All-sound-state ultraviolet lasers have already been extensively Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of smaller volume, lengthy lifestyle, higher performance, superior beam quality, large tuning and narrow spectral line, etcetera. Using substantial electrical power around-infrared coherent light supply as the fundamental frequency supply dependant on nonlinear tuning technology, generating ultraviolet coherent radiation by multistage frequency conversion is considered to be a very important way to acquire the ultraviolet coherent light resource.
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We summarized The present development standing from the high-electric power DUV laser each within the wavelength of FHG on the one-μm laser and at 193 nm. The modern development on the solid-condition/fiber laser, along with the nonlinear optical crystals, prompts not merely the common power but will also the beam top quality (coherence) in the DUV lasers to an unparalleled amount.
The important thing difficulty of ultraviolet coherent mild supply mainly concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is probably the ailments for frequency transformation, so The expansion, measurement, problems resistance, conversion performance and allowable parameter variety of nonlinear optical crystal are expected An increasing number of.
However, the beam high-quality of this increased power DUV laser would turn into even worse as a result of extra significant thermal and nonlinear consequences. Therefore, the frequency conversion processes must be diligently made to mitigate the aforementioned results. As a result, a large-electrical power DUV laser within the FHG of one μm with a good beam high quality can be attained and can be valuable for acquiring the shorter wavelength DUV lasers for example 193 nm by SFG.
LBO can be an excellent nonlinear crystal which is usually placed on the SHG from the NIR for the inexperienced. The DUV laser is usually realized by two stages of SFG inside the LBO crystals due to the fact there isn't any stage-matching angle for LBO to convert the eco-friendly laser at 515 nm or 532 nm for the DUV immediately by SHG [16]. A short while ago, the NSBBF crystal has also revealed its opportunity to acquire a substantial conversion effectiveness from 532 nm to 266 nm. The walk-off angle and deff of the NSBBF are Just about much like Those people of CLBO [seventeen].
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The heart beat length of the next Stokes light was shortened to 5 ns as proven in Determine 7a, only one-shot photo through the oscilloscope, which happens to be a standard phenomenon in Raman laser [forty four] when the pulse period with the pump laser was ten ns.
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The conversion effectiveness from fundamental NIR to DUV is from 5% to 36% based on the claimed leads to Table 1. Increasing the conversion effectiveness will decrease the stress on the look and set up of the fundamental laser amplifier and also the electric powered power usage. A superb beam quality of the elemental laser will also contribute for the rising with the conversion performance in addition to the appropriate energy intensity of the NIR and green laser inside the SHG and FHG process, respectively. The best conversion efficiencies from NIR to environmentally friendly and inexperienced to DUV laser by utilization of CLBO crystal are 70% and all around 50%, respectively [twelve], which corresponds to the conversion effectiveness of 35% from fundamental to DUV.
The event from the 193-nm laser was shown by levels of SFG. In an effort to scale the DUV laser power proficiently, a fresh thought in the 193-nm DUV laser technology is presented according to the diamond Raman laser.