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Based on the evidence-of-theory experiment, the conversion efficiency of 23% implied the opportunity of achieving significant-electrical power at the next Stokes wavelength on the Raman laser. When the pump laser of 1078 nm may very well be obtained at the normal power of 50 W, the output electricity of its 2nd Stokes wavelength at 1512 nm can be over ten W. The look from the Raman laser cavity really should be optimized to be able to steer clear of the destruction from the M1 and diamond surface 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。
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Because of the thermal lens result inside the reliable-condition lasers, If your heating administration is inadequate, It's not necessarily uncomplicated to acquire the solid-point out laser with a higher energy along with a large beam high quality simultaneously. Recently, with the development of The skinny disk laser and one-crystal fiber (SCF) laser, a significant-electricity laser at the fundamental wavelength (1 μm) were recognized with a superb beam good quality In spite of a TEM00 method beam [4,24], which would be good candidates for the elemental with the DUV laser era. One more prospect for the basic may be the higher-power fiber laser which can be reached by coherent beam combination with M2 benefit below more info 1.
On the other aspect, the facility scaling on the NIR laser is another component to raise the typical ability on the 193-nm DUV laser. Because of the not enough the large-ability amplification Resolution of the NIR laser (one example is at 1553 nm), nonlinear frequency processes for instance optical parameter oscillation (OPO) may very well be applied to build a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength in addition to obtaining relative better power [21]. A short while ago, a diamond Raman laser confirmed its means in achieving a large ability and a superior conversion efficiency with the 1st Stokes on the 1-μm laser [22,23], which implies the likelihood to generally be utilized inside the 193-nm DUV laser generation because of its large Raman get and large frequency change.
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In the scientific and industrial programs, the beam high-quality of the DUV laser is usually a significant parameter. Especially, the beam high quality with the DUV laser significantly affects the laser machining outcomes. The beam high quality in the DUV laser is determined by that of the basic laser and also the crystal with the frequency conversion. Not too long ago, a significant-power DUV laser (>10 W) at 258 nm was noted that has a beam top 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 produce a greater laser machining consequence when compared with the past DUV lasers with bigger 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 basic laser wavelength. So that you can greatly enhance the destruction threshold, low CLBO area roughness, by extremely-precision machining, is required. Since the CLBO crystal has effortless hydroscopic reaction and micro scratches in machining, ultra-precise machining of the CLBO crystal is really a difficult technical trouble.
The beam profile demonstrated in Figure 7b shown an excellent beam high quality as on the list of merits of Raman laser, which might be helpful to generate a 193-nm DUV laser with a top quality beam.
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