wavelength. So that you can enrich the problems threshold, minimal CLBO surface roughness, by ultra-precision machining, is necessary. Since the CLBO crystal has easy hydroscopic reaction and micro scratches in machining, extremely-precise machining with the CLBO crystal is actually a difficult complex difficulty.
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The conversion effectiveness from fundamental NIR to DUV is from 5% to 36% in accordance with the documented results in Table one. Growing the conversion effectiveness will lessen the burden on the design and set up of the fundamental laser amplifier as well as the electrical ability consumption. A superb beam top quality of the basic laser will likely contribute for the raising of your conversion efficiency in addition to the suitable electricity intensity on the NIR and inexperienced laser from the SHG and FHG system, respectively. The best conversion efficiencies from NIR to environmentally friendly and inexperienced to DUV laser by utilization of CLBO crystal are 70% and close to 50%, respectively [twelve], which corresponds to your conversion effectiveness of 35% from basic to DUV.
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