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The main element problem of ultraviolet coherent gentle resource primarily concentrates on the event of nonlinear optical frequency conversion crystal in ultraviolet band. The nonlinear optical crystal is one of the situations for frequency transformation, so The expansion, measurement, hurt resistance, conversion efficiency and allowable parameter array of nonlinear optical crystal are necessary An increasing number of.

Alternatively, the beam quality of this bigger electricity DUV laser would turn into worse because of additional really serious thermal and nonlinear effects. That's why, the frequency conversion procedures needs to be diligently made to mitigate the aforementioned effects. So, a substantial-energy DUV laser with the FHG of one μm with an excellent beam excellent might be acquired and can be useful for acquiring the shorter wavelength DUV lasers for example 193 nm by SFG.

Due to thermal lens outcome within the sound-point out lasers, if the heating management is insufficient, It is far from simple to obtain the strong-point out laser with a higher energy plus a large beam high quality simultaneously. Lately, with the event of the thin disk laser and single-crystal fiber (SCF) laser, a significant-energy laser at the basic CLBO Crystal wavelength (1 μm) were understood with a fantastic beam high-quality In spite of a TEM00 manner beam [4,24], which might be good candidates for the basic of your DUV laser technology. One more candidate for the basic may be the high-electric power fiber laser which could be reached by coherent beam mix with M2 value below 1.

On one other facet, the power scaling in the NIR laser is yet another component to improve the regular energy of your 193-nm DUV laser. Because of the insufficient the substantial-energy amplification Remedy in the NIR laser (by way of example at 1553 nm), nonlinear frequency procedures for instance optical parameter oscillation (OPO) could be placed on establish a wavelength converter by shifting the wavelength from one μm to the desired wavelength and also obtaining relative better electric power [21]. Just lately, a diamond Raman laser confirmed its ability in attaining a large energy as well as a significant conversion efficiency for the 1st Stokes of your one-μm laser [22,23], which means the likelihood to get utilized in the 193-nm DUV laser technology thanks to its substantial Raman get and enormous frequency change.

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The heartbeat period of the next Stokes gentle was shortened to 5 ns as revealed in Figure 7a, only one-shot photograph within the oscilloscope, which is a standard phenomenon in Raman laser [forty four] even though the heartbeat length from the pump laser was ten ns.

Additionally, combining the stable-condition laser with other nonlinear procedure which include stimulated Raman scattering, NIR lasers can be reached at new wavelengths with large power and superior beam excellent, which was tested because of the evidence-of-principle experiment. This Raman laser scheme delivers a fresh path to the higher-electric power DUV laser, Specifically within the wavelength of 193 nm.

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