The 2-Minute Rule for CLBO Crystal
The 2-Minute Rule for CLBO Crystal
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All-good-state ultraviolet lasers have already been commonly Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of tiny quantity, lengthy everyday living, substantial performance, excellent beam high-quality, wide tuning and slim spectral line, and many others. Making use of substantial energy in the vicinity of-infrared coherent mild supply as the elemental frequency source depending on nonlinear tuning technologies, generating ultraviolet coherent radiation by multistage frequency conversion is considered an essential approach to produce the ultraviolet coherent gentle supply.
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全固态紫外激光器以其体积小、寿命长、效率高、光束质量好、调谐范围宽、谱线窄等优点，广泛应用于机械探伤、光刻、微加工和医学等领域，等，利用大功率近红外相干光源作为基于非线性调谐技术的基频源，通过多级变频产生紫外相干辐射被认为是发展紫外相干光源的重要途径。紫外相干光源的关键问题是研制紫外波段的非线性光学变频晶体。非线性光学晶体是实现频率变换的条件之一，因此对非线性光学晶体的生长、尺寸、损伤电阻、转换效率和允许的参数范围提出了越来越高的要求。
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LBO is usually an outstanding nonlinear crystal which is often placed on the SHG within the NIR to the green. The DUV laser is generally realized by two phases of SFG inside the LBO crystals considering that there is not any phase-matching angle for LBO to transform the environmentally friendly laser at 515 nm or 532 nm to your DUV directly by SHG [sixteen]. Just lately, the NSBBF crystal has also proven its possible to acquire a substantial conversion efficiency from 532 nm to 266 nm. The stroll-off angle and deff from the NSBBF are almost much like those of CLBO [seventeen].
On one other facet, the ability scaling on the NIR laser is another aspect to boost the regular electricity in the 193-nm DUV laser. As a result of not enough the substantial-electrical power amplification Remedy of the NIR laser (one example is at 1553 nm), nonlinear frequency processes for instance optical parameter oscillation (OPO) might be placed on build a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength as well as acquiring relative higher electric power [21]. Lately, a diamond Raman laser confirmed its means in accomplishing a substantial power plus a superior conversion efficiency at the 1st Stokes from the 1-μm laser [22,23], which suggests the likelihood being utilized from the 193-nm DUV laser era as a consequence of its significant Raman acquire and huge frequency shift.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the simplest non-linear crystal which generates ultraviolet harmonics of your Nd:YAG essential laser wavelength. So that you can greatly enhance the problems threshold, lower CLBO surface area roughness, by extremely-precision machining, is necessary. Since the CLBO crystal has quick hydroscopic reaction and micro scratches in machining, extremely-specific machining on the CLBO crystal is actually a difficult technological difficulty.
The beam profile demonstrated in Determine 7b shown a good beam top quality as among the list of deserves of Raman laser, which might be effective to generate a 193-nm DUV laser with a top quality beam.
The conversion effectiveness from fundamental NIR to DUV is from 5% to 36% in accordance with the documented results in Desk 1. Expanding the conversion effectiveness will lessen the load on the look and setup of the elemental laser amplifier in addition to the electric power intake. A great beam excellent of the fundamental laser may even add towards the raising of the conversion effectiveness and the suitable ability depth of your NIR and green laser within the SHG and FHG method, respectively. The very best conversion efficiencies from NIR to eco-friendly and eco-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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