All-sound-condition ultraviolet lasers are already broadly used in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of little quantity, extensive life, superior performance, very good beam top quality, broad tuning and slim spectral line, and so forth. Making use of superior ability in close proximity to-infrared coherent mild resource as the basic frequency resource based upon nonlinear tuning engineering, generating ultraviolet coherent radiation by multistage frequency conversion is viewed as a vital approach to establish the ultraviolet coherent mild supply.
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The average ability with the NIR laser continue to has the probable for being improved to tens of watts for instance 70 W [26] If your double-pass configuration can be utilized with the Yb:YAG SCF amplifier stage. That's why, When the conversion effectiveness of 31% from NIR to DUV could possibly be still preserved at this higher electrical power condition, the typical output electric power from the DUV laser at 258 nm may be more than 20 W, which would become a extraordinary power level with the DUV laser and produce the unanticipated DUV laser machining final results. In addition, for high-electrical power DUV laser, the UV harm on the nonlinear crystal, such as the Home windows for CLBO crystal and the mirrors, is yet another essential parameter for long run and stable operation.
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The two the 1040 nm and 1078 nm laser originate from one particular dual-wavelength Yb-doped fiber laser. Just about every laser is amplified by stages of fiber amplifier and Yb-doped products amplifier, respectively.
On the other facet, the ability scaling in the NIR laser is another aspect to raise the common energy of your 193-nm DUV laser. Due to insufficient the high-electric power amplification Remedy of the NIR laser (one example is at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) could possibly be placed on build a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength together with getting relative greater electric power [21]. Recently, a diamond Raman laser showed its potential in acquiring a significant electrical power along with a significant conversion efficiency for the 1st Stokes on the one-μm laser [22,23], which means the likelihood being utilized during the 193-nm DUV laser technology because of its higher Raman gain and huge frequency shift.
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Moreover, combining the reliable-point out laser with other nonlinear procedure which include stimulated Raman scattering, NIR lasers could possibly be realized at new wavelengths with high electricity and significant beam quality, which was tested through the proof-of-basic principle experiment. This Raman laser scheme supplies a different path to the superior-energy DUV laser, Specifically on the wavelength of 193 nm.
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Its UV absorption edge reaches 180 nm. The efficient nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about 2 times as large as that of KDP. CLBO crystals might be developed within the stoichiometric soften with lower viscosity.
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