CLBO Crystal Fundamentals Explained
CLBO Crystal Fundamentals Explained
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All-reliable-condition ultraviolet lasers are widely Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of small quantity, very long everyday living, high performance, great beam quality, wide tuning and slender spectral line, and so on. Utilizing high power near-infrared coherent light-weight supply as the basic frequency source depending on nonlinear tuning know-how, making ultraviolet coherent radiation by multistage frequency conversion is considered to be a vital approach to acquire the ultraviolet coherent mild supply.
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We summarized The existing progress status with the high-power DUV laser both of those with the wavelength of FHG of the one-μm laser and at 193 nm. The new advancement of the stable-state/fiber laser, as well as the nonlinear optical crystals, prompts not merely the standard energy but will also the beam good quality (coherence) with the DUV lasers to an unparalleled amount.
The key issue of ultraviolet coherent mild source mostly focuses on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal has become the disorders for frequency transformation, so The expansion, dimensions, hurt resistance, conversion efficiency and allowable parameter array of nonlinear optical crystal are necessary A lot more.
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LBO is additionally an outstanding nonlinear crystal which is always applied to the SHG within the NIR for the environmentally friendly. The DUV laser is normally recognized by two phases of SFG during the LBO crystals because there isn't a section-matching angle for LBO to transform the inexperienced laser at 515 nm or 532 nm to your DUV instantly by SHG [sixteen]. Not long ago, the NSBBF crystal has also demonstrated its likely to get a large conversion efficiency from 532 nm to 266 nm. The wander-off angle and deff with the NSBBF are Practically just like These of CLBO [seventeen].
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Inside the scientific and industrial applications, the beam quality with the DUV laser can be an essential parameter. Especially, the beam high quality of the DUV laser dramatically influences the laser machining benefits. The beam top quality of the DUV laser is decided by that of the fundamental laser plus the crystal for your frequency conversion. Recently, a significant-electrical power DUV laser (>ten W) at 258 nm was noted by using a beam get more info good quality of M2 < one.five, which was generated by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [thirteen]. This laser would produce a much better laser machining consequence in comparison to the earlier DUV lasers with much larger 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 essential laser wavelength. In order to greatly enhance the problems threshold, small CLBO floor roughness, by ultra-precision machining, is needed. Since the CLBO crystal has straightforward hydroscopic reaction and micro scratches in machining, extremely-precise machining of your CLBO crystal can be a challenging technological dilemma.
The beam profile revealed in Determine 7b shown a great beam good quality as one of the merits of Raman laser, which would be helpful to produce a 193-nm DUV laser with a top quality beam.
Its UV absorption edge reaches one hundred eighty nm. The efficient nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about 2 times as massive as that of KDP. CLBO crystals may be developed from your stoichiometric soften with decrease viscosity.
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