The 2-Minute Rule for CLBO Crystal
The 2-Minute Rule for CLBO Crystal
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We summarized the current enhancement status of your superior-electrical power DUV laser both of those at the wavelength of FHG of your one-μm laser and at 193 nm. The latest progress on the strong-state/fiber laser, in addition to the nonlinear optical crystals, prompts not only the standard power but also the beam good quality (coherence) on the DUV lasers to an unprecedented degree.
The true secret dilemma of ultraviolet coherent gentle supply largely concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is among the ailments for frequency transformation, so The expansion, dimensions, destruction resistance, conversion effectiveness and allowable parameter number of nonlinear optical crystal are expected Progressively more.
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On the other aspect, the facility scaling from the NIR laser is yet another element to enhance the typical electric power of the 193-nm DUV laser. As a result of insufficient the superior-electric power amplification Remedy on the NIR laser (for example at 1553 nm), nonlinear frequency processes including optical parameter oscillation (OPO) may be placed on produce a wavelength converter by shifting the wavelength from one μm to the specified wavelength and getting relative bigger ability [21]. Not too long ago, a diamond Raman laser showed its capacity in accomplishing a significant electricity plus a large conversion performance for the 1st Stokes in the 1-μm laser [22,23], which implies the likelihood for CLBO Crystal being used while in the 193-nm DUV laser technology on account of its substantial Raman obtain and enormous frequency shift.
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Inside the scientific and industrial apps, the beam high-quality on the DUV laser can be an essential parameter. Specifically, the beam top quality from the DUV laser dramatically affects the laser machining results. The beam top quality on the DUV laser is determined by that of the elemental laser and the crystal to the frequency conversion. Not long ago, a significant-electrical power DUV laser (>10 W) at 258 nm was reported having a beam excellent of M2 < one.5, which was produced by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would bring on an even better laser machining result in comparison to the former DUV lasers with greater M2.
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The beam profile revealed in Figure 7b demonstrated a very good beam good quality as one of many deserves of Raman laser, which might be valuable to generate a 193-nm DUV laser with a high quality beam.
The conversion effectiveness from elementary NIR to DUV is from five% to 36% according to the noted results in Table 1. Escalating the conversion effectiveness will lessen the burden on the look and setup of the fundamental laser amplifier as well as the electric power consumption. A superb beam top quality of the elemental laser may even lead on the escalating of your conversion efficiency together with the right ability intensity from the NIR and inexperienced laser during the SHG and FHG procedure, respectively. The very best conversion efficiencies from NIR to eco-friendly and environmentally friendly to DUV laser by utilization of CLBO crystal are 70% and all-around 50%, respectively [12], which corresponds to your conversion performance of 35% from fundamental to DUV.
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