A Secret Weapon For CLBO Crystal
A Secret Weapon For CLBO Crystal
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All-good-point out ultraviolet lasers are already greatly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of little volume, extended everyday living, high performance, fantastic beam good quality, huge tuning and narrow spectral line, and so on. Using large energy around-infrared coherent light supply as the basic frequency supply dependant on nonlinear tuning technological know-how, creating ultraviolet coherent radiation by multistage frequency conversion is considered to be a vital approach to develop the ultraviolet coherent gentle supply.
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Based on the evidence-of-basic principle experiment, the conversion effectiveness of 23% implied the opportunity of reaching large-electric power at the 2nd Stokes wavelength with the Raman laser. If the pump laser of 1078 nm can be obtained at the average energy of 50 W, the output electrical power of its 2nd Stokes wavelength at 1512 nm could possibly be over 10 W. The look with the Raman laser cavity need to be optimized so that you can steer clear of the hurt from the M1 and diamond area.
The key difficulty of ultraviolet coherent light source primarily focuses on the development of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is probably the situations for frequency transformation, so The expansion, dimensions, harm resistance, conversion performance and allowable parameter array of nonlinear optical crystal are necessary more and more.
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Within the scientific and industrial applications, the beam quality of the DUV laser is usually a very important parameter. Significantly, the beam excellent in the DUV laser significantly has an effect on the laser machining benefits. The beam high quality on the DUV laser is determined by that of the elemental laser as well as the crystal with the frequency conversion. Just lately, a higher-electric power DUV laser (>10 W) at 258 nm was documented with a beam good quality of M2 < one.five, which was generated by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [thirteen]. This laser would bring about an even better laser machining consequence in comparison with the past DUV lasers with larger M2.
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In addition, combining the stable-point out laser with other nonlinear procedure for example stimulated Raman scattering, NIR lasers could possibly be realized at new wavelengths with superior power and high beam high quality, which was tested from the proof-of-basic principle experiment. This Raman laser plan supplies a whole new route to the higher-power DUV laser, especially within the wavelength of 193 nm.
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The conversion performance from basic NIR to DUV is from five% to 36% according to the described leads to Desk 1. Rising the conversion performance will decrease the stress on the look and set up of the basic laser amplifier and also the electric electric power use. An excellent beam excellent of the elemental laser may also contribute on the expanding of the conversion efficiency along with the suitable electricity intensity on the NIR and inexperienced laser from the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to inexperienced and green to DUV read more laser by usage of CLBO crystal are 70% and all-around fifty%, respectively [12], which corresponds for the conversion efficiency of 35% from elementary to DUV.
The development with the 193-nm laser was demonstrated by phases of SFG. So that you can scale the DUV laser electrical power correctly, a brand new strategy of the 193-nm DUV laser generation is offered dependant on the diamond Raman laser.