The best Side of CLBO Crystal
The best Side of CLBO Crystal
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All-solid-state ultraviolet lasers have been extensively used in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of compact quantity, prolonged life, higher efficiency, very good beam excellent, huge tuning and slender spectral line, and many others. Making use of substantial energy near-infrared coherent gentle source as the elemental frequency supply according to nonlinear tuning technological innovation, generating ultraviolet coherent radiation by multistage frequency conversion is viewed as a vital method to develop the ultraviolet coherent gentle resource.
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We summarized The existing improvement position in the superior-power DUV laser each within the wavelength of FHG from the 1-μm laser and at 193 nm. The current improvement from the good-condition/fiber laser, together with the nonlinear optical crystals, prompts don't just the normal electricity but in addition the beam good quality (coherence) from the DUV lasers to an unprecedented level.
The normal electricity of your NIR laser however has the potential being improved to tens of watts for example 70 W [26] When the double-move configuration might be utilized for that Yb:YAG SCF amplifier stage. Hence, If your conversion efficiency of 31% from NIR to DUV could possibly be nevertheless preserved at this increased electric power situation, the typical output electrical power of your DUV laser at 258 nm could be a lot more than twenty W, which might be described as a exceptional electricity stage with the DUV laser and bring on the unanticipated DUV laser machining final results. What's more, for high-power DUV laser, the UV hurt of your nonlinear crystal, such as the windows for CLBO crystal plus the mirrors, is another crucial parameter for lasting and secure Procedure.
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On the opposite aspect, the power scaling with the NIR laser is an additional component to boost the common power of your 193-nm DUV laser. Due to not enough the higher-electricity amplification Remedy of the NIR laser (for example at 1553 nm), nonlinear frequency processes like optical parameter oscillation (OPO) could be placed on produce a wavelength converter by shifting the wavelength from one μm to the specified wavelength together with obtaining relative better electricity [21]. Just lately, a diamond Raman laser showed its capacity in obtaining a high power more info plus a large conversion effectiveness in the 1st Stokes from the 1-μm laser [22,23], which implies the possibility to get used during the 193-nm DUV laser era thanks to its high Raman gain and huge frequency shift.
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Also, combining the strong-point out laser with other nonlinear procedure for example stimulated Raman scattering, NIR lasers may very well be obtained at new wavelengths with large electricity and significant beam excellent, which was analyzed because of the evidence-of-principle experiment. This Raman laser scheme gives a different route to the large-energy DUV laser, Particularly in the wavelength of 193 nm.
The beam profile revealed in Determine 7b shown a very good beam high-quality as among the deserves of Raman laser, which would be helpful to create a 193-nm DUV laser with a high quality beam.
The conversion effectiveness from fundamental NIR to DUV is from five% to 36% according to the claimed ends in Table 1. Increasing the conversion effectiveness will reduce the load on the look and setup of the elemental laser amplifier in addition to the electric powered electrical power intake. A fantastic beam high quality of the basic laser will likely contribute for the raising of the conversion efficiency along with the suitable power intensity of the NIR and green laser while in the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to inexperienced and inexperienced to DUV laser by utilization of CLBO crystal are 70% and all around 50%, respectively [12], which corresponds towards the conversion performance of 35% from essential to DUV.
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