All-solid-state ultraviolet lasers have already been commonly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for some great benefits of small quantity, long existence, substantial performance, superior beam high-quality, huge tuning and slim spectral line, etc. Employing superior energy close to-infrared coherent light-weight resource as the basic frequency source based on nonlinear tuning technologies, building ultraviolet coherent radiation by multistage frequency conversion is viewed as a very important strategy to develop the ultraviolet coherent mild supply.
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The main element challenge of ultraviolet coherent light-weight resource mainly focuses on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is among the circumstances for frequency transformation, so the growth, size, damage resistance, conversion efficiency and allowable parameter range of nonlinear optical crystal are required Increasingly more.
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On one other aspect, the facility scaling on the NIR laser is another aspect to enhance the regular electrical power CLBO Crystal from the 193-nm DUV laser. Due to the not enough the high-ability amplification Remedy from the NIR laser (for instance at 1553 nm), nonlinear frequency procedures like optical parameter oscillation (OPO) can be placed on establish a wavelength converter by shifting the wavelength from one μm to the desired wavelength and also getting relative increased electric power [21]. A short while ago, a diamond Raman laser showed its skill in attaining a substantial power in addition to a higher conversion performance for the 1st Stokes with the 1-μm laser [22,23], which implies the chance being utilized in the 193-nm DUV laser technology thanks to its significant Raman achieve and large frequency change.
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The beam profile proven in Figure 7b demonstrated a superb beam high-quality as among the merits of Raman laser, which would be valuable to crank out a 193-nm DUV laser with a top quality beam.
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