A Secret Weapon For CLBO Crystal
A Secret Weapon For CLBO Crystal
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All-sound-condition ultraviolet lasers are broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of tiny volume, extended daily life, large efficiency, great beam high-quality, vast tuning and narrow spectral line, and many others. Employing significant electric power in the vicinity of-infrared coherent light-weight supply as the fundamental frequency resource determined by nonlinear tuning know-how, producing ultraviolet coherent radiation by multistage frequency conversion is viewed as an essential technique to create the ultraviolet coherent light-weight source.
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According to the proof-of-theory experiment, the conversion effectiveness of 23% implied the opportunity of reaching substantial-electric power at the 2nd Stokes wavelength on the Raman laser. Should the pump laser of 1078 nm could possibly be received at the normal electricity of fifty W, the output power of its 2nd Stokes wavelength at 1512 nm may very well be greater than ten W. The look of your Raman laser cavity need to be optimized so that you can stay away from the injury of the M1 and diamond area.
The common electric power with the NIR laser however has the likely for being enhanced to tens of watts for instance 70 W [26] In the event the double-go configuration may be used for that Yb:YAG SCF amplifier phase. That's why, When the conversion effectiveness of 31% from NIR to DUV might be still taken care of at this increased energy affliction, the typical output ability from the DUV laser at 258 nm can be in excess of twenty W, which would become a exceptional energy degree to the DUV laser and bring on the unanticipated DUV laser machining success. What's more, for top-energy DUV laser, the UV hurt of your nonlinear crystal, such as the Home windows for CLBO crystal along with the mirrors, is an additional critical parameter for long-lasting and stable Procedure.
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On the other aspect, the power scaling of your NIR laser is an additional aspect to improve the ordinary electrical power with 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) may very well be placed on produce a wavelength converter by shifting the wavelength from one μm to the desired wavelength and also acquiring relative higher electricity [21]. Recently, a diamond Raman laser showed its skill in reaching a substantial ability along with a large conversion effectiveness in the 1st Stokes from the 1-μm laser [22,23], which implies the possibility for being used during the 193-nm DUV laser technology as a consequence of its superior Raman get and huge frequency shift.
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The heartbeat period of the second Stokes mild was shortened to five ns as revealed in Figure 7a, one-shot photograph from your oscilloscope, which happens to be a common phenomenon in Raman laser [forty four] though the heartbeat period of the pump laser was 10 ns.
Additionally, combining the good-point out laser with other nonlinear process for example stimulated Raman scattering, NIR lasers may very well be attained at new wavelengths with significant electric power and superior beam quality, which was examined with the proof-of-theory experiment. This Raman laser scheme gives a fresh path to the substantial-electricity DUV laser, Specially with the wavelength of 193 nm.
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The conversion performance from fundamental NIR to DUV is from 5% to 36% based on the noted results in Desk one. Rising the conversion performance will decrease the stress on the look and set up of the basic laser amplifier as well as the electrical power usage. A superb beam good quality of the elemental laser will also add for the rising of your conversion efficiency and also the suitable electricity depth with the NIR and environmentally friendly laser from the SHG and FHG process, respectively. The highest conversion efficiencies from NIR to inexperienced and green to DUV laser by utilization of CLBO crystal are 70% and all over 50%, respectively [12], which corresponds for the conversion efficiency of 35% from elementary to DUV.
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