The 2-Minute Rule for CLBO Crystal
The 2-Minute Rule for CLBO Crystal
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According to the evidence-of-basic principle experiment, the conversion effectiveness of 23% implied the potential of achieving substantial-electricity at the second Stokes wavelength of your Raman laser. If your pump laser of 1078 nm could possibly be attained at the common electric power of 50 W, the output electric power of its 2nd Stokes wavelength at 1512 nm could possibly be greater than ten W. The design on the Raman laser cavity ought to be optimized so that you can steer clear of the harm with 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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On the opposite aspect, the power scaling of the NIR laser is yet another part to improve the regular electrical power from the 193-nm DUV laser. Because of the not enough the substantial-energy amplification solution on the NIR laser (as an example at 1553 nm), nonlinear frequency procedures including optical parameter oscillation (OPO) can be applied to produce a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and also getting relative increased power [21]. Not long ago, a diamond Raman laser confirmed its capability in obtaining a superior energy as well as a significant conversion performance within the 1st Stokes of your one-μm laser [22,23], which means the possibility to generally be applied while in the 193-nm DUV laser era thanks to its high Raman acquire and large frequency shift.
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Inside the scientific and industrial programs, the beam excellent of your DUV laser is usually an important parameter. Significantly, the beam quality of your DUV laser considerably influences the laser machining final results. The beam quality of your DUV laser is set by that of the fundamental laser and the crystal for that frequency conversion. Just lately, a higher-ability DUV laser (>10 W) at 258 nm was described having a beam high-quality of M2 < 1.five, which was created by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would result in a far better laser machining outcome as compared to the prior DUV lasers with larger sized M2.
The pulse length of the second Stokes light-weight was here shortened to 5 ns as revealed in Figure 7a, a single-shot photo in the oscilloscope, which is a typical phenomenon in Raman laser [forty four] even though the pulse length of the pump laser was 10 ns.
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The conversion performance from elementary NIR to DUV is from 5% to 36% based on the reported ends in Table 1. Expanding the conversion effectiveness will lessen the burden on the look and setup of the basic laser amplifier along with the electric electricity consumption. A superb beam quality of the fundamental laser can even add towards the rising of your conversion efficiency in addition to the suitable electricity intensity from the NIR and eco-friendly laser while in the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to inexperienced and inexperienced to DUV laser by utilization of CLBO crystal are 70% and all around 50%, respectively [12], which corresponds to the conversion performance of 35% from essential to DUV.
The event of the 193-nm laser was demonstrated by levels of SFG. As a way to scale the DUV laser electric power efficiently, a completely new idea with the 193-nm DUV laser generation is presented based upon the diamond Raman laser.