The Ultimate Guide To CLBO Crystal
The Ultimate Guide To CLBO Crystal
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All-sound-state ultraviolet lasers have already been commonly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of modest volume, extensive life, superior performance, great beam high-quality, wide tuning and slender spectral line, etcetera. Employing superior electric power in close proximity to-infrared coherent gentle source as the basic frequency supply depending on nonlinear tuning technological innovation, generating ultraviolet coherent radiation by multistage frequency conversion is viewed as a crucial strategy to develop the ultraviolet coherent mild supply.
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By way of example, The existing concave OC could get replaced by a aircraft mirror which could mitigate the facility density around the surface area of M1 as well as the diamond. Additionally, working with large injury threshold coatings for M1 and diamond would also improve the output energy with none damages. Then, the NIR laser on the 2nd Stokes wavelength might be higher plenty of, and its very good beam high quality, to crank out the ultimate DUV laser at 193 nm by using a higher normal ability.
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LBO is usually a superb nonlinear crystal which is often applied to the SHG from your NIR into the green. The DUV laser is frequently realized by two levels of SFG in the LBO crystals considering that there is not any section-matching angle for LBO to transform the inexperienced laser at 515 nm or 532 nm to your DUV instantly by SHG [sixteen]. Recently, the NSBBF crystal has also demonstrated its probable to get a large conversion efficiency from 532 nm to 266 nm. The wander-off angle and deff of your NSBBF are Pretty much similar to those of CLBO [seventeen].
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From the scientific and industrial apps, the beam high-quality of your DUV laser is usually an important parameter. Especially, the beam high quality on the DUV laser substantially impacts the laser machining results. The beam quality on the DUV laser is decided by that of the elemental laser and also the crystal with the frequency conversion. Just lately, a high-electric power DUV laser (>10 W) at 258 nm was documented which has a beam top quality of M2 < one.five, which was created by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would produce a much better laser machining final result in comparison with the preceding DUV lasers with larger sized M2.
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What's more, combining the reliable-state laser with other nonlinear approach such as stimulated Raman scattering, NIR lasers may be achieved at new wavelengths with large electrical power and significant beam quality, which was examined because of the evidence-of-basic principle experiment. This Raman laser scheme offers a whole new route to the substantial-electricity DUV laser, In particular for the wavelength of 193 nm.
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The conversion effectiveness from fundamental NIR to DUV is from five% to 36% according to the claimed leads to Desk 1. Raising the conversion efficiency will reduce the load on the look and set up of the basic laser amplifier as well as the electrical ability usage. A fantastic beam high quality of the basic laser will likely contribute for the expanding of the conversion efficiency and also the suitable electric power depth of your NIR and green laser from the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to green and green to DUV laser by use of CLBO crystal are 70% and all-around fifty%, respectively [12], which corresponds for the conversion efficiency of 35% from fundamental to DUV.
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