Detailed Notes on CLBO Crystal
Detailed Notes on CLBO Crystal
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All-strong-point out ultraviolet lasers have already been commonly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of small volume, prolonged lifetime, superior performance, good beam excellent, huge tuning and slim spectral line, etcetera. Employing significant electricity close to-infrared coherent light-weight supply as the elemental frequency source depending on nonlinear tuning technological know-how, generating ultraviolet coherent radiation by multistage frequency conversion is considered a crucial method to establish the ultraviolet coherent mild resource.
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The key problem of ultraviolet coherent light resource generally concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal has become the ailments for frequency transformation, so the growth, dimensions, hurt resistance, conversion efficiency and allowable parameter number of nonlinear optical crystal are essential A growing number of.
Alternatively, the beam excellent of this bigger power DUV laser would turn into even worse because of far more really serious thermal and nonlinear outcomes. That's why, the frequency conversion procedures really should be diligently built to mitigate the aforementioned outcomes. As a result, a large-energy DUV laser at the FHG of one μm with a very good beam excellent may be received and can be useful for obtaining the shorter wavelength DUV lasers which include 193 nm by SFG.
LBO can also be a superb nonlinear crystal which is usually placed on the SHG from your NIR to your inexperienced. The DUV laser is often recognized by two stages of SFG in the LBO crystals since there is not any period-matching angle for LBO to convert the environmentally friendly laser at 515 nm or 532 nm into the DUV instantly by SHG [sixteen]. Not long ago, the NSBBF crystal has also demonstrated its likely to obtain a superior conversion check here effectiveness from 532 nm to 266 nm. The walk-off angle and deff of the NSBBF are Virtually comparable to Individuals of CLBO [seventeen].
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While in the scientific and industrial applications, the beam quality with the DUV laser is additionally a vital parameter. Especially, the beam high-quality on the DUV laser dramatically influences the laser machining outcomes. The beam excellent from the DUV laser is set by that of the elemental laser as well as the crystal for that frequency conversion. Lately, a substantial-ability DUV laser (>10 W) at 258 nm was reported having 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 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 your Nd:YAG elementary laser wavelength. So as to greatly enhance the problems threshold, lower CLBO surface area roughness, by extremely-precision machining, is required. Because the CLBO crystal has uncomplicated hydroscopic reaction and micro scratches in machining, extremely-precise machining of your CLBO crystal can be a tough technical challenge.
The beam profile proven in Figure 7b demonstrated an excellent beam top quality as one of several merits of Raman laser, which would be beneficial 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 in the stoichiometric soften with reduce viscosity.
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