Within this paper, the new lapping slurry and polishing slurry are introduced. And also the deliquescence diploma of CLBO is fallen to least expensive. A completely new Functioning know-how can be adopted. Right after rough sharpening, the concentration of extremely-precision polishing slurry is enhanced effectively. So does the ultra-precision sprucing pace, plus the wiping pace is quicker when compared to the deliquescence pace. The CLBO crystal surface roughness can realize 1nm and keep the area excellent very well. Access as a result of your establishment
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As an illustration, the current concave OC could be replaced by a plane mirror which could mitigate the power density around the area of M1 along with the diamond. Furthermore, using superior hurt threshold coatings for M1 and diamond would also Enhance the output energy with none damages. Then, the NIR laser with the 2nd Stokes wavelength could possibly be high plenty of, along with its good beam excellent, to produce the ultimate DUV laser at 193 nm using a significant normal power.
Then again, the beam high quality of the increased power DUV laser would develop into worse as a consequence of far more serious thermal and nonlinear results. Hence, the frequency conversion processes need to be very carefully designed to mitigate the aforementioned consequences. Thus, a substantial-electric power DUV laser within the FHG of one μm with a good beam high-quality could be attained and can be useful for acquiring the shorter wavelength DUV lasers for instance 193 nm by SFG.
LBO is additionally a superb nonlinear crystal which is usually placed on the SHG from your NIR to your inexperienced. The DUV laser is normally realized by two levels of SFG within the LBO crystals given that there is not any phase-matching angle for LBO to convert the inexperienced laser at 515 nm or 532 nm for the DUV straight by SHG [16]. Not long ago, the NSBBF crystal has also demonstrated its likely to acquire a high conversion performance from 532 nm to 266 nm. The wander-off angle and deff of your NSBBF are almost comparable to Those people of CLBO [seventeen].
On the opposite side, the ability scaling of the NIR laser is another element to boost the average ability with the 193-nm DUV laser. Due to lack of the superior-electricity amplification Remedy of your NIR laser (for instance at 1553 nm), nonlinear frequency procedures like optical parameter oscillation (OPO) could possibly be placed on build a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength together with obtaining relative greater ability [21]. Not long ago, a diamond Raman laser confirmed its potential in reaching a high electrical power as well as a high conversion performance for the 1st Stokes with the 1-μm laser [22,23], which suggests the possibility to generally be applied inside the 193-nm DUV laser technology on account of its superior Raman attain and huge frequency shift.
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During the scientific and industrial apps, the beam excellent of your DUV laser is likewise a very important parameter. Significantly, the beam good quality with the DUV laser dramatically influences the laser machining success. The beam top quality with the DUV laser is set by that of the elemental laser and also the crystal for the frequency conversion. Lately, a large-electrical power DUV laser (>10 W) at 258 nm was claimed by using a beam good quality of M2 < 1.5, which was generated by FHG of the Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would lead to a better laser machining final result when compared to the preceding DUV lasers with much larger M2.
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Also, combining the strong-state laser with other nonlinear process for instance stimulated Raman scattering, NIR lasers might be attained at new wavelengths with significant power and large beam quality, which was examined via the proof-of-principle experiment. This Raman laser scheme supplies get more info a completely new route to the significant-power DUV laser, In particular within the wavelength of 193 nm.
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Its UV absorption edge reaches one hundred eighty nm. The helpful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about 2 times as big as that of KDP. CLBO crystals is usually developed with the stoichiometric soften with reduced viscosity.
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