Even so, in order to procedure the crystal is incredibly State-of-the-art production techniques are expected. Because the dawn of this crystal, engaged on this challenge, we are actually the only corporation on earth which might be processed During this crystal.
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In accordance with the evidence-of-principle experiment, the conversion efficiency of 23% implied the possibility of attaining substantial-ability at the second Stokes wavelength with the Raman laser. If the pump laser of 1078 nm may be attained at the typical electric power of fifty W, the output ability of its 2nd Stokes wavelength at 1512 nm may very well be more than 10 W. The look on the Raman laser cavity must be optimized in an effort to stay away from the harm of the M1 and diamond area.
The normal electricity on the NIR laser even now has the prospective to be enhanced to tens of watts for example 70 W [26] In the event the double-go configuration may be utilized with the Yb:YAG SCF amplifier stage. As a result, When the conversion performance of 31% from NIR to DUV might be however taken care of at this bigger power problem, the common output electric power of the DUV laser at 258 nm can be much more than 20 W, which would be a extraordinary electricity level with the DUV laser and lead to the unanticipated DUV laser machining success. What's more, for high-power DUV laser, the UV destruction with the nonlinear crystal, such as the windows for CLBO crystal and also the mirrors, is another important parameter for long term and steady operation.
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Equally the 1040 nm and 1078 nm laser come from 1 twin-wavelength Yb-doped fiber laser. Each individual laser is amplified by phases of fiber amplifier and Yb-doped components amplifier, respectively.
On the opposite aspect, the power scaling of your NIR laser is an additional element to enhance the normal energy of the 193-nm DUV laser. Because of the not enough the high-electric power amplification Alternative of your NIR laser (by way of example at 1553 nm), nonlinear frequency procedures like optical parameter oscillation (OPO) may very well be applied to build a wavelength converter by shifting the wavelength from one μm to the specified wavelength in addition to acquiring relative better electric power [21]. Recently, a diamond Raman laser confirmed its skill in achieving a large electricity in addition to a high conversion efficiency in the 1st Stokes in the 1-μm laser [22,23], which implies the chance to become applied inside the 193-nm DUV laser generation as a result of its large Raman obtain and enormous frequency shift.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the most effective non-linear crystal which generates ultraviolet harmonics from the Nd:YAG fundamental laser wavelength. To be able to greatly enhance the damage threshold, low CLBO floor roughness, by ultra-precision machining, is needed. As the CLBO crystal has effortless hydroscopic response and micro scratches in machining, extremely-precise machining of your CLBO crystal can be a hard technical trouble.
The beam profile proven in Figure 7b shown a fantastic beam quality as one of many merits click here of Raman laser, which might be helpful to crank out a 193-nm DUV laser with a top quality beam.
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