All-good-condition ultraviolet lasers are actually broadly used in the fields of mechanical flaw detection, lithography, micromachining and medicine for the benefits of modest quantity, extensive existence, superior effectiveness, great beam good quality, wide tuning and narrow spectral line, etcetera. Making use of high electricity in the vicinity of-infrared coherent gentle source as the fundamental frequency supply based on nonlinear tuning technological innovation, making ultraviolet coherent radiation by multistage frequency conversion is regarded as a very important way to produce the ultraviolet coherent light-weight source.
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The common electrical power of the NIR laser nevertheless has the probable to become improved to tens of watts such as 70 W [26] When the double-move configuration may be used with the Yb:YAG SCF amplifier stage. Consequently, If your conversion effectiveness of 31% from NIR to DUV can be even now managed at this bigger power condition, the normal output electric power on the DUV laser at 258 nm could be more than 20 W, which might be described as a amazing electric power degree to the DUV laser and result in the unanticipated DUV laser machining outcomes. Additionally, for prime-electrical power DUV laser, the UV damage of your nonlinear crystal, including the Home windows for CLBO crystal as well as the mirrors, is yet another critical parameter for long term and secure Procedure.
Conversely, the beam top quality of this increased ability DUV laser would grow to be worse on account of far more really serious thermal and nonlinear outcomes. That's why, the frequency conversion processes needs to be very carefully made to mitigate the aforementioned effects. So, a significant-power DUV laser at the FHG of 1 μm with a very good beam quality might be received and can be beneficial for obtaining the shorter wavelength DUV lasers including 193 nm by SFG.
The two the 1040 nm and 1078 nm laser come from one particular dual-wavelength Yb-doped fiber laser. Every single laser is amplified by stages of fiber amplifier and Yb-doped supplies amplifier, respectively.
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While in the scientific and industrial apps, the beam good quality on the DUV laser can be a vital parameter. Specifically, the beam high-quality with the DUV laser substantially affects the laser machining success. The beam high-quality on the DUV laser is determined by that of the basic laser and also the crystal with the frequency conversion. Just lately, a high-electrical power DUV laser (>10 W) at 258 nm was documented with a beam good quality of M2 < one.5, which was created by FHG of the Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would bring on a better laser machining consequence in comparison to click here the preceding DUV lasers with larger sized M2.
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