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The important thing trouble of ultraviolet coherent light source largely concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal has become the circumstances for frequency transformation, so the growth, sizing, destruction resistance, conversion performance and allowable parameter selection of nonlinear optical crystal are needed A growing number of.
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Both equally the 1040 nm and 1078 nm laser originate from one particular twin-wavelength Yb-doped fiber laser. Just about every laser is amplified by phases of fiber amplifier and Yb-doped components amplifier, respectively.
On one other aspect, the power scaling of the NIR laser is yet another part to raise the typical power with the 193-nm DUV laser. Due to the lack of the superior-electric power amplification Option in the NIR laser (for instance at 1553 nm), nonlinear frequency procedures like optical parameter oscillation (OPO) can be applied to establish a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength as well as acquiring relative better power [21]. Not long ago, a diamond Raman laser confirmed its capability in achieving a higher electricity and also a higher conversion efficiency on the 1st Stokes in the one-μm laser [22,23], which suggests the chance being applied from the 193-nm DUV laser era thanks to its high Raman gain and enormous frequency change.
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Also, combining the strong-condition laser with other nonlinear course of action like stimulated Raman scattering, NIR lasers could be reached at new wavelengths with superior energy and large beam good quality, which was examined because of the evidence-of-basic principle experiment. This Raman laser plan supplies a different path to the substantial-electricity DUV laser, In particular for the wavelength of 193 nm.
The beam profile shown in Figure 7b demonstrated a great beam excellent as among the merits of Raman laser, which might be valuable to deliver a 193-nm DUV laser with a top quality beam.
Its UV absorption edge reaches one hundred eighty nm. The efficient nonlinear optical coefficient here of CLBO for frequency doubling at 1064nm is about 2 times as substantial as that of KDP. CLBO crystals might be grown with the stoichiometric melt with lessen viscosity.
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