CLBO Crystal Can Be Fun For Anyone
CLBO Crystal Can Be Fun For Anyone
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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 smaller volume, very long existence, high effectiveness, superior beam top quality, huge tuning and narrow spectral line, and so forth. Making use of high electric power close to-infrared coherent light source as the elemental frequency supply according to nonlinear tuning know-how, building ultraviolet coherent radiation by multistage frequency conversion is regarded as a crucial strategy to acquire the ultraviolet coherent light-weight source.
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We summarized the current growth status from the higher-power DUV laser both within the wavelength of FHG on the 1-μm laser and at 193 nm. The latest improvement of the sound-state/fiber laser, plus the nonlinear optical crystals, prompts not only the normal electrical power but will also the beam excellent (coherence) from the DUV lasers to an unparalleled degree.
For illustration, The present concave OC could be replaced by a airplane mirror which could mitigate the ability density within the surface of M1 as well as diamond. Also, employing large harm threshold coatings for M1 and diamond would also Increase the output electricity without any damages. Then, the NIR laser with the 2nd Stokes wavelength could possibly be superior adequate, as well as its fantastic beam high quality, to deliver the final DUV laser at 193 nm which has a substantial average electricity.
However, the beam top quality of this greater electrical power DUV laser would grow to be worse as a result of a lot more significant thermal and nonlinear results. Therefore, the frequency conversion processes should be carefully designed to mitigate the aforementioned consequences. Thus, a high-electrical power DUV laser in the FHG of 1 μm with a very good beam high-quality may very well be acquired and will be valuable for acquiring the shorter wavelength DUV lasers including 193 nm by SFG.
Each the 1040 nm and 1078 nm laser originate from just one dual-wavelength Yb-doped fiber laser. Each laser is amplified by phases of fiber amplifier and Yb-doped components amplifier, respectively.
On one other aspect, the power scaling in the NIR laser is another element to increase the normal electricity on the 193-nm DUV laser. As a result of lack of the higher-ability amplification Remedy with the NIR laser (one example is at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) can be applied to build a wavelength converter by shifting the wavelength from 1 μm to the specified wavelength as well as getting relative bigger electrical power [21]. Not too long ago, a diamond Raman laser showed its capability in obtaining a high electric power along with a superior conversion efficiency in the 1st Stokes on the 1-μm laser [22,23], which implies the likelihood to generally be used in the 193-nm DUV laser generation because of its high Raman achieve and huge frequency change.
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The pulse duration of the next Stokes light-weight was shortened to five ns as proven in Determine 7a, only one-shot picture from your oscilloscope, which can be a standard phenomenon in Raman laser [forty four] though the heart beat length in the pump more info laser was ten ns.
Moreover, combining the strong-condition laser with other nonlinear system such as stimulated Raman scattering, NIR lasers may very well be accomplished at new wavelengths with high energy and substantial beam good quality, which was analyzed by the evidence-of-principle experiment. This Raman laser plan supplies a completely new route to the significant-power DUV laser, Particularly on the wavelength of 193 nm.
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