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Based on the proof-of-principle experiment, the conversion efficiency of 23% implied the possibility of reaching large-electrical power at the second Stokes wavelength from the Raman laser. When the pump laser of 1078 nm might be attained at the common electric power of fifty W, the output electrical power of its 2nd Stokes wavelength at 1512 nm might be greater than ten W. The design on the Raman laser cavity must be optimized in an effort to stay away from the injury from the M1 and diamond surface.
The important thing difficulty of ultraviolet coherent mild source mostly concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is without doubt one of the ailments for frequency transformation, so The expansion, dimension, damage resistance, conversion performance and allowable parameter range of nonlinear optical crystal are demanded A lot more.
Alternatively, the beam high-quality of this increased energy DUV laser would turn into even worse resulting from a lot more major thermal and nonlinear effects. Consequently, the frequency conversion processes ought to be carefully created to mitigate the aforementioned outcomes. So, a superior-energy DUV laser with the FHG of one μm with a fantastic beam quality could possibly be acquired and may be helpful for acquiring the shorter wavelength DUV lasers for example 193 nm by SFG.
Due to thermal lens influence from the strong-point out lasers, Should the heating administration is insufficient, It's not straightforward to obtain the good-condition laser using a higher power and also a superior beam top quality at the same time. Just lately, with the development of The skinny disk laser and one-crystal fiber (SCF) laser, a higher-electric power laser at the fundamental wavelength (1 μm) were understood with an excellent beam high-quality In spite of a TEM00 manner beam [4,24], which might be good candidates for the basic of your DUV laser generation. One more candidate for the fundamental will be the higher-electric power fiber laser which could be reached by coherent beam mix with M2 worth a lot less than one.
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The conversion performance from basic NIR to DUV is from five% to 36% in accordance with the documented ends in Desk one. Expanding the conversion performance will lessen the stress on the look and set up of the basic laser amplifier and also the electric powered power consumption. A great beam high quality of the fundamental laser may also contribute to the growing of the conversion performance together with the suitable energy depth in the NIR and green laser within the SHG and FHG approach, respectively. The best conversion efficiencies from NIR to green and environmentally friendly to DUV laser by CLBO Crystal use of CLBO crystal are 70% and all-around 50%, respectively [twelve], which corresponds for the conversion performance of 35% from basic to DUV.
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