The 2-Minute Rule for CLBO Crystal
The 2-Minute Rule for CLBO Crystal
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All-stable-condition ultraviolet lasers have been widely Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of little volume, extended everyday living, high efficiency, good beam top quality, vast tuning and narrow spectral line, etcetera. Making use of large power close to-infrared coherent gentle source as the fundamental frequency supply determined by nonlinear tuning technological innovation, making ultraviolet coherent radiation by multistage frequency conversion is considered a significant technique to produce the ultraviolet coherent light-weight supply.
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The average electric power from the NIR laser nonetheless has the likely to get enhanced to tens of watts like 70 W [26] In case the double-move configuration might be utilized to the Yb:YAG SCF amplifier stage. Hence, When the conversion effectiveness of 31% from NIR to DUV may very well be however managed at this higher electric power situation, the normal output power of the DUV laser at 258 nm may very well be over twenty W, which might be described as a exceptional electrical power amount for your DUV laser and produce the unanticipated DUV laser machining outcomes. Additionally, for prime-power DUV laser, the UV hurt of the nonlinear crystal, such as the windows for CLBO crystal and also the mirrors, is another significant parameter for lasting and secure Procedure.
Then again, the beam high quality of the bigger electric power DUV laser would grow to be even worse on account of extra critical thermal and nonlinear outcomes. Hence, the frequency conversion processes needs to be very carefully created to mitigate the aforementioned effects. So, a large-electricity DUV laser with the FHG of one μm with a fantastic beam top quality may very well be attained and can be helpful for getting the shorter wavelength DUV lasers for instance 193 nm by SFG.
Both the 1040 nm and 1078 nm laser come from a person dual-wavelength Yb-doped fiber laser. Each laser is website amplified by stages of fiber amplifier and Yb-doped elements amplifier, respectively.
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In the scientific and industrial apps, the beam excellent with the DUV laser is likewise a very important parameter. Particularly, the beam quality of your DUV laser radically influences the laser machining final results. The beam high quality of your DUV laser is set by that of the fundamental laser plus the crystal for your frequency conversion. Recently, a significant-power DUV laser (>ten W) at 258 nm was claimed by using a beam high quality of M2 < one.5, which was produced by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [thirteen]. This laser would lead to an even better laser machining outcome compared to the earlier DUV lasers with larger sized M2.
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Additionally, combining the strong-state laser with other nonlinear course of action like stimulated Raman scattering, NIR lasers may be reached at new wavelengths with substantial electric power and superior beam high quality, which was examined with the proof-of-theory experiment. This Raman laser scheme provides a brand new path to the superior-ability DUV laser, especially within the wavelength of 193 nm.
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The conversion efficiency from elementary NIR to DUV is from five% to 36% in accordance with the noted ends in Desk 1. Raising the conversion efficiency will reduce the load on the look and setup of the basic laser amplifier as well as the electrical ability use. A good beam top quality of the basic laser may even lead on the raising of your conversion performance and the right ability depth on the NIR and inexperienced laser while in the SHG and FHG approach, respectively. The highest conversion efficiencies from NIR to eco-friendly and eco-friendly to DUV laser by usage of CLBO crystal are 70% and all-around 50%, respectively [twelve], which corresponds to your conversion effectiveness of 35% from basic to DUV.
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