All-stable-point out ultraviolet lasers have been greatly used in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of small quantity, prolonged daily life, large efficiency, good beam good quality, vast tuning and narrow spectral line, etc. Employing large ability in close proximity to-infrared coherent mild resource as the fundamental frequency source according to nonlinear tuning engineering, generating ultraviolet coherent radiation by multistage frequency conversion is viewed as an essential technique to develop the ultraviolet coherent gentle source.
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Based on the proof-of-principle experiment, the conversion efficiency of 23% implied the potential of accomplishing high-electrical power at the next Stokes wavelength with the Raman laser. Should the pump laser of 1078 nm could be obtained at the average ability of fifty W, the output electric power of its 2nd Stokes wavelength at 1512 nm can be in excess of ten W. The look from the Raman laser cavity really should be optimized so as to avoid the hurt in the M1 and diamond surface area.
The normal electricity in the NIR laser continue to has the probable to get improved to tens of watts which include 70 W [26] In case the double-pass configuration might be used for that Yb:YAG SCF amplifier stage. As a result, In case the conversion performance of 31% from NIR to DUV could possibly be still preserved at this higher electrical power ailment, the standard output electricity of the DUV laser at 258 nm may be much more than 20 W, which would become a amazing ability level for the DUV laser and result in the unanticipated DUV laser machining final results. Furthermore, for high-energy DUV laser, the UV harm from the nonlinear crystal, including the Home windows for CLBO crystal plus the mirrors, is an additional critical parameter for long lasting and stable Procedure.
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Both equally the 1040 nm and 1078 nm laser originate from a single dual-wavelength Yb-doped fiber laser. Each laser is amplified by levels of fiber amplifier and Yb-doped resources amplifier, respectively.
On one other facet, the facility scaling on the NIR laser is another element to increase the ordinary electric power in the 193-nm DUV laser. Due to the deficiency of the large-power amplification Option from the NIR laser (such as at 1553 nm), nonlinear frequency procedures including optical parameter oscillation (OPO) may very well be placed on make a wavelength converter by shifting the wavelength from one μm to the desired wavelength together with obtaining relative higher ability [21]. Just lately, a diamond Raman laser showed its capability in attaining a significant energy plus a higher conversion efficiency on the 1st Stokes on the 1-μm laser [22,23], which means the likelihood to generally be applied inside the 193-nm DUV laser generation thanks to its large Raman get and huge frequency change.
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Its UV absorption edge reaches one hundred eighty nm. The successful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about twice as significant as that of KDP. CLBO crystals might be grown within the stoichiometric soften with reduce viscosity.
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