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The normal power on the NIR laser nevertheless has the likely to become improved to tens of watts including 70 W [26] When the double-move configuration may be used with the Yb:YAG SCF amplifier phase. That's why, When the conversion effectiveness of 31% from NIR to DUV can be still managed at this higher energy situation, the typical output electrical power in the DUV laser at 258 nm may very well be more than twenty W, which might certainly be a extraordinary electricity stage to the DUV laser and bring about the unanticipated DUV laser machining results. Moreover, for top-electrical power DUV laser, the UV injury of the nonlinear crystal, such as the windows for CLBO crystal and the mirrors, is another crucial parameter for long-term and secure operation.
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As a result of thermal lens outcome from the reliable-state lasers, Should the heating management is inadequate, it is not uncomplicated to obtain the stable-state laser using a large electrical power and also a higher beam top quality at the same time. Recently, with the event of the thin disk laser and one-crystal fiber (SCF) laser, a here high-electrical power laser at the elemental wavelength (1 μm) were recognized with an excellent beam quality Despite having a TEM00 method beam [4,24], which would be very good candidates for the basic of the DUV laser generation. Yet another applicant for the elemental is the large-electric power fiber laser which might be obtained by coherent beam mixture with M2 value less than 1.
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In the scientific and industrial applications, the beam quality of the DUV laser can also be an essential parameter. Especially, the beam top quality from the DUV laser dramatically has an effect on the laser machining effects. The beam excellent in the DUV laser is determined by that of the basic laser and also the crystal with the frequency conversion. Recently, a significant-electrical power DUV laser (>ten W) at 258 nm was noted which has a beam top quality of M2 < one.five, which was generated by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [thirteen]. This laser would bring on a greater laser machining consequence in comparison with the past DUV lasers with bigger M2.
The pulse length of the second Stokes gentle was shortened to 5 ns as demonstrated in Determine 7a, one-shot photograph with the oscilloscope, which happens to be a standard phenomenon in Raman laser [44] while the heartbeat period with the pump laser was 10 ns.
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The beam profile revealed in Determine 7b shown a superb beam excellent as on the list of deserves of Raman laser, which might be useful to make a 193-nm DUV laser with a high quality beam.
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The event on the 193-nm laser was shown by levels of SFG. So that you can scale the DUV laser electricity effectively, a whole new principle of the 193-nm DUV laser generation is offered based upon the diamond Raman laser.