The smart Trick of CLBO Crystal That Nobody is Discussing
The smart Trick of CLBO Crystal That Nobody is Discussing
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All-sound-condition ultraviolet lasers have already been broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of tiny volume, extensive existence, higher efficiency, superior beam excellent, extensive tuning and narrow spectral line, etcetera. Making use of large energy near-infrared coherent gentle source as the basic frequency source dependant on nonlinear tuning technological know-how, making ultraviolet coherent radiation by multistage frequency conversion is thought to be a very important approach to build the ultraviolet coherent light-weight resource.
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We summarized The existing progress status of your substantial-energy DUV laser both of those at the wavelength of FHG with the 1-μm laser and at 193 nm. The new improvement of your solid-condition/fiber laser, along with the nonlinear optical crystals, prompts not merely the standard electrical power and also the beam excellent (coherence) on the DUV lasers to an unparalleled level.
As an illustration, the current concave OC could be replaced by a airplane mirror which could mitigate the power density to the surface of M1 plus the diamond. Furthermore, working with high hurt threshold coatings for M1 and diamond would also Enhance the output electrical power with no damages. Then, the NIR laser within the 2nd Stokes wavelength could possibly be substantial sufficient, and also its fantastic beam high-quality, to generate the ultimate DUV laser at 193 nm with a higher regular electric power.
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On one other aspect, the facility scaling in the NIR laser is yet another factor to increase the regular electrical power with the 193-nm DUV laser. A result of the not enough the superior-electric power amplification Option with the NIR laser (for example at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) may be placed on establish a wavelength converter by shifting the wavelength from one μm to website the specified wavelength as well as obtaining relative larger ability [21]. Recently, a diamond Raman laser showed its capacity in obtaining a significant electric power in addition to a superior conversion performance for the 1st Stokes on the 1-μm laser [22,23], which implies the chance being utilized inside the 193-nm DUV laser era as a result of its large Raman gain and enormous frequency shift.
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Within the scientific and industrial purposes, the beam excellent on the DUV laser can also be an important parameter. Specially, the beam top quality of the DUV laser considerably affects the laser machining effects. The beam quality with the DUV laser is determined by that of the basic laser and the crystal to the frequency conversion. Lately, a substantial-power DUV laser (>10 W) at 258 nm was noted that has a beam quality of M2 < 1.5, which was generated by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would result in an improved laser machining outcome as compared to the previous DUV lasers with bigger M2.
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The conversion effectiveness from essential NIR to DUV is from five% to 36% according to the described leads to Desk 1. Raising the conversion efficiency will decrease the stress on the design and set up of the elemental laser amplifier plus the electric powered electrical power intake. A great beam good quality of the elemental laser may also lead to your increasing on the conversion performance as well as the appropriate electrical power intensity on the NIR and inexperienced laser from the SHG and FHG process, respectively. The highest conversion efficiencies from NIR to eco-friendly and eco-friendly to DUV laser by use of CLBO crystal are 70% and about fifty%, respectively [twelve], which corresponds on the conversion effectiveness of 35% from basic to DUV.
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