The smart Trick of CLBO Crystal That Nobody is Discussing
The smart Trick of CLBO Crystal That Nobody is Discussing
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All-solid-condition ultraviolet lasers are actually commonly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the advantages of tiny quantity, very long life, substantial performance, superior beam good quality, broad tuning and slim spectral line, etc. Employing higher electrical power in the vicinity of-infrared coherent gentle resource as the elemental frequency source according to nonlinear tuning technological innovation, generating ultraviolet coherent radiation by multistage frequency conversion is thought to be a very important way to create the ultraviolet coherent light-weight source.
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We summarized The present advancement status in the substantial-ability DUV laser both on the wavelength of FHG with the one-μm laser and at 193 nm. The the latest progress from the sound-condition/fiber laser, along with the nonlinear optical crystals, prompts not merely the normal ability and also the beam excellent (coherence) in the DUV lasers to an unprecedented level.
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 top quality of the increased power DUV laser would grow to be even worse because of additional significant thermal and nonlinear consequences. Consequently, the frequency conversion procedures ought to be thoroughly intended to mitigate the aforementioned consequences. Hence, a substantial-electric power DUV laser within the FHG of one μm with a good beam high quality can be attained and may be valuable for acquiring the shorter wavelength DUV lasers such as 193 nm by SFG.
LBO is usually a great nonlinear crystal which is usually applied to the SHG through the NIR to the green. The DUV laser is normally understood by two levels of SFG during the LBO crystals considering that there is not any phase-matching angle for LBO to transform the inexperienced laser at 515 nm or 532 nm to the DUV specifically by SHG [sixteen]. Not long ago, the NSBBF crystal has also revealed its possible to get a superior conversion performance from 532 nm to 266 nm. The stroll-off angle and deff on the NSBBF are almost comparable to Individuals of CLBO [17].
On one other facet, the facility scaling with the NIR laser is yet another element to raise the common electrical power in the 193-nm DUV laser. As a result of lack of the superior-electricity amplification Remedy of your NIR laser (one example is at 1553 nm), nonlinear frequency processes for instance optical parameter oscillation (OPO) could possibly be placed on create a wavelength converter by shifting the wavelength from one μm to the desired wavelength and obtaining relative increased power [21]. Just lately, a diamond Raman laser confirmed its capability in attaining a large ability as well as a significant conversion performance in the 1st Stokes on the one-μm laser [22,23], which means the possibility for being utilized from the 193-nm DUV laser technology due to its high Raman gain and enormous frequency change.
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Inside the scientific and industrial apps, the beam excellent with the DUV laser is likewise a very important parameter. Specially, the beam excellent on the DUV laser substantially affects the laser machining effects. The beam good quality in the DUV laser is set by that of the fundamental laser and the crystal with the frequency conversion. Just lately, a large-energy DUV laser (>10 W) at 258 nm was described using a beam 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 bring about a far better laser machining outcome when compared to the preceding DUV lasers with larger M2.
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Tunable ultraviolet laser resource based on strong-state dye laser technologies and CsLiB6O10 harmonic technology
The conversion performance from basic NIR to DUV is from five% to 36% according to the claimed leads to Desk 1. Raising the more info conversion efficiency will decrease the burden on the design and set up of the fundamental laser amplifier together with the electric electric power consumption. A fantastic beam quality of the basic laser will even lead to the escalating of your conversion efficiency along with the suitable ability depth from the NIR and eco-friendly 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 to your conversion performance of 35% from essential to DUV.
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