5 Essential Elements For CLBO Crystal
5 Essential Elements For CLBO Crystal
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The true secret issue of ultraviolet coherent light-weight source generally concentrates on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is among the circumstances for frequency transformation, so The expansion, sizing, problems resistance, conversion effectiveness and allowable parameter selection of nonlinear optical crystal are required Progressively more.
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LBO can also be an outstanding nonlinear crystal which is often applied to the SHG through the NIR into the environmentally friendly. The DUV laser is often understood by two levels of SFG in the LBO crystals given that there isn't a section-matching angle for LBO to transform the inexperienced laser at 515 nm or 532 nm to your DUV instantly by SHG [16]. Just lately, the NSBBF crystal has also proven its likely to get a large conversion efficiency from 532 nm to 266 nm. The wander-off angle and deff with the NSBBF are Just about much like These of CLBO [seventeen].
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During 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 dramatically influences the laser machining final results. The beam high quality of your 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 reported by using a beam quality of M2 < 1.five, which was created by FHG of the Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would bring on a greater laser machining end result when compared to the previous DUV lasers with more substantial M2.
The pulse period of the next Stokes mild was shortened to five ns as proven in Determine 7a, just one-shot photograph in the oscilloscope, that is a common phenomenon in Raman laser [forty four] though the pulse period of the pump laser was 10 ns.
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The conversion efficiency from elementary NIR to DUV is from 5% to 36% based on the noted brings about Table one. Growing the conversion performance will reduce the load on the look and setup of the elemental laser amplifier in website addition to the electric powered energy intake. A good beam high-quality of the elemental laser may even add for the increasing from the conversion effectiveness together with the right power intensity from the NIR and eco-friendly laser inside the SHG and FHG approach, respectively. The very best conversion efficiencies from NIR to inexperienced and inexperienced to DUV laser by utilization of CLBO crystal are 70% and close to 50%, respectively [12], which corresponds into the conversion performance of 35% from essential to DUV.
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