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For instance, The existing concave OC could be replaced by a plane mirror which could mitigate the ability density within the surface of M1 as well as diamond. Additionally, making use of higher destruction threshold coatings for M1 and diamond would also Enhance the output electrical power with none damages. Then, the NIR laser on the 2nd Stokes wavelength could possibly be large ample, along with its superior beam high quality, to crank out the ultimate DUV laser at 193 nm having a superior regular power.
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Because of the thermal lens effect while in the good-condition lasers, In the event the heating administration is insufficient, It isn't quick to get the stable-state laser which has a large electrical power in addition to a substantial beam high-quality simultaneously. Not long ago, with the event of the thin disk laser and single-crystal fiber (SCF) laser, a significant-power laser at the fundamental wavelength (1 μm) had been realized with a superb beam high-quality even with a TEM00 mode beam [4,24], which might be excellent candidates for the basic with the DUV laser technology. A further prospect for the elemental is the high-electric power fiber laser which may very well be obtained by coherent beam blend with M2 price a lot less than 1.
On the other side, the facility scaling on the NIR laser is an additional element to increase the ordinary electric power on the 193-nm DUV laser. Due to the deficiency of the large-power amplification Resolution from the NIR laser (for example at 1553 nm), nonlinear frequency processes like optical parameter oscillation (OPO) may very well be applied to make a wavelength converter by shifting the wavelength from one μm to the desired wavelength and also getting relative higher electrical power [21]. Not long ago, a diamond Raman laser confirmed its capability in obtaining a significant energy and also a significant conversion efficiency on the 1st Stokes on the 1-μm laser [22,23], which suggests the possibility for being applied inside the 193-nm DUV laser generation because of its high Raman gain and enormous frequency change.
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From the scientific and industrial apps, the beam good quality on the DUV laser is likewise a vital parameter. Significantly, the beam excellent on the DUV laser drastically affects the laser machining success. The beam excellent in the DUV laser is determined by that of the basic laser and also the crystal with the frequency conversion. Just lately, a significant-electrical power DUV laser (>ten W) at 258 nm was noted that has a beam top quality of M2 < one.five, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would bring about a far better laser machining outcome when compared to the previous DUV lasers with greater M2.
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Tunable ultraviolet laser source based on strong-state dye laser technologies and CsLiB6O10 harmonic generation
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