New Step by Step Map For CLBO Crystal
New Step by Step Map For CLBO Crystal
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All-reliable-point out ultraviolet lasers happen to be broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medicine for some great benefits of compact quantity, prolonged everyday living, higher efficiency, good beam quality, vast tuning and narrow spectral line, and so on. Utilizing higher electrical power around-infrared coherent mild resource as the elemental frequency source according to nonlinear tuning engineering, building ultraviolet coherent radiation by multistage frequency conversion is viewed as a very important approach to establish the ultraviolet coherent mild resource.
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We summarized The existing enhancement position on the substantial-electricity DUV laser the two in the wavelength of FHG of the one-μm laser and at 193 nm. The recent enhancement on the strong-point out/fiber laser, in addition to the nonlinear optical crystals, prompts don't just the typical electric power but also the beam good quality (coherence) of your DUV lasers to an unprecedented stage.
The average power of your NIR laser nevertheless has the opportunity being improved to tens of watts including 70 W [26] If your double-move configuration can be used for the Yb:YAG SCF amplifier stage. Hence, If your conversion performance of 31% from NIR to DUV may very well be even now maintained at this bigger electric power problem, the standard output electrical power with the DUV laser at 258 nm could be over twenty W, which would be described as a remarkable energy degree for your DUV laser and bring about the unanticipated DUV laser machining final results. Also, for top-electric power DUV laser, the UV damage from the nonlinear crystal, including the windows for CLBO crystal along with the mirrors, is another significant parameter for long run and stable Procedure.
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On the other aspect, the facility scaling on the NIR laser is another part to boost the ordinary ability on the 193-nm DUV laser. Because of the deficiency of the high-electrical power amplification Option of the NIR laser (by way of example at 1553 nm), nonlinear frequency procedures for instance optical parameter oscillation (OPO) could be applied to establish a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength in addition to obtaining relative higher electric power [21]. Not too long ago, a diamond Raman laser confirmed its ability in accomplishing a significant power as well as a substantial conversion effectiveness for the 1st Stokes of your one-μm laser [22,23], which means the possibility to become applied inside the 193-nm DUV laser generation as a result of its large Raman obtain and large frequency shift.
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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 basic laser wavelength. So that you can enhance the destruction threshold, minimal CLBO surface roughness, by extremely-precision machining, is required. Because the CLBO crystal has easy hydroscopic response and micro scratches in machining, ultra-precise machining on the CLBO crystal is a complicated technological dilemma.
The beam profile demonstrated in Figure 7b demonstrated 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 successful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about CLBO Crystal 2 times as massive as that of KDP. CLBO crystals could be grown within the stoichiometric melt with reduce viscosity.
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