All-sound-condition ultraviolet lasers are already commonly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of small quantity, extensive lifestyle, higher efficiency, excellent beam excellent, wide tuning and slender spectral line, and many others. Using higher electrical power close to-infrared coherent light-weight supply as the elemental frequency supply dependant on nonlinear tuning know-how, making ultraviolet coherent radiation by multistage frequency conversion is considered a crucial solution to create the ultraviolet coherent light source.
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Based on the evidence-of-theory experiment, the conversion efficiency of 23% implied the potential of obtaining superior-energy at the second Stokes wavelength from the Raman laser. In the event the pump laser of 1078 nm could possibly be received at the normal electric power of fifty W, the output energy of its 2nd Stokes wavelength at 1512 nm could possibly be a lot more than ten W. The design in the Raman laser cavity must be optimized so as to steer clear of the destruction with the M1 and diamond surface area.
The average ability in the NIR laser even now has the prospective to be improved to tens of watts such as 70 W [26] If your double-move configuration could be utilized with the Yb:YAG SCF amplifier stage. As a result, If your conversion efficiency of 31% from NIR to DUV may very well be continue to preserved at this greater ability ailment, the typical output energy with the DUV laser at 258 nm might be much more than 20 W, which would certainly be a impressive electricity amount for your DUV laser and bring about the unanticipated DUV laser machining benefits. Also, for top-ability DUV laser, the UV destruction of your nonlinear crystal, such as the windows for CLBO crystal along with the mirrors, is an additional essential parameter for long-term and secure Procedure.
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Each the 1040 nm and 1078 nm laser originate from one particular twin-wavelength Yb-doped fiber laser. Each individual laser is amplified by phases of fiber amplifier and Yb-doped resources amplifier, respectively.
On the opposite side, the power scaling of the NIR laser is yet another aspect to increase the average ability of your 193-nm DUV laser. Mainly because of the deficiency of the substantial-electrical power amplification Answer of your NIR laser (one example is at 1553 nm), nonlinear frequency processes such as optical parameter oscillation (OPO) could be applied to establish a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and obtaining relative better power [21]. Just lately, a diamond Raman laser confirmed its ability in attaining a significant power as well as a significant conversion effectiveness within the 1st Stokes of the 1-μm laser [22,23], which implies the possibility to get utilized during the 193-nm DUV laser technology due to its large Raman achieve and huge frequency shift.
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Moreover, combining the stable-point out laser with other nonlinear procedure for instance stimulated Raman scattering, NIR lasers may be attained at new wavelengths with high power and significant beam quality, which was examined by the evidence-of-basic principle experiment. This Raman laser plan offers a new route to the substantial-ability DUV laser, Particularly on the wavelength of 193 nm.
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The event in the 193-nm laser was shown by stages of SFG. So as to scale the DUV laser energy correctly, a fresh strategy from the 193-nm DUV laser era is introduced based on the diamond Raman laser.