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According to the evidence-of-theory experiment, the conversion efficiency of 23% implied the possibility of reaching higher-ability at the next Stokes wavelength in the Raman laser. When the pump laser of 1078 nm may be attained at the standard electrical power of 50 W, the output electrical power of its 2nd Stokes wavelength at 1512 nm may very well be greater than ten W. The design of the Raman laser cavity ought to be optimized so that you can stay away from the hurt of your 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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Both equally the 1040 nm and 1078 nm laser come from a single twin-wavelength Yb-doped fiber laser. Every single laser is amplified by stages of fiber amplifier and Yb-doped products amplifier, respectively.
On the opposite facet, the ability scaling of the NIR laser is another facet to enhance the normal electric power with the 193-nm DUV laser. As a result of not enough the superior-electricity amplification solution of your NIR laser (such as at 1553 nm), nonlinear frequency processes which include optical parameter oscillation (OPO) can be placed on make a wavelength converter by shifting the wavelength from one μm to the desired wavelength as well as obtaining relative higher electric power [21]. Recently, a diamond Raman laser showed its capacity in acquiring a high energy along with a significant conversion performance in the 1st Stokes of your one-μm laser [22,23], which implies the possibility to generally be applied in the 193-nm DUV laser generation thanks to its large Raman attain and enormous frequency change.
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The pulse period of the next Stokes light was shortened to 5 ns as shown in Figure 7a, a single-shot photograph through the oscilloscope, which can be a typical phenomenon in Raman laser [44] even though the pulse period on the pump laser was 10 ns.
Cesium Lithium Borate (CsLiB6O10 or CLBO) is the CLBO Crystal simplest non-linear crystal which generates ultraviolet harmonics of the Nd:YAG fundamental laser wavelength. In order to boost the damage threshold, minimal CLBO surface area roughness, by extremely-precision machining, is required. Because the CLBO crystal has uncomplicated hydroscopic reaction and micro scratches in machining, ultra-specific machining in the CLBO crystal is a challenging technological challenge.
The beam profile revealed in Figure 7b shown an excellent beam excellent as one of many deserves of Raman laser, which would be effective to create a 193-nm DUV laser with a high quality beam.
The conversion efficiency from basic NIR to DUV is from 5% to 36% according to the reported ends in Desk one. Growing the conversion effectiveness will lessen the stress on the design and set up of the elemental laser amplifier in addition to the electric electrical power intake. An excellent beam top quality of the fundamental laser will even contribute into the growing of the conversion performance as well as the appropriate electricity intensity on the NIR and eco-friendly laser within the SHG and FHG course of action, respectively. The very best conversion efficiencies from NIR to green and green to DUV laser by utilization of CLBO crystal are 70% and all-around fifty%, respectively [12], which corresponds towards the conversion effectiveness of 35% from fundamental to DUV.
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