The Definitive Guide to CLBO Crystal

The Definitive Guide to CLBO Crystal

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All-reliable-state ultraviolet lasers have already been broadly used in the fields of mechanical flaw detection, lithography, micromachining and medication for the advantages of tiny volume, extensive lifetime, large performance, excellent beam top quality, vast tuning and slender spectral line, etcetera. Making use of high electricity near-infrared coherent gentle resource as the basic frequency resource depending on nonlinear tuning technological innovation, building ultraviolet coherent radiation by multistage frequency conversion is thought to be a very important method to produce the ultraviolet coherent gentle resource.

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According to the proof-of-theory experiment, the conversion effectiveness of 23% implied the potential of accomplishing large-electric power at the next Stokes wavelength from the Raman laser. When the pump laser of 1078 nm could possibly be acquired at the standard electric power of fifty W, the output electricity of its 2nd Stokes wavelength at 1512 nm could possibly be greater than 10 W. The look of the Raman laser cavity really should be optimized so that you can steer clear of the hurt of your M1 and diamond area.

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。

Then again, the beam top quality of this bigger power DUV laser would come to be even worse as a consequence of far more severe thermal and nonlinear consequences. That's why, the frequency conversion procedures should be meticulously made to mitigate the aforementioned results. So, a large-electric power DUV laser in the FHG of one μm with a good beam top quality may very well be attained and can be valuable for acquiring the shorter wavelength DUV lasers for instance 193 nm by SFG.

LBO can be an excellent nonlinear crystal which is always placed on the SHG with the NIR to the eco-friendly. The DUV laser will likely be understood by two levels of SFG during the LBO crystals considering that there is no period-matching angle for LBO to transform the green laser at 515 nm or 532 nm for the DUV immediately by SHG [sixteen]. Not long ago, the NSBBF crystal has also shown its opportunity to get a superior conversion performance from 532 nm to 266 nm. The walk-off angle and deff from the NSBBF are Pretty much much like These of CLBO [seventeen].

On one other aspect, the ability scaling of your NIR laser is an additional component to boost the ordinary electricity on the 193-nm DUV laser. Because of the lack of the higher-electrical power amplification Option in the NIR laser (such as at 1553 nm), nonlinear frequency processes including optical parameter oscillation (OPO) can be applied to establish a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and getting relative bigger electricity [21]. Not long ago, a diamond Raman laser confirmed its ability in achieving a large power in addition to a significant conversion performance with the 1st Stokes with the one-μm laser [22,23], which implies the possibility being used within the 193-nm DUV laser era as a result of its significant Raman attain and enormous frequency shift.

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From the scientific and industrial programs, the beam excellent on the DUV laser is additionally an essential parameter. Particularly, the beam high-quality on the DUV laser drastically has an effect on the laser machining benefits. The beam high quality of your DUV laser is set by that of the elemental laser as well as the crystal with the frequency conversion. Not too long ago, a superior-ability DUV laser (>10 W) at 258 nm was described having a beam good quality of M2 < one.five, which was generated by FHG of the Yb:YAG laser at 1030 nm using the CLBO crystal [thirteen]. This laser would result in an improved laser machining outcome in comparison to the prior DUV lasers with larger M2.

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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear crystal which generates ultraviolet harmonics on the Nd:YAG elementary laser wavelength. To be able to greatly enhance the harm threshold, minimal CLBO surface area roughness, by extremely-precision machining, is required. Since the CLBO crystal has uncomplicated hydroscopic response and micro scratches in machining, extremely-precise machining with the CLBO crystal is a tough complex trouble.

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The conversion effectiveness from elementary NIR to DUV is from five% to 36% according to the reported leads to Table 1. Rising the conversion efficiency will reduce the burden on the design and set up of the fundamental laser amplifier together with the electrical electrical power use. A very good beam high quality of the elemental laser will even contribute into the expanding of your conversion performance along with the appropriate energy depth of your NIR and inexperienced laser from the SHG and FHG system, respectively. The very best conversion efficiencies from NIR to environmentally friendly and green to DUV laser by use of CLBO crystal are 70% and all-around 50%, respectively [12], which corresponds towards the conversion efficiency of 35% from essential to DUV.

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