All-sound-point out ultraviolet lasers happen to be broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of little volume, very long existence, high efficiency, good beam excellent, wide tuning and slender spectral line, etc. Making use of high electricity in close proximity to-infrared coherent light-weight supply as the elemental frequency source determined by nonlinear tuning technologies, creating ultraviolet coherent radiation by multistage frequency conversion is thought to be a crucial strategy to acquire the ultraviolet coherent gentle supply.
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In accordance with the evidence-of-basic principle experiment, the conversion efficiency of 23% implied the possibility of acquiring substantial-power at the 2nd Stokes wavelength on the Raman laser. If your pump laser of 1078 nm may be obtained at the typical power of fifty W, the output energy of its 2nd Stokes wavelength at 1512 nm could possibly be greater than ten W. The look in the Raman laser cavity ought to be optimized so that you can stay away from the destruction with the M1 and diamond surface.
The crucial element problem of ultraviolet coherent light-weight supply mostly concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is one of the situations for frequency transformation, so The expansion, dimensions, injury resistance, conversion performance and allowable parameter range of nonlinear optical crystal are demanded Progressively more.
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On another facet, the power scaling of your NIR laser is another component to raise the average ability in the 193-nm DUV laser. Mainly because of the read more insufficient the significant-electrical power amplification Option of the NIR laser (by way of example at 1553 nm), nonlinear frequency procedures for example optical parameter oscillation (OPO) may be applied to build a wavelength converter by shifting the wavelength from one μm to the specified wavelength together with acquiring relative better ability [21]. Recently, a diamond Raman laser confirmed its means in acquiring a superior energy as well as a high conversion efficiency at the 1st Stokes on the 1-μm laser [22,23], which suggests the possibility to become used while in the 193-nm DUV laser technology as a consequence of its high Raman gain and huge frequency shift.
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Additionally, combining the good-condition laser with other nonlinear method for example stimulated Raman scattering, NIR lasers may very well be realized at new wavelengths with significant electric power and substantial beam top quality, which was analyzed through the proof-of-basic principle experiment. This Raman laser plan delivers a brand new route to the substantial-power DUV laser, Specially within the wavelength of 193 nm.
Tunable ultraviolet laser resource depending on strong-point out dye laser know-how and CsLiB6O10 harmonic era
Its UV absorption edge reaches 180 nm. The helpful nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about twice as big as that of KDP. CLBO crystals might be developed from the stoichiometric melt with reduced viscosity.
The development in the 193-nm laser was shown by stages of SFG. To be able to scale the DUV laser energy effectively, a whole new notion on the 193-nm DUV laser generation is introduced according to the diamond Raman laser.