CLBO Crystal Secrets
CLBO Crystal Secrets
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We summarized the current advancement position from the large-power DUV laser both equally within the wavelength of FHG from the one-μm laser and at 193 nm. The current development from the reliable-point out/fiber laser, plus the nonlinear optical crystals, prompts don't just the standard electricity but will also the beam high-quality (coherence) of your DUV lasers to an unprecedented stage.
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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LBO is additionally a great nonlinear crystal which is usually placed on the SHG from your NIR for the green. The DUV laser is often recognized by two stages of SFG while in the LBO crystals considering the fact that there's no section-matching angle for LBO to transform the green laser at 515 nm or 532 nm towards the DUV right by SHG [16]. Not long ago, the NSBBF crystal has also proven its prospective to obtain a large conversion effectiveness from 532 nm to 266 nm. The wander-off angle and deff on the NSBBF are almost comparable to These of CLBO [17].
On the other aspect, the ability scaling on the NIR laser is yet another aspect to boost the typical electricity of the 193-nm DUV laser. Due to the not enough the significant-energy amplification Option of the NIR laser (one example is at 1553 nm), nonlinear frequency procedures such as optical parameter oscillation (OPO) could be applied to establish a wavelength converter by shifting the wavelength from one μm to the desired wavelength together with acquiring relative higher energy [21]. Not too long ago, a diamond Raman laser confirmed its ability in reaching a substantial electricity and also a substantial conversion effectiveness for the 1st Stokes with the one-μm laser [22,23], which implies the likelihood to be applied within the 193-nm DUV laser technology as a consequence of its higher Raman gain and enormous frequency shift.
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The conversion performance from fundamental NIR to DUV is from five% to 36% according to the claimed brings about Desk one. Increasing the conversion performance will reduce the load on the look and set up of the elemental laser amplifier and also the electric powered electrical power intake. A superb beam excellent of the basic laser will likely contribute to your growing in the conversion performance together with the right electrical power intensity in the NIR and eco-friendly laser while in the SHG and FHG system, respectively. The best conversion efficiencies from NIR to environmentally friendly and inexperienced to DUV laser by use of CLBO crystal are 70% and about fifty%, respectively [12], which corresponds into the conversion efficiency of 35% from fundamental to DUV.
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