All-solid-state ultraviolet lasers have already been broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for some great benefits of compact quantity, prolonged lifetime, substantial effectiveness, very good beam excellent, huge tuning and slim spectral line, etcetera. Using higher energy in the vicinity of-infrared coherent gentle source as the basic frequency supply dependant on nonlinear tuning technological know-how, creating ultraviolet coherent radiation by multistage frequency conversion is viewed as a crucial solution to produce the ultraviolet coherent light-weight source.
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According to the proof-of-theory experiment, the conversion performance of 23% implied the possibility of obtaining superior-energy at the second Stokes wavelength of your Raman laser. If the pump laser of 1078 nm could possibly be acquired at the common energy of 50 W, the output electrical power of its 2nd Stokes wavelength at 1512 nm may be a lot more than 10 W. The design of the Raman laser cavity really should be optimized so as to stay away from the harm of your M1 and diamond area.
The standard electric power on the NIR laser nevertheless has the possible to generally be improved to tens of watts such as 70 W [26] Should the double-move configuration could possibly be used for your Yb:YAG SCF amplifier phase. For this reason, In the event the conversion performance of 31% from NIR to DUV could possibly be still taken care of at this bigger ability problem, the normal output electric power in the DUV laser at 258 nm may very well be a lot more than twenty W, which might be a exceptional electricity stage to the DUV laser and bring on the unanticipated DUV laser machining success. Additionally, for top-ability DUV laser, the UV destruction of the nonlinear crystal, including the Home windows for CLBO crystal as well as mirrors, is yet another vital parameter for long-lasting and stable Procedure.
Alternatively, the beam quality of this higher power DUV laser would become worse as a consequence of additional critical thermal and nonlinear effects. Consequently, the frequency conversion procedures must be thoroughly meant to mitigate the aforementioned effects. As a result, a superior-energy DUV laser with the FHG of one μm with an excellent beam quality may be received and may be effective for getting the shorter wavelength DUV lasers like 193 nm by SFG.
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On the opposite side, the ability scaling from the NIR laser is yet another element to increase the normal energy on the 193-nm DUV laser. Due to lack of the substantial-ability amplification Remedy with the NIR laser (for instance at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) can be placed on create a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and also acquiring relative bigger energy [21]. Just lately, a diamond Raman laser get more info confirmed its means in achieving a high power and a high conversion performance for the 1st Stokes with the 1-μm laser [22,23], which implies the chance being utilized from the 193-nm DUV laser era on account of its higher Raman attain and huge frequency change.
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Cesium Lithium Borate (CsLiB6O10 or CLBO) is the most effective non-linear crystal which generates ultraviolet harmonics of the Nd:YAG essential laser wavelength. As a way to improve the destruction threshold, very low CLBO surface area roughness, by extremely-precision machining, is needed. As the CLBO crystal has straightforward hydroscopic response and micro scratches in machining, ultra-specific machining in the CLBO crystal is usually a complicated specialized problem.
Tunable ultraviolet laser supply determined by sound-state dye laser technologies and CsLiB6O10 harmonic technology
Its UV absorption edge reaches 180 nm. The productive nonlinear optical coefficient of CLBO for frequency doubling at 1064nm is about twice as significant as that of KDP. CLBO crystals might be developed through the stoichiometric soften with reduced viscosity.
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