The Basic Principles Of CLBO Crystal
The Basic Principles Of CLBO Crystal
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All-stable-state ultraviolet lasers are already greatly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for some great benefits of compact quantity, long lifestyle, higher performance, fantastic beam excellent, extensive tuning and narrow spectral line, etcetera. Making use of large energy near-infrared coherent light source as the fundamental frequency resource determined by nonlinear tuning know-how, creating ultraviolet coherent radiation by multistage frequency conversion is thought to be an essential solution to build the ultraviolet coherent light-weight supply.
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The common ability of your NIR laser however has the likely for being improved to tens of watts for instance 70 W [26] In case the double-pass configuration can be utilized for that Yb:YAG SCF amplifier stage. Hence, If your conversion efficiency of 31% from NIR to DUV may very well be however taken care of at this bigger electricity problem, the standard output electricity of your DUV laser at 258 nm could be in excess of 20 W, which might become a impressive energy amount for that DUV laser and cause the unanticipated DUV laser machining outcomes. Furthermore, for top-electrical power DUV laser, the UV destruction of your nonlinear crystal, including the Home windows for CLBO crystal plus the mirrors, is an additional vital parameter for long run and stable operation.
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On another facet, the facility scaling in the NIR laser is yet another aspect to increase the ordinary ability of your 193-nm DUV laser. A result of the not enough the high-electricity amplification Resolution from the NIR laser (by way of example at 1553 nm), nonlinear frequency procedures including optical parameter oscillation (OPO) may be applied to build a wavelength converter by shifting the wavelength from one μm to the specified wavelength as well as obtaining relative larger electricity [21]. A short while ago, a diamond Raman laser confirmed its potential in accomplishing a large ability along with a significant conversion performance in the 1st Stokes on the one-μm laser [22,23], which means the chance to become applied while in the 193-nm DUV laser era as a result of its substantial Raman get and huge frequency shift.
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From the scientific and industrial apps, the beam excellent with the DUV laser is likewise a significant parameter. Particularly, the beam excellent on the DUV laser considerably influences the laser machining final results. The beam high quality of the DUV laser is decided by that of the basic laser and also the crystal for the frequency conversion. A short while ago, a significant-electrical power DUV laser (>ten W) at 258 nm was documented having a beam excellent of M2 < 1.5, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would bring on a greater laser machining consequence in comparison to the past DUV lasers with larger M2.
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Its UV absorption edge reaches 180 nm. The productive nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about two times as large as that of KDP. CLBO crystals is often grown with the stoichiometric melt with decreased viscosity.
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