All-stable-point out ultraviolet lasers have been widely Employed in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of smaller quantity, extensive everyday living, significant effectiveness, excellent beam good quality, extensive tuning and slim spectral line, and so forth. Employing significant ability in close proximity to-infrared coherent light resource as the fundamental frequency resource determined by nonlinear tuning technological innovation, generating ultraviolet coherent radiation by multistage frequency conversion is regarded as a very important strategy to develop the ultraviolet coherent mild supply.
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The standard electric power on the NIR laser nevertheless has the possible to get improved to tens of watts which include 70 W [26] When the double-pass configuration might be used to the Yb:YAG SCF amplifier stage. As a result, If your conversion efficiency of 31% from NIR to DUV could be even now taken care of at this increased power affliction, the typical output electric power of the DUV laser at 258 nm could possibly be much more than twenty W, which might be considered a exceptional power level to the DUV laser and produce the unanticipated DUV laser machining final results. Also, for top-power DUV laser, the UV harm on the nonlinear crystal, including the windows for CLBO crystal along with the mirrors, is another vital parameter for long-term and secure operation.
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Both the 1040 nm and 1078 nm laser come from just one dual-wavelength Yb-doped fiber laser. Every laser is amplified by levels of fiber amplifier and Yb-doped components amplifier, respectively.
On another aspect, the ability scaling of the NIR laser is yet another element to enhance the regular power with the 193-nm DUV laser. As a result of deficiency of the higher-electric power amplification solution on the NIR laser (for instance at 1553 nm), nonlinear frequency processes such as optical parameter oscillation (OPO) may be placed on produce a wavelength converter by shifting the wavelength from one μm to the specified wavelength and obtaining relative larger electric power [21]. Recently, a diamond Raman laser showed its capacity in obtaining a significant ability and a higher conversion efficiency at the 1st Stokes on the one-μm laser [22,23], which implies the likelihood to get applied inside the 193-nm DUV laser generation as a result of its high Raman acquire and large frequency change.
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Also, combining the good-state laser with other nonlinear procedure for example stimulated Raman scattering, NIR lasers can be attained at new wavelengths with superior power and large beam excellent, which was analyzed because of the proof-of-principle experiment. This Raman laser scheme provides a brand new route to the higher-energy DUV laser, Particularly in the wavelength of 193 nm.
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