All-solid-state ultraviolet lasers are already broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of small volume, extended daily life, significant efficiency, great beam top quality, vast tuning and slim spectral line, etcetera. Making use of large electrical power close to-infrared coherent light-weight resource as the basic frequency resource determined by nonlinear tuning technological innovation, generating ultraviolet coherent radiation by multistage frequency conversion is regarded as a very important method to establish the ultraviolet coherent mild resource.
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For example, the current concave OC could be replaced by a plane mirror which could mitigate the facility density within the surface area of M1 and also the diamond. Additionally, employing substantial destruction threshold coatings for M1 and diamond would also improve the output power with none damages. Then, the NIR laser at the 2nd Stokes wavelength can be higher more than enough, along with its fantastic beam quality, to generate the final DUV laser at 193 nm that has a substantial regular electric power.
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Both the 1040 nm and 1078 nm laser originate from just one dual-wavelength Yb-doped fiber laser. Every laser is amplified by stages of fiber amplifier and Yb-doped products amplifier, respectively.
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While in the scientific and industrial programs, the beam good quality in the DUV laser is additionally a crucial parameter. Specifically, the beam top quality in the DUV laser dramatically has an effect on the laser machining results. The beam top quality from the DUV laser is set by that of the fundamental laser and also the crystal to the frequency conversion. Recently, a substantial-ability DUV laser (>10 W) at 258 nm was here documented by using a beam quality of M2 < one.five, which was generated by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would result in an improved laser machining result in comparison with the earlier DUV lasers with greater M2.
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Moreover, combining the reliable-point out laser with other nonlinear approach like stimulated Raman scattering, NIR lasers can be attained at new wavelengths with significant power and high beam high quality, which was examined with the evidence-of-theory experiment. This Raman laser plan presents a new route to the high-energy DUV laser, Specifically in the wavelength of 193 nm.
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The conversion performance from basic NIR to DUV is from five% to 36% based on the reported brings about Table one. Escalating the conversion performance will reduce the stress on the design and setup of the elemental laser amplifier in addition to the electric powered electrical power use. A great beam excellent of the fundamental laser will even lead into the growing on the conversion performance as well as the appropriate electricity depth with the NIR and environmentally friendly laser within the SHG and FHG method, respectively. The highest conversion efficiencies from NIR to eco-friendly and eco-friendly to DUV laser by utilization of CLBO crystal are 70% and all around 50%, respectively [12], which corresponds towards the conversion efficiency of 35% from fundamental to DUV.
The development of your 193-nm laser was demonstrated by levels of SFG. As a way to scale the DUV laser power properly, a different principle from the 193-nm DUV laser era is introduced according to the diamond Raman laser.