All-sound-point out ultraviolet lasers are already widely Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for the advantages of compact volume, very long existence, superior efficiency, excellent beam high-quality, huge tuning and slim spectral line, etc. Using significant electrical power in close proximity to-infrared coherent light-weight source as the basic frequency supply based on nonlinear tuning know-how, generating ultraviolet coherent radiation by multistage frequency conversion is thought to be a vital solution to create the ultraviolet coherent light source.
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Based on the proof-of-theory experiment, the conversion effectiveness of 23% implied the opportunity of attaining significant-electricity at the second Stokes wavelength in the Raman laser. In case the pump laser of 1078 nm can be received at the common electricity of 50 W, the output energy of its 2nd Stokes wavelength at 1512 nm might be more than ten W. The look on the Raman laser cavity must be optimized in an effort to stay away from the harm of the M1 and diamond area.
The real key challenge of ultraviolet coherent mild supply mostly focuses on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is one of the disorders for frequency transformation, so The expansion, measurement, problems resistance, conversion effectiveness and allowable parameter selection of nonlinear optical crystal are demanded more and more.
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As a result of thermal lens result from the good-point out lasers, When the heating management is insufficient, It's not necessarily uncomplicated to acquire the good-point out laser with a high energy along with a higher beam high quality simultaneously. Recently, with the development of the thin disk laser and single-crystal fiber (SCF) laser, a high-power laser at the elemental wavelength (one μm) had been realized with a great beam high quality even with a TEM00 manner beam [4,24], which would be superior candidates for the fundamental on the DUV laser era. A different applicant for the basic will be the high-power fiber laser which could be obtained by coherent beam mixture with M2 benefit below one.
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The heartbeat duration of the 2nd Stokes mild was shortened to five ns as proven in Figure 7a, just one-shot image in the oscilloscope, which is a typical phenomenon in Raman laser [44] when the pulse length from the pump laser was ten ns.
Furthermore, combining the solid-condition laser with other nonlinear system for example stimulated Raman scattering, NIR lasers can be obtained at new wavelengths with significant electricity and higher beam high quality, which was analyzed through the proof-of-basic principle experiment. This Raman laser plan delivers a different route to the substantial-energy DUV laser, Primarily in more info the wavelength of 193 nm.
Tunable ultraviolet laser resource depending on reliable-point out dye laser engineering and CsLiB6O10 harmonic era
The conversion performance from essential NIR to DUV is from 5% to 36% according to the reported leads to Desk one. Expanding the conversion efficiency will decrease the stress on the look and setup of the fundamental laser amplifier in addition to the electric powered electric power intake. A fantastic beam high quality of the fundamental laser may even contribute towards the increasing on the conversion performance and also the suitable electrical power intensity from the NIR and inexperienced laser in the SHG and FHG approach, respectively. The best conversion efficiencies from NIR to green and eco-friendly to DUV laser by utilization of CLBO crystal are 70% and all-around fifty%, respectively [twelve], which corresponds towards the conversion efficiency of 35% from basic to DUV.
The event in the 193-nm laser was shown by phases of SFG. As a way to scale the DUV laser energy effectively, a whole new concept of your 193-nm DUV laser era is introduced determined by the diamond Raman laser.