Indicators on CLBO Crystal You Should Know
Indicators on CLBO Crystal You Should Know
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All-good-point out ultraviolet lasers have been widely used in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of smaller quantity, very long everyday living, superior performance, fantastic beam high-quality, large tuning and slender spectral line, and many others. Employing substantial energy close to-infrared coherent light-weight source as the basic frequency source dependant on nonlinear tuning technological know-how, creating ultraviolet coherent radiation by multistage frequency conversion is regarded as a significant solution to develop the ultraviolet coherent gentle resource.
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By way of example, The present concave OC could get replaced by a aircraft mirror which could mitigate the power density within the surface of M1 as well as the diamond. Furthermore, using significant injury threshold coatings for M1 and diamond would also Increase the output energy with none damages. Then, the NIR laser within the 2nd Stokes wavelength may very well be large adequate, along with its good beam excellent, to create the ultimate DUV laser at 193 nm with a higher regular power.
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Each the 1040 nm and 1078 nm laser originate from a person twin-wavelength Yb-doped fiber laser. Each individual laser is amplified by levels of fiber amplifier and Yb-doped elements amplifier, respectively.
On another side, the facility scaling with the NIR laser is an additional element to increase the typical power with the 193-nm DUV laser. Due to insufficient the superior-electric power amplification Remedy of your NIR laser (for instance at 1553 nm), nonlinear frequency processes including optical parameter oscillation (OPO) might be placed on build a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength as well as acquiring relative higher electricity [21]. A short while ago, a diamond Raman laser showed its capacity in acquiring a high power as well as a significant conversion efficiency with the 1st Stokes on the one-μm laser [22,23], which suggests the chance being used from the 193-nm DUV laser technology as a consequence of its superior Raman attain and enormous frequency shift.
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From the scientific and industrial purposes, the beam high-quality of the DUV laser can also be a crucial parameter. Specifically, the beam good quality on the DUV laser substantially impacts the laser machining outcomes. The beam excellent on the DUV laser is determined by that of the elemental laser along with the crystal for your frequency conversion. Not long ago, a large-power DUV laser (>10 W) at 258 nm was claimed by using a beam quality of M2 < 1.five, which was created by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [thirteen]. This laser would result in an even better laser machining outcome as compared to the prior DUV lasers with greater M2.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the most effective non-linear crystal which generates ultraviolet harmonics of the Nd:YAG fundamental laser wavelength. To be able to improve the damage threshold, low CLBO area roughness, by extremely-precision machining, is needed. As the CLBO crystal has effortless hydroscopic reaction and micro scratches in machining, ultra-specific machining on the CLBO crystal is actually a difficult complex problem.
The beam profile revealed in Determine 7b shown a superb beam high-quality as among the merits of Raman laser, which would be advantageous to create a 193-nm DUV laser with a high quality beam.
Its UV absorption edge reaches one hundred eighty nm. The powerful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about twice as large as that of KDP. CLBO crystals is usually grown in the stoichiometric soften with reduced viscosity.
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