All-sound-condition ultraviolet lasers are already broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medicine for some great benefits of modest volume, extended lifestyle, large effectiveness, excellent beam top quality, broad tuning and slim spectral line, and many others. Utilizing superior electric power around-infrared coherent light supply as the fundamental frequency supply depending on nonlinear tuning technological innovation, producing ultraviolet coherent radiation by multistage frequency conversion is considered to be an important strategy to create the ultraviolet coherent gentle resource.
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We summarized the current development status of your significant-electrical power DUV laser each for the wavelength of FHG in the one-μm laser and at 193 nm. The current enhancement in the good-state/fiber laser, together with the nonlinear optical crystals, prompts not merely the standard energy and also the beam quality (coherence) in the DUV lasers to an unparalleled amount.
The key issue of ultraviolet coherent mild supply primarily focuses on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is amongst the problems for frequency transformation, so the growth, dimension, injury resistance, conversion efficiency and allowable parameter range of nonlinear optical crystal are required Increasingly more.
Conversely, the beam top quality of the higher electricity DUV laser would become even worse as a result of far more critical thermal and nonlinear consequences. For this reason, the frequency conversion processes should be cautiously intended to mitigate the aforementioned results. Thus, a substantial-energy DUV laser on the FHG of 1 μm with a very good beam high-quality may be attained and will be helpful for getting the shorter wavelength DUV lasers such as 193 nm by SFG.
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On the other side, the ability scaling on the NIR laser is another aspect to increase the ordinary electric power in the 193-nm DUV laser. Because of the not enough the large-power amplification Option from the NIR laser (such as at 1553 nm), nonlinear frequency processes for instance optical parameter oscillation (OPO) may be placed on build a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength as well as acquiring relative better power [21]. Not too long ago, a diamond Raman laser confirmed its skill in achieving a large electricity and also a superior conversion performance within the 1st Stokes of your one-μm laser [22,23], which means the likelihood to be used during the 193-nm DUV laser technology as a consequence of its significant Raman get and huge frequency shift.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear crystal which generates ultraviolet harmonics with the Nd:YAG fundamental laser wavelength. To be able to improve the damage threshold, small CLBO floor roughness, by ultra-precision machining, is necessary. Since the CLBO crystal has straightforward hydroscopic response and micro scratches in machining, ultra-exact machining from the CLBO crystal is a tricky specialized problem.
Tunable ultraviolet laser source based on solid-state dye laser technologies and CsLiB6O10 harmonic generation
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