The Basic Principles Of CLBO Crystal
The Basic Principles Of CLBO Crystal
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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。
On the other hand, the beam quality of this higher electricity DUV laser would grow to be worse resulting from much more really serious thermal and nonlinear outcomes. Consequently, the frequency conversion processes need to be carefully intended to mitigate the aforementioned effects. Therefore, a superior-energy DUV laser at the FHG of one μm with a superb beam high quality may be attained and can be useful for obtaining the shorter wavelength DUV lasers for instance 193 nm by SFG.
LBO can be a superb nonlinear crystal which is often placed on the SHG with the NIR into the eco-friendly. The DUV laser is usually recognized by two phases of SFG inside the LBO crystals given that there isn't any period-matching angle for LBO to convert the green laser at 515 nm or 532 nm towards the DUV instantly by SHG [sixteen]. Just lately, the NSBBF crystal has also revealed its likely to obtain a substantial conversion effectiveness from 532 nm to 266 nm. The wander-off angle and deff of the NSBBF are Virtually much like those of CLBO [seventeen].
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Within the scientific and industrial applications, the beam quality of the DUV laser can be a significant parameter. Notably, the beam high quality in the DUV laser drastically impacts the laser machining results. The beam quality of the DUV laser is determined by that of the fundamental laser and also the crystal to the frequency conversion. Lately, a significant-electrical power DUV laser (>10 W) at 258 nm was described with a beam quality of M2 < 1.five, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would lead to a much better laser machining final result in comparison to the earlier DUV lasers with more substantial M2.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the most effective non-linear crystal which generates ultraviolet harmonics with the Nd:YAG essential laser wavelength. As a way to increase the damage threshold, reduced CLBO floor roughness, by extremely-precision machining, is required. As the CLBO crystal has simple hydroscopic reaction and micro scratches in machining, ultra-precise machining of the CLBO crystal is a tough specialized issue.
The beam profile demonstrated in Figure 7b shown a superb beam top quality as one of many deserves of Raman laser, which might be effective to crank out a 193-nm DUV laser with a high quality click here beam.
Its UV absorption edge reaches one hundred eighty nm. The productive nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about 2 times as large as that of KDP. CLBO crystals may be grown within the stoichiometric melt with lessen viscosity.
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