All-sound-state ultraviolet lasers have already been commonly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the advantages of modest volume, extended existence, large efficiency, very good beam good quality, extensive tuning and narrow spectral line, etc. Utilizing superior power in the vicinity of-infrared coherent mild resource as the basic frequency source based on nonlinear tuning technological know-how, making ultraviolet coherent radiation by multistage frequency conversion is considered a vital approach to develop the ultraviolet coherent mild supply.
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We summarized The present improvement standing of the superior-energy DUV laser both of those within the wavelength of FHG in the one-μm laser and at 193 nm. The modern development with the strong-condition/fiber laser, together with the nonlinear optical crystals, prompts not merely the typical ability but in addition the beam high quality (coherence) with the DUV lasers to an unprecedented stage.
The real key difficulty of ultraviolet coherent mild source mostly focuses on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is among the situations for frequency transformation, so the growth, measurement, hurt resistance, conversion effectiveness and allowable parameter variety of nonlinear optical crystal are essential Progressively more.
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On the other facet, the power scaling on the NIR laser is an additional component to enhance the regular electricity from the 193-nm DUV laser. Because of the not enough the substantial-energy amplification Alternative on the NIR laser (for instance at 1553 nm), nonlinear frequency procedures for instance optical parameter oscillation (OPO) may be placed on develop a wavelength converter by shifting the wavelength from one μm to the desired wavelength and obtaining relative better electrical power [21]. Recently, a diamond Raman laser showed its skill in reaching a significant power as well as a significant conversion effectiveness at the 1st Stokes of your one-μm laser [22,23], which suggests the chance to generally be applied during the 193-nm DUV laser generation due to its high Raman attain and huge frequency shift.
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Within the scientific and industrial programs, the beam excellent with the DUV laser is likewise a significant parameter. Significantly, the beam high-quality with the DUV laser substantially has an effect on the laser machining benefits. The beam good quality in the DUV laser is decided by that of the basic laser as well as the crystal for the frequency conversion. A short while ago, a substantial-electricity DUV laser (>ten W) at 258 nm was documented having a beam high-quality of M2 < 1.five, which was created by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would result in an improved laser machining final result when compared with the former DUV lasers with bigger M2.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear crystal which generates ultraviolet harmonics with the Nd:YAG elementary laser wavelength. In an effort to increase the hurt threshold, minimal CLBO surface roughness, by extremely-precision machining, is required. Because the CLBO crystal has simple hydroscopic response and micro scratches in machining, extremely-precise machining of your CLBO crystal is usually a hard specialized problem.
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The event of the 193-nm laser was demonstrated by levels of SFG. As a way to scale the DUV laser ability efficiently, a get more info completely new idea with the 193-nm DUV laser technology is presented based upon the diamond Raman laser.