All-reliable-condition ultraviolet lasers are already extensively Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of smaller volume, prolonged everyday living, high efficiency, good beam top quality, extensive tuning and slim spectral line, and so on. Using higher power in the vicinity of-infrared coherent gentle resource as the elemental frequency supply depending on nonlinear tuning engineering, building ultraviolet coherent radiation by multistage frequency conversion is thought to be an important technique to build the ultraviolet coherent light source.
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The average power of the NIR laser however has the probable being improved to tens of watts including 70 W [26] When the double-go configuration could possibly be utilized with the Yb:YAG SCF amplifier stage. As a result, In case the conversion performance of 31% from NIR to DUV may be still preserved at this bigger electrical power ailment, the standard output energy of your DUV laser at 258 nm could be in excess of twenty W, which might be a impressive power level to the DUV laser and cause the unanticipated DUV laser machining effects. Also, for top-power DUV laser, the UV damage of the nonlinear crystal, such as the windows for CLBO crystal as well as the mirrors, is another essential parameter for long term and secure Procedure.
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Because of the thermal lens impact in the strong-state lasers, if the heating management is inadequate, It's not at all straightforward to acquire the sound-point out laser using a large power plus a high beam top quality at the same time. Not too long ago, with the event of The skinny disk laser and one-crystal fiber (SCF) laser, a significant-energy laser at the basic wavelength (one μm) were realized with a great beam excellent Despite having a TEM00 mode beam [four,24], which would be very good candidates for the elemental of your DUV laser technology. A further prospect for the elemental is definitely the high-power fiber laser which may very well be obtained by coherent beam blend with M2 worth less than one.
On one other aspect, the power scaling on the NIR laser is an additional element to boost the average power of your 193-nm DUV laser. Mainly because of the deficiency of the large-energy amplification Alternative with the NIR laser (by way of example at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) might be applied to establish a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and obtaining relative larger power [21]. Just lately, a diamond Raman laser confirmed its capability in accomplishing a high energy plus a significant conversion performance on the 1st Stokes with the one-μm laser [22,23], which means the chance to be applied within the 193-nm DUV laser generation thanks to its significant Raman get and huge frequency shift.
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The heartbeat duration of the 2nd Stokes gentle was shortened to five ns as demonstrated in Figure 7a, only one-shot image in the oscilloscope, which is a typical phenomenon in Raman laser [forty four] whilst the heartbeat period in the pump laser was ten ns.
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Tunable ultraviolet laser source determined by stable-point out dye laser technology and CsLiB6O10 harmonic generation
Its UV absorption edge reaches one hundred eighty nm. The successful nonlinear optical coefficient of CLBO for frequency doubling at click here 1064nm is about two times as big as that of KDP. CLBO crystals may be developed through the stoichiometric soften with decreased viscosity.
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