5 Easy Facts About CLBO Crystal Described
5 Easy Facts About CLBO Crystal Described
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All-stable-point out ultraviolet lasers happen to be extensively used in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of smaller volume, very long everyday living, superior performance, very good beam top quality, broad tuning and slim spectral line, and many others. Utilizing superior electricity near-infrared coherent light-weight resource as the basic frequency source based upon nonlinear tuning technology, making ultraviolet coherent radiation by multistage frequency conversion is regarded as a significant technique to acquire the ultraviolet coherent light supply.
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We summarized The existing growth status with the substantial-energy DUV laser both of those with the wavelength of FHG in the one-μm laser and at 193 nm. The the latest progress on the strong-point out/fiber laser, plus the nonlinear optical crystals, prompts not just the standard electrical power but also the beam top quality (coherence) of your DUV lasers to an unparalleled amount.
As an example, The existing concave OC could get replaced by a aircraft mirror which could mitigate the power density around the surface of M1 and the diamond. Moreover, using superior problems threshold coatings for M1 and diamond would also Enhance the output electrical power with none damages. Then, the NIR laser in the 2nd Stokes wavelength can be substantial enough, together with its great beam excellent, to produce the final DUV laser at 193 nm that has a substantial regular electrical power.
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LBO is usually a superb nonlinear crystal which is often applied to the SHG through the NIR to the inexperienced. The DUV laser is usually realized by two stages of SFG from the LBO crystals given that there isn't a period-matching angle for LBO to transform the inexperienced laser at 515 nm or 532 nm on the DUV right by SHG [16]. Not too long ago, the NSBBF crystal has also demonstrated its likely to get a higher conversion effectiveness from 532 nm to 266 nm. The wander-off angle and deff with the NSBBF are Just about much like These of CLBO [seventeen].
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During the scientific and industrial purposes, the beam good quality with the DUV laser is additionally a crucial parameter. Especially, the beam quality of the DUV laser significantly affects the laser machining results. The beam excellent in the DUV laser is decided by that of the fundamental laser as well as crystal to the frequency conversion. Recently, a significant-ability DUV laser (>10 W) at 258 nm was noted by using a beam high-quality of M2 < one.five, which was generated by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [13]. This laser would cause a far better laser machining end result compared to the earlier DUV lasers with much larger M2.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the simplest non-linear crystal which generates ultraviolet harmonics with the Nd:YAG elementary laser wavelength. So as to enrich the problems threshold, reduced CLBO surface area roughness, by extremely-precision machining, is required. Because the CLBO crystal has easy hydroscopic response and micro scratches in get more info machining, ultra-precise machining with the CLBO crystal is usually a tricky specialized problem.
The beam profile proven in Determine 7b shown a great beam good quality as among the merits of Raman laser, which might be beneficial to produce 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 large as that of KDP. CLBO crystals is usually grown from the stoichiometric soften with reduce viscosity.
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