All-reliable-state ultraviolet lasers happen to be extensively Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of small volume, lengthy lifestyle, superior effectiveness, very good beam good quality, extensive tuning and narrow spectral line, etcetera. Making use of high electricity in close proximity to-infrared coherent light supply as the fundamental frequency supply determined by nonlinear tuning technological innovation, creating ultraviolet coherent radiation by multistage frequency conversion is considered to be a crucial technique to create the ultraviolet coherent gentle resource.
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Based on the evidence-of-basic principle experiment, the conversion effectiveness of 23% implied the possibility of obtaining superior-ability at the 2nd Stokes wavelength of your Raman laser. When the pump laser of 1078 nm could possibly be attained at the standard electric power of fifty W, the output energy of its 2nd Stokes wavelength at 1512 nm could possibly be over ten W. The design in the Raman laser cavity must be optimized as a way to avoid the hurt of the M1 and diamond area.
For instance, The present concave OC could get replaced by a plane mirror which could mitigate the power density around the floor of M1 as well as diamond. Additionally, utilizing significant harm threshold coatings for M1 and diamond would also Enhance the output ability with none damages. Then, the NIR laser with the 2nd Stokes wavelength can be higher more than enough, and its very good beam high-quality, to produce the final DUV laser at 193 nm which has a higher regular electricity.
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LBO is usually a superb nonlinear crystal which is often placed on the SHG from your NIR to your environmentally friendly. The DUV laser is generally realized by two stages of SFG during the LBO crystals given that there is absolutely no period-matching angle for LBO to transform the inexperienced laser at 515 nm or 532 nm to the DUV straight by SHG [16]. A short while ago, the NSBBF crystal has also shown its probable to acquire a significant conversion performance from 532 nm to 266 nm. The stroll-off angle and deff in the NSBBF are Pretty much similar to Those people of website CLBO [17].
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Also, combining the sound-point out laser with other nonlinear course of action like stimulated Raman scattering, NIR lasers may very well be attained at new wavelengths with high electrical power and superior beam top quality, which was examined via the evidence-of-basic principle experiment. This Raman laser plan gives a new path to the higher-electricity DUV laser, Specifically on the wavelength of 193 nm.
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Its UV absorption edge reaches 180 nm. The powerful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about twice as big as that of KDP. CLBO crystals might be grown in the stoichiometric soften with lessen viscosity.
The development with the 193-nm laser was demonstrated by stages of SFG. So that you can scale the DUV laser ability correctly, a brand new strategy of the 193-nm DUV laser era is presented based on the diamond Raman laser.