All-solid-state ultraviolet lasers happen to be widely Utilized in the fields of mechanical flaw detection, lithography, micromachining and medicine for some great benefits of compact quantity, prolonged lifestyle, superior performance, very good beam excellent, huge tuning and slender spectral line, and so forth. Making use of significant ability in the vicinity of-infrared coherent light-weight supply as the fundamental frequency source dependant on nonlinear tuning know-how, generating ultraviolet coherent radiation by multistage frequency conversion is viewed as an essential solution to build the ultraviolet coherent light source.

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Based on the proof-of-theory experiment, the conversion performance of 23% implied the potential for achieving substantial-power at the second Stokes wavelength from the Raman laser. In case the pump laser of 1078 nm may very well be received at the standard electrical power of fifty W, the output power of its 2nd Stokes wavelength at 1512 nm could possibly be over ten W. The design in the Raman laser cavity needs to be optimized in an effort to stay away from the hurt in the M1 and diamond area.

As an example, The existing concave OC could be replaced by a aircraft mirror which could mitigate the power density within the floor of M1 as well as the diamond. Moreover, utilizing higher harm threshold coatings for M1 and diamond would also Enhance the output electric power with no damages. Then, the NIR laser with the 2nd Stokes wavelength could be high sufficient, along with its superior beam top quality, to crank out the final DUV laser at 193 nm by using a high ordinary power.

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Mainly because of the thermal lens impact within the reliable-condition lasers, Should the heating management is inadequate, It's not necessarily quick to obtain the strong-state laser having a higher electrical power along with a high beam top quality simultaneously. Not long ago, with the development of the thin disk laser and one-crystal fiber (SCF) laser, a significant-ability laser at the elemental wavelength (one μm) had been understood with a superb beam excellent Despite a TEM00 method beam [4,24], which might be good candidates for the basic of your DUV laser technology. One more applicant for the basic may be the higher-energy fiber laser which may be obtained by coherent beam blend with M2 price under one.

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Inside the scientific and industrial programs, the beam top quality with the DUV laser is usually a very important parameter. Especially, the beam high quality from the DUV laser significantly affects the laser machining success. The beam excellent in the DUV laser is set by that of the fundamental laser as well as crystal for that frequency conversion. Not too long ago, a higher-ability DUV laser (>ten W) at 258 nm was described having a beam good quality of M2 < one.5, which was produced by FHG of the Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This CLBO Crystal laser would bring on a greater laser machining end result compared to the preceding DUV lasers with larger M2.

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The beam profile shown in Figure 7b demonstrated a fantastic beam quality as one of many merits of Raman laser, which would be effective to make a 193-nm DUV laser with a top quality beam.

Its UV absorption edge reaches one hundred eighty nm. The successful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about 2 times as substantial as that of KDP. CLBO crystals could be developed through the stoichiometric melt with lessen viscosity.

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