All-sound-state ultraviolet lasers are commonly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of little volume, long life, superior performance, superior beam high-quality, huge tuning and slim spectral line, etc. Making use of large energy around-infrared coherent light supply as the fundamental frequency supply depending on nonlinear tuning engineering, building ultraviolet coherent radiation by multistage frequency conversion is considered an important technique to create the ultraviolet coherent gentle supply.
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The main element dilemma of ultraviolet coherent light resource mainly concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is among the situations for frequency transformation, so the growth, size, harm resistance, conversion efficiency and allowable parameter range of nonlinear optical crystal are required Increasingly more.
Conversely, the beam good quality of the larger ability DUV laser would turn out to be even worse due to additional really serious thermal and nonlinear effects. Therefore, the frequency conversion processes must be diligently made to mitigate the aforementioned results. Consequently, a superior-power DUV laser in the FHG of 1 μm with a great beam good quality may be received and may be valuable for acquiring the shorter wavelength DUV lasers including 193 nm by SFG.
The two the 1040 nm and 1078 nm laser come from one twin-wavelength Yb-doped fiber laser. Just about every laser is amplified by phases of fiber amplifier and Yb-doped supplies amplifier, respectively.
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While in the scientific and industrial apps, the beam good quality in the DUV laser can be a significant parameter. Specially, the beam excellent on the DUV laser drastically affects the laser machining success. The beam good quality from the DUV laser is decided by that of the fundamental laser plus the crystal for your frequency conversion. A short while ago, a substantial-power DUV laser (>10 W) at 258 nm was claimed using a beam top quality of M2 < one.five, which was generated by FHG of a Yb:YAG laser at 1030 nm utilizing the CLBO crystal [13]. This laser would bring about a far better laser machining outcome as compared to the previous DUV lasers with greater M2.
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What's more, combining the sound-point out laser with other nonlinear method for example stimulated Raman scattering, NIR lasers could be attained at new wavelengths with significant power and large beam good quality, which was analyzed from the proof-of-principle experiment. This Raman laser scheme offers a fresh route to the superior-ability click here DUV laser, especially at the wavelength of 193 nm.
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Its UV absorption edge reaches 180 nm. The productive nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about twice as huge as that of KDP. CLBO crystals can be grown from the stoichiometric melt with lessen viscosity.
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