The 2-Minute Rule for CLBO Crystal
The 2-Minute Rule for CLBO Crystal
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All-sound-condition ultraviolet lasers are already commonly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the advantages of little volume, extended lifestyle, higher efficiency, great beam top quality, vast tuning and narrow spectral line, and so forth. Making use of higher energy in the vicinity of-infrared coherent gentle source as the basic frequency source based upon nonlinear tuning know-how, building ultraviolet coherent radiation by multistage frequency conversion is viewed as a crucial technique to build the ultraviolet coherent light resource.
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By way of example, the current concave OC could get replaced by a airplane mirror which could mitigate the ability density within the area of M1 along with the diamond. What's more, applying higher problems threshold coatings for M1 and diamond would also Increase the output energy without any damages. Then, the NIR laser with the 2nd Stokes wavelength can be high plenty of, as well as its great beam top quality, to deliver the ultimate DUV laser at 193 nm using a significant average energy.
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LBO can also be an outstanding nonlinear crystal which is always applied to the SHG with the NIR to your eco-friendly. The DUV laser is frequently understood by two levels of SFG within the LBO crystals considering that there is no phase-matching angle for LBO to convert the green laser at 515 nm or 532 nm to website the DUV straight by SHG [16]. Recently, the NSBBF crystal has also demonstrated its likely to acquire a high conversion effectiveness from 532 nm to 266 nm. The stroll-off angle and deff on the NSBBF are Practically just like All those of CLBO [seventeen].
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During the scientific and industrial applications, the beam quality from the DUV laser can also be a vital parameter. Specially, the beam high quality in the DUV laser drastically affects the laser machining final results. The beam high quality of the DUV laser is decided by that of the fundamental laser plus the crystal for your frequency conversion. A short while ago, a substantial-power DUV laser (>10 W) at 258 nm was claimed using a beam high-quality of M2 < 1.5, which was created by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would cause an even better laser machining result when compared to the prior DUV lasers with more substantial M2.
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Additionally, combining the strong-point out laser with other nonlinear procedure for instance stimulated Raman scattering, NIR lasers might be obtained at new wavelengths with superior electricity and superior beam high quality, which was examined because of the proof-of-theory experiment. This Raman laser scheme delivers a different path to the significant-ability DUV laser, Primarily at the wavelength of 193 nm.
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The conversion efficiency from essential NIR to DUV is from 5% to 36% in accordance with the documented brings about Table 1. Expanding the conversion effectiveness will lessen the burden on the design and set up of the elemental laser amplifier in addition to the electrical ability usage. A fantastic beam high quality of the basic laser will also contribute on the increasing in the conversion effectiveness together with the right power intensity from the NIR and eco-friendly laser while in the SHG and FHG system, respectively. The best conversion efficiencies from NIR to environmentally friendly and environmentally friendly to DUV laser by use of CLBO crystal are 70% and about 50%, respectively [twelve], which corresponds into the conversion performance of 35% from elementary to DUV.
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