All-solid-state ultraviolet lasers have already been greatly Employed in the fields of mechanical flaw detection, lithography, micromachining and drugs for the benefits of smaller volume, extended daily life, substantial effectiveness, great beam high quality, vast tuning and narrow spectral line, and so on. Utilizing high power near-infrared coherent gentle resource as the basic frequency supply dependant on nonlinear tuning technological innovation, producing ultraviolet coherent radiation by multistage frequency conversion is considered to be a very important strategy to build the ultraviolet coherent gentle source.
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Based on the proof-of-theory experiment, the conversion performance of 23% implied the potential of achieving substantial-electricity at the second Stokes wavelength in the Raman laser. If your pump laser of 1078 nm can be attained at the average power of fifty W, the output ability of its 2nd Stokes wavelength at 1512 nm may be a lot more than ten W. The design on the Raman laser cavity must be optimized in an effort to avoid the damage on the M1 and diamond surface area.
The standard power from the NIR laser nonetheless has the possible to generally be improved to tens of watts which include 70 W [26] When the double-move configuration may be used for that Yb:YAG SCF amplifier stage. Therefore, If your conversion effectiveness of 31% from NIR to DUV could possibly be still preserved at this greater ability condition, the common output ability from the DUV laser at 258 nm may very well be much more than twenty W, which might be a impressive ability amount for the DUV laser and bring about the unanticipated DUV laser machining outcomes. In addition, for prime-electric power DUV laser, the UV destruction with the nonlinear crystal, such as the Home windows for CLBO crystal plus the mirrors, is another significant parameter for long-lasting and steady operation.
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LBO is additionally a wonderful nonlinear crystal which is always applied to the SHG with the NIR on the environmentally friendly. The DUV laser is generally understood by two levels of SFG in the LBO crystals considering that there is not any section-matching angle for LBO to convert the eco-friendly laser at 515 nm or 532 nm on the DUV instantly by SHG [sixteen]. Lately, the NSBBF crystal has also proven its possible to obtain a superior conversion performance from 532 nm to 266 nm. The wander-off angle and deff with the NSBBF are Just about much like Individuals of CLBO [17].
On another aspect, the ability scaling in the NIR laser is an additional factor to improve the normal electric power with the 193-nm DUV laser. Due to lack of the large-electricity amplification Remedy of your NIR laser (for instance at 1553 nm), nonlinear frequency procedures including optical parameter oscillation (OPO) can be applied to develop a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and also obtaining relative higher electrical power [21]. Lately, a diamond Raman laser showed its capacity in acquiring a substantial electrical power as well as a significant conversion performance for the 1st Stokes of your one-μm laser [22,23], which means the possibility to get utilized inside the 193-nm DUV laser generation because of its superior Raman get and huge frequency change.
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Also, combining the sound-point out laser with other nonlinear procedure including stimulated Raman scattering, NIR lasers can be attained at new wavelengths with superior energy and higher beam good quality, which was analyzed by the proof-of-principle experiment. This Raman laser scheme delivers a new route to the higher-electrical power DUV laser, Specially on the wavelength of 193 nm.
Tunable ultraviolet laser supply determined by stable-condition dye laser know-how and read more CsLiB6O10 harmonic era
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