All-reliable-point out ultraviolet lasers are actually greatly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of modest volume, extended daily life, large effectiveness, good beam good quality, wide tuning and slender spectral line, etc. Employing significant electric power in close proximity to-infrared coherent mild resource as the basic frequency resource according to nonlinear tuning technology, building ultraviolet coherent radiation by multistage frequency conversion is considered an important way to produce the ultraviolet coherent light-weight supply.
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Based on the proof-of-theory experiment, the conversion efficiency of 23% implied the potential of accomplishing higher-electrical power at the next Stokes wavelength on the Raman laser. In the event the pump laser of 1078 nm may very well be received at the standard ability of fifty W, the output electric power of its 2nd Stokes wavelength at 1512 nm may very well be in excess of ten W. The design in the Raman laser cavity should be optimized so as to stay away from the injury in the M1 and diamond surface.
The important thing difficulty of ultraviolet coherent light resource mainly focuses on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is without doubt one of the disorders for frequency transformation, so The expansion, sizing, injury resistance, conversion performance and allowable parameter range of nonlinear optical crystal are essential Progressively more.
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On another side, the facility scaling with the NIR laser is an additional element to increase the ordinary energy of the 193-nm DUV laser. Because of the not enough the substantial-energy amplification Alternative on the NIR laser (for instance at 1553 nm), nonlinear frequency procedures such as optical parameter oscillation (OPO) may very well be applied to make a wavelength converter by shifting the wavelength from one μm to the desired wavelength and also getting relative better energy [21]. Not long ago, a diamond Raman laser confirmed its capability in obtaining a superior energy plus a significant conversion performance at the 1st Stokes from the 1-μm laser [22,23], which implies the possibility to become utilized in the 193-nm DUV laser technology because of its high Raman gain and enormous frequency change.
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While in the scientific and industrial programs, the beam good quality on the DUV laser is additionally a crucial parameter. Specifically, the beam good quality of your DUV laser considerably influences the laser machining benefits. The beam top quality from the DUV laser is decided by that of the basic laser and the crystal for that frequency conversion. Not too long ago, a high-electric power DUV laser (>10 W) at 258 nm was described having a beam excellent of M2 < one.5, which was produced by FHG of the Yb:YAG laser at 1030 nm using the CLBO crystal [thirteen]. This laser would lead to an improved laser machining result when compared with the former DUV lasers with greater M2.
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Its UV absorption edge reaches one hundred eighty nm. The effective nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about 2 times as substantial as that of KDP. CLBO crystals might be grown within the stoichiometric soften with reduce viscosity.
The event in the 193-nm laser was shown by stages of SFG. So that you can scale the DUV laser electrical power effectively, a fresh notion of your 193-nm DUV laser generation is offered based on the diamond Raman laser.