5 Simple Statements About CLBO Crystal Explained
5 Simple Statements About CLBO Crystal Explained
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The key issue of ultraviolet coherent mild supply mainly concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is amongst the circumstances for frequency transformation, so the growth, measurement, injury resistance, conversion efficiency and allowable parameter number of nonlinear optical crystal are needed An increasing number of.
On the other hand, the beam high-quality of the larger ability DUV laser would come to be worse resulting from more significant thermal and nonlinear outcomes. Hence, the frequency conversion processes needs to be meticulously meant to mitigate the aforementioned outcomes. Therefore, a substantial-electricity DUV laser for the FHG of 1 μm with a superb beam good quality may be acquired and will be advantageous for getting the shorter wavelength DUV lasers which include 193 nm by SFG.
Because of the thermal lens effect from the reliable-state lasers, Should the heating management is inadequate, It's not at all straightforward to acquire the stable-point out laser using a superior electric power as well as a superior beam quality concurrently. A short while ago, with the development of the thin disk laser and solitary-crystal fiber (SCF) laser, a significant-energy laser at the basic wavelength (1 μm) were understood with a good beam top quality In spite of a TEM00 manner beam [four,24], which would be very good candidates for the elemental of your DUV laser technology. A further prospect for the elemental is definitely the superior-electric power fiber laser which can be obtained by coherent beam blend with M2 price under 1.
On the other side, the power scaling of your NIR laser is an additional facet to boost the average ability on the 193-nm DUV laser. Because of the lack of the significant-electrical power amplification solution of your NIR laser (one example is at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) could be applied to establish a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and obtaining relative increased electricity [21]. Lately, a diamond Raman laser showed its capacity in accomplishing a high electricity and a large conversion performance within the 1st Stokes in the 1-μm laser [22,23], which suggests the chance being used from the 193-nm DUV laser generation as a result of its large Raman gain and enormous frequency shift.
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In the scientific and industrial purposes, the beam high-quality from the DUV laser is also an essential parameter. Particularly, the beam quality of your DUV laser considerably impacts the laser machining success. The beam high-quality with the DUV laser is determined by that of the elemental laser along with the crystal for the frequency conversion. Not long ago, a large-ability DUV laser (>10 W) at 258 nm was claimed using a beam quality of M2 < one.5, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would bring on a far better laser machining outcome compared to the earlier DUV lasers with much larger M2.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the best non-linear get more info crystal which generates ultraviolet harmonics of your Nd:YAG essential laser wavelength. As a way to enrich the damage threshold, small CLBO floor roughness, by ultra-precision machining, is needed. As the CLBO crystal has effortless hydroscopic response and micro scratches in machining, ultra-precise machining of your CLBO crystal is often a challenging technical challenge.
The beam profile revealed in Determine 7b shown a great beam top quality as among the list of deserves of Raman laser, which might be effective to deliver a 193-nm DUV laser with a top quality beam.
The conversion effectiveness from fundamental NIR to DUV is from five% to 36% based on the documented brings about Table one. Growing the conversion effectiveness will lessen the burden on the look and set up of the fundamental laser amplifier and also the electric electric power use. An excellent beam high-quality of the fundamental laser will even lead into the increasing in the conversion effectiveness together with the appropriate power intensity in the NIR and inexperienced laser from the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to inexperienced and inexperienced to DUV laser by utilization of CLBO crystal are 70% and close to 50%, respectively [twelve], which corresponds into the conversion performance of 35% from basic to DUV.
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