Not known Details About CLBO Crystal
Not known Details About CLBO Crystal
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All-solid-point out ultraviolet lasers happen to be extensively used in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of smaller volume, extended daily life, substantial performance, good beam high quality, broad tuning and slender spectral line, etcetera. Making use of superior ability near-infrared coherent light-weight supply as the fundamental frequency supply depending on nonlinear tuning technological know-how, creating ultraviolet coherent radiation by multistage frequency conversion is thought to be a very important strategy to acquire the ultraviolet coherent mild supply.
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The real key difficulty of ultraviolet coherent mild supply largely concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is without doubt one of the ailments for frequency transformation, so The expansion, dimensions, destruction resistance, conversion performance and allowable parameter choice of nonlinear optical crystal are required An increasing number of.
Conversely, the beam excellent of this increased ability DUV laser would become worse as a consequence of much more really serious thermal and nonlinear effects. Consequently, the frequency conversion procedures need to be cautiously created to mitigate the aforementioned consequences. So, a high-electrical power DUV laser in the FHG of 1 μm with a great beam good quality may very well be attained and may be beneficial for obtaining the shorter wavelength DUV lasers such as 193 nm by SFG.
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While in the scientific and industrial apps, the beam quality from the DUV laser is additionally a crucial parameter. Notably, the beam good quality on the DUV laser substantially impacts the laser machining final results. The beam high quality of the DUV laser is decided by that of the elemental laser along with the crystal for your frequency conversion. A short while ago, a significant-energy DUV laser (>ten W) at 258 nm was noted which has a beam top quality of M2 < one.five, which was generated by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would result in an even better laser machining result when compared to the previous DUV lasers with more substantial M2.
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The beam profile shown in Determine 7b shown a good beam excellent as one of the deserves of Raman laser, which would be advantageous to generate a 193-nm DUV laser with a top quality beam.
The conversion effectiveness from basic NIR to DUV is from five% click here to 36% based on the reported ends in Desk 1. Expanding the conversion effectiveness will lessen the burden on the design and set up of the fundamental laser amplifier together with the electric electric power consumption. An excellent beam high-quality of the elemental laser may also lead into the escalating with the conversion performance as well as the appropriate electric power depth on the NIR and green laser while in the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to environmentally friendly and environmentally friendly to DUV laser by usage of CLBO crystal are 70% and around fifty%, respectively [twelve], which corresponds into the conversion performance of 35% from elementary to DUV.
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