All-sound-point out ultraviolet lasers happen to be extensively used in the fields of mechanical flaw detection, lithography, micromachining and medicine for some great benefits of compact quantity, very long daily life, high efficiency, great beam high quality, wide tuning and slim spectral line, and so on. Utilizing higher energy in the vicinity of-infrared coherent light-weight resource as the basic frequency supply according to nonlinear tuning technologies, building ultraviolet coherent radiation by multistage frequency conversion is considered an important strategy to acquire the ultraviolet coherent light supply.
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We summarized The present advancement position on the higher-ability DUV laser both equally within the wavelength of FHG with the 1-μm laser and at 193 nm. The latest development on the sound-point out/fiber laser, together with the nonlinear optical crystals, prompts not just the standard electricity but will also the beam top quality (coherence) of your DUV lasers to an unprecedented stage.
As an illustration, The present concave OC could be replaced by a plane mirror which could mitigate the ability density within the surface area of M1 and also the diamond. Furthermore, using high problems threshold coatings for M1 and diamond would also improve the output electrical power with none damages. Then, the NIR laser with the 2nd Stokes wavelength might be significant more than enough, along with its superior beam good quality, to deliver the final DUV laser at 193 nm by using a high common ability.
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In the scientific and industrial purposes, the beam excellent of your DUV laser is also a significant parameter. Particularly, the beam good quality on the DUV laser drastically affects the laser machining effects. The beam good quality of the DUV laser is set by that of the fundamental laser as well as the crystal with the frequency conversion. Not too long ago, a superior-electrical power DUV laser (>ten W) at 258 nm was claimed having a beam good quality of M2 < one.five, which was created by FHG more info of a Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would bring about an even better laser machining final result in comparison with the preceding DUV lasers with much larger M2.
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The beam profile demonstrated in Determine 7b demonstrated a fantastic beam high quality as among the list of deserves of Raman laser, which might be advantageous to make a 193-nm DUV laser with a high quality beam.
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The development with the 193-nm laser was shown by stages of SFG. So as to scale the DUV laser energy effectively, a fresh strategy of the 193-nm DUV laser generation is offered based upon the diamond Raman laser.