Examine This Report on CLBO Crystal
Examine This Report on CLBO Crystal
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We summarized the current enhancement standing of the superior-ability DUV laser equally at the wavelength of FHG with the 1-μm laser and at 193 nm. The modern improvement with the strong-condition/fiber laser, as well as the nonlinear optical crystals, prompts not merely the normal electrical power and also the beam quality (coherence) in the DUV lasers to an unparalleled stage.
The crucial element problem of ultraviolet coherent light source primarily focuses on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is one of the disorders for frequency transformation, so the growth, sizing, hurt resistance, conversion effectiveness and allowable parameter range of nonlinear optical crystal are necessary more and more.
However, the beam good quality of this increased electric power DUV laser would come to be worse on account of additional major thermal and nonlinear consequences. For this reason, the frequency conversion procedures needs to be very carefully created to mitigate the aforementioned effects. Thus, a superior-electric power DUV laser on the FHG of 1 μm with a very good beam good quality could possibly be attained and will be advantageous for acquiring the shorter wavelength DUV lasers like 193 nm by SFG.
As a result of thermal lens impact in the stable-state lasers, If your heating management is inadequate, It's not easy to get the good-state laser having a significant ability in addition to a higher beam high quality simultaneously. Not too long ago, with the event of the thin disk laser and solitary-crystal fiber (SCF) laser, a superior-electricity laser at the basic wavelength (1 μm) had been realized with a very good beam high quality In spite of a TEM00 mode beam [four,24], which might be superior candidates for the basic in the DUV laser technology. Yet another candidate for the basic is the substantial-electricity fiber laser which could possibly be accomplished by coherent beam mix with M2 worth lower than one.
On another facet, the power scaling with the NIR laser is yet another facet to enhance the regular electric power in the 193-nm DUV laser. Due to the insufficient the significant-energy amplification Resolution of your NIR laser (as an example at 1553 nm), nonlinear frequency procedures which include optical parameter oscillation (OPO) could be applied to create a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength along with getting relative greater electrical power [21]. A short while ago, a diamond Raman laser confirmed its capability in obtaining a superior power as well as a substantial conversion performance within the 1st Stokes of the 1-μm laser [22,23], which implies the possibility to get utilized while in the 193-nm DUV laser era as a consequence of its significant Raman get and huge frequency shift.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the simplest non-linear crystal which generates ultraviolet harmonics of your Nd:YAG fundamental laser wavelength. In an effort to improve the damage threshold, very low CLBO area roughness, by extremely-precision machining, is required. Because the CLBO crystal has straightforward hydroscopic reaction and micro scratches in machining, ultra-exact machining with the CLBO crystal is actually a challenging complex problem.
The beam profile revealed in Figure 7b demonstrated an excellent beam good quality as among the list of deserves of Raman laser, which would be useful to create a 193-nm DUV laser with a top 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 twice as large as that of KDP. CLBO crystals is usually grown from the stoichiometric soften with lower viscosity.
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