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As an example, The existing concave OC could get replaced by a airplane mirror which could mitigate the power density within the surface of M1 and the diamond. What's more, working with superior destruction threshold coatings for M1 and diamond would also Increase the output power with none damages. Then, the NIR laser within the 2nd Stokes wavelength may be superior plenty of, and its good beam good quality, to produce the ultimate DUV laser at 193 nm with a substantial common electric power.
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LBO is usually a wonderful nonlinear crystal which is usually applied to the SHG with the NIR into the environmentally friendly. The DUV laser is frequently understood by two levels of SFG during the LBO crystals because there isn't a stage-matching angle for LBO to transform the environmentally friendly laser at 515 nm or 532 nm to the DUV directly by SHG [sixteen]. Recently, the NSBBF crystal has also shown its possible to acquire a large conversion efficiency from 532 nm to 266 nm. The wander-off angle and deff on the NSBBF are Virtually just like those of CLBO [17].
On the opposite aspect, the power scaling with the NIR laser is yet another component to improve the regular electric power on the 193-nm DUV laser. Mainly because of the lack of the high-energy amplification Answer in the NIR laser (as an example at 1553 nm), nonlinear frequency procedures which include optical parameter oscillation (OPO) may be applied to create a wavelength converter by shifting the wavelength from one μm to the desired wavelength as well as obtaining relative higher power [21]. A short while ago, a diamond Raman laser showed its potential in accomplishing a superior electrical power and a significant conversion performance at the 1st Stokes of the one-μm laser [22,23], which means the chance to become utilized inside the 193-nm DUV laser era due to its large Raman achieve and enormous frequency shift.
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From the scientific and industrial purposes, the beam top quality of your DUV laser is also a crucial parameter. Particularly, the beam high-quality on the DUV laser radically has an effect on the laser machining success. The beam high-quality with the DUV laser is set by that of the elemental laser as well as crystal for that frequency conversion. Just lately, a significant-electricity DUV laser (>10 W) at 258 nm was documented using a beam high-quality of M2 < 1.five, which was produced by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would lead to a far better laser machining consequence when compared to the earlier DUV lasers with bigger M2.
The heartbeat length of the next Stokes gentle was shortened to 5 ns as proven in Figure 7a, a single-shot photo from your oscilloscope, which is a typical phenomenon in Raman laser [forty four] while the pulse period with the pump laser was ten ns.
Furthermore, combining the reliable-state laser with other nonlinear method like stimulated Raman scattering, NIR lasers read more could be reached at new wavelengths with superior power and high beam good quality, which was tested from the proof-of-basic principle experiment. This Raman laser plan provides a new path to the superior-energy DUV laser, Particularly on the wavelength of 193 nm.
Tunable ultraviolet laser source according to sound-state dye laser technological innovation and CsLiB6O10 harmonic era
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