All-solid-point out ultraviolet lasers are already broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medicine for some great benefits of small volume, lengthy everyday living, significant effectiveness, very good beam high-quality, vast tuning and narrow spectral line, etcetera. Making use of large energy in the vicinity of-infrared coherent gentle supply as the elemental frequency supply according to nonlinear tuning technological know-how, creating ultraviolet coherent radiation by multistage frequency conversion is thought to be an essential way to develop the ultraviolet coherent mild supply.
As compared to BBO it attributes larger sized spectral and temperature acceptance, much better angle tolerance, and also a lesser stroll-off angle. from 3289 $ supply
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For illustration, The present concave OC could be replaced by a plane mirror which could mitigate the power density on the area of M1 plus the diamond. Furthermore, utilizing large hurt threshold coatings for M1 and diamond would also Enhance the output energy with none damages. Then, the NIR laser on the 2nd Stokes wavelength could be substantial enough, and also its good beam good quality, to deliver the final DUV laser at 193 nm by using a superior typical electricity.
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Mainly because of the thermal lens outcome during the stable-point out lasers, When the heating administration is inadequate, it is not straightforward to acquire the reliable-point out laser by using a high electricity along with a substantial beam quality concurrently. Just lately, with the event of the thin disk laser and single-crystal fiber (SCF) laser, a substantial-energy laser at the elemental wavelength (1 μm) had been understood with a good beam good quality Despite having a TEM00 manner beam [4,24], which would be fantastic candidates for the fundamental in the DUV laser era. A different prospect for the elemental is the higher-energy fiber laser which might be accomplished by coherent beam combination with M2 benefit a lot less than 1.
On the other facet, the ability scaling on the NIR laser is another aspect to enhance the average power of your 193-nm DUV laser. Due to the not enough the substantial-energy amplification solution with the NIR laser (one example is at 1553 nm), nonlinear frequency processes such as optical parameter oscillation (OPO) may very well be applied to produce a wavelength converter by shifting the wavelength from one μm to the specified wavelength as well as acquiring relative better power [21]. Just lately, a diamond Raman laser confirmed its means in reaching a large energy as well as a significant conversion performance within the 1st Stokes of the one-μm laser [22,23], which means the chance being used during the 193-nm DUV laser generation because of its higher Raman acquire and large frequency shift.
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From the scientific and industrial apps, the beam top quality in the DUV laser is usually a significant parameter. Specifically, the beam quality of your DUV laser considerably affects the laser machining effects. The beam high-quality on the DUV laser is decided by that of the fundamental laser plus the crystal for the frequency conversion. Just lately, a high-electrical power DUV laser (>ten W) at 258 nm was described with a beam top quality of M2 < 1.5, which was generated by FHG of a Yb:YAG laser at 1030 check here nm using the CLBO crystal [13]. This laser would bring on an even better laser machining result when compared with the past DUV lasers with larger sized M2.
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The beam profile proven in Figure 7b demonstrated a great beam top quality as one of several merits of Raman laser, which would be advantageous to generate a 193-nm DUV laser with a high quality beam.
Its UV absorption edge reaches a hundred and eighty nm. The productive nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about two times as large as that of KDP. CLBO crystals is usually grown from the stoichiometric melt with lower viscosity.
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