All-stable-condition ultraviolet lasers are actually widely used in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of modest volume, lengthy existence, large performance, fantastic beam good quality, vast tuning and narrow spectral line, etcetera. Making use of high electrical power in the vicinity of-infrared coherent light-weight supply as the fundamental frequency resource dependant on nonlinear tuning technology, building ultraviolet coherent radiation by multistage frequency conversion is considered a crucial approach to develop the ultraviolet coherent mild supply.
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We summarized The existing improvement status of your superior-electrical power DUV laser the two in the wavelength of FHG of the one-μm laser and at 193 nm. The latest advancement of your sound-state/fiber laser, and also the nonlinear optical crystals, prompts not just the typical ability but in addition the beam high-quality (coherence) from the DUV lasers to an unprecedented degree.
The normal power in the NIR laser nonetheless has the potential to generally be enhanced to tens of watts like 70 W [26] if the double-move configuration might be utilized for your Yb:YAG SCF amplifier phase. That's why, In the event the conversion efficiency of 31% from NIR to DUV can be even now maintained at this better power condition, the common output ability from the DUV laser at 258 nm may very well be more than twenty W, which might be a impressive electric power amount for that DUV laser and bring about the unanticipated DUV laser machining outcomes. Also, for top-electric power DUV laser, the UV harm in the nonlinear crystal, including the windows for CLBO crystal along with more info the mirrors, is an additional significant parameter for long run and steady operation.
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LBO is additionally a fantastic nonlinear crystal which is usually applied to the SHG in the NIR for the eco-friendly. The DUV laser is frequently understood by two levels of SFG inside the LBO crystals considering the fact that there's no period-matching angle for LBO to transform the environmentally friendly laser at 515 nm or 532 nm towards the DUV immediately by SHG [16]. A short while ago, the NSBBF crystal has also demonstrated its likely to get a substantial conversion effectiveness from 532 nm to 266 nm. The walk-off angle and deff from the NSBBF are Nearly comparable to Those people of CLBO [seventeen].
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Moreover, combining the stable-state laser with other nonlinear course of action including stimulated Raman scattering, NIR lasers may very well be attained at new wavelengths with superior electricity and large beam excellent, which was analyzed with the evidence-of-principle experiment. This Raman laser plan provides a brand new route to the large-electric power DUV laser, Primarily for the wavelength of 193 nm.
The beam profile shown in Figure 7b demonstrated an excellent beam good quality as on the list of merits of Raman laser, which would be helpful to generate a 193-nm DUV laser with a high quality beam.
Its UV absorption edge reaches a hundred and eighty nm. The productive nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about two times as big as that of KDP. CLBO crystals can be grown within the stoichiometric soften with lessen viscosity.
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