The best Side of CLBO Crystal
The best Side of CLBO Crystal
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All-sound-condition ultraviolet lasers are already commonly used in the fields of mechanical flaw detection, lithography, micromachining and medicine for some great benefits of tiny volume, extensive lifestyle, higher performance, superior beam excellent, broad tuning and slender spectral line, and so forth. Utilizing superior electric power close to-infrared coherent gentle source as the basic frequency resource according to nonlinear tuning technological know-how, producing ultraviolet coherent radiation by multistage frequency conversion is viewed as an important strategy to acquire the ultraviolet coherent light-weight supply.
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We summarized The existing growth position with the large-power DUV laser both equally on the wavelength of FHG of the 1-μm laser and at 193 nm. The the latest growth of the reliable-point out/fiber laser, and also the nonlinear optical crystals, prompts not merely the average electrical power but will also the beam high quality (coherence) on the DUV lasers to an unparalleled amount.
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。
Alternatively, the beam quality of this increased electrical power DUV laser would become worse as a consequence of a lot more major thermal and nonlinear effects. Consequently, the frequency conversion procedures should be very carefully built to mitigate the aforementioned consequences. Consequently, a high-electrical power DUV laser with the FHG of one μm with a good beam top quality may be acquired and will be helpful for obtaining the shorter wavelength DUV lasers like 193 nm by SFG.
LBO is additionally a wonderful nonlinear crystal which is always applied to the SHG with the NIR on the environmentally friendly. The DUV laser is normally recognized by two levels of SFG in the LBO crystals considering that there is no phase-matching angle for LBO to convert the green laser at 515 nm or 532 nm for the DUV right by SHG [16]. Not long ago, the NSBBF crystal has also demonstrated its likely to get a substantial conversion efficiency from 532 nm to 266 nm. The walk-off angle and deff from the NSBBF are Nearly similar to those of CLBO [seventeen].
On one other facet, the ability scaling with the NIR laser is another element to increase the ordinary ability on the 193-nm DUV laser. A result of the 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 develop a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength together with getting relative bigger electrical power [21]. Lately, a diamond Raman laser showed its capacity in reaching a higher electric power plus a higher conversion performance at the 1st Stokes with the one-μm laser [22,23], which means the chance for being applied while in the 193-nm DUV laser era thanks to its substantial Raman obtain and large frequency change.
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Inside the scientific and industrial purposes, the beam excellent from the DUV laser can also be an important parameter. Significantly, the beam good quality from the DUV laser radically impacts the laser machining success. The beam good quality of the DUV laser is set by that of the elemental laser as well as the crystal with the frequency conversion. A short while ago, a large-ability DUV laser (>10 W) at 258 nm was documented which has a beam good 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 bring about an even better laser machining final result in comparison with the past DUV lasers with larger M2.
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Tunable ultraviolet laser resource dependant on solid-state dye laser technologies and CsLiB6O10 harmonic generation
The conversion efficiency from essential NIR to DUV is from 5% to 36% in accordance with the described leads to Desk 1. Raising the conversion efficiency will lessen the burden on the look and set up of the basic laser amplifier as well as the electrical power intake. A good beam good quality of the fundamental laser can even contribute for the raising of the conversion efficiency and also 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 usage of CLBO crystal are check here 70% and around fifty%, respectively [twelve], which corresponds to your conversion effectiveness of 35% from basic to DUV.
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