The 2-Minute Rule for CLBO Crystal
The 2-Minute Rule for CLBO Crystal
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All-solid-state ultraviolet lasers have been widely used in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of small quantity, extensive everyday living, large effectiveness, fantastic beam top quality, vast tuning and slender spectral line, and so on. Employing substantial electrical power in the vicinity of-infrared coherent light source as the basic frequency source according to nonlinear tuning know-how, making ultraviolet coherent radiation by multistage frequency conversion is regarded as a very important strategy to establish the ultraviolet coherent light-weight resource.
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We summarized The present enhancement position on the significant-electricity DUV laser the two in the wavelength of FHG of the one-μm laser and at 193 nm. The latest enhancement in the strong-point out/fiber laser, along with the nonlinear optical crystals, prompts don't just the common ability but in addition the beam high-quality (coherence) of the DUV lasers to an unprecedented degree.
The common ability of your NIR laser nonetheless has the probable to be enhanced to tens of watts which include 70 W [26] If your double-move configuration might be used for your Yb:YAG SCF amplifier stage. Hence, Should the conversion effectiveness of 31% from NIR to DUV could possibly be still managed at this increased energy ailment, the common output power in the DUV laser at 258 nm may very well be greater than 20 W, which would be described as a remarkable electrical power degree for that DUV laser and bring on the unanticipated DUV laser machining results. Moreover, for high-energy DUV laser, the UV damage in the nonlinear crystal, including the windows for CLBO crystal plus the mirrors, is yet another vital parameter for long term and stable Procedure.
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Due to the thermal lens result during the sound-state lasers, If your heating management is inadequate, It's not at all straightforward to acquire the sound-state laser which has a high power plus a large beam excellent simultaneously. Not long ago, with the event of the thin disk laser and solitary-crystal fiber (SCF) laser, a substantial-electric power laser at the elemental wavelength (1 μm) were understood with a great beam quality In spite of a TEM00 manner beam [4,24], which would be great candidates for the fundamental of the DUV laser technology. A different applicant for the fundamental is the superior-electric power fiber laser which may check here be accomplished by coherent beam mixture with M2 value a lot less than 1.
On one other aspect, the ability scaling from the NIR laser is yet another factor to boost the ordinary electricity from the 193-nm DUV laser. Mainly because of the insufficient the substantial-electricity amplification Answer on the NIR laser (for instance at 1553 nm), nonlinear frequency processes including optical parameter oscillation (OPO) may very well be placed on build a wavelength converter by shifting the wavelength from one μm to the specified wavelength and getting relative higher energy [21]. Not too long ago, a diamond Raman laser showed its potential in accomplishing a superior ability in addition to a superior conversion effectiveness at the 1st Stokes from the 1-μm laser [22,23], which means the likelihood to get utilized inside the 193-nm DUV laser era as a result of its significant Raman attain and large frequency shift.
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The conversion efficiency from essential NIR to DUV is from 5% to 36% in accordance with the described leads to Desk 1. Expanding the conversion effectiveness will reduce the load on the look and setup of the basic laser amplifier along with the electrical electricity use. An excellent beam high-quality of the fundamental laser may even add to the escalating with the conversion performance as well as the appropriate electrical power intensity on the NIR and inexperienced laser from the SHG and FHG system, respectively. The best conversion efficiencies from NIR to environmentally friendly and environmentally friendly to DUV laser by usage of CLBO crystal are 70% and all over fifty%, respectively [12], which corresponds towards the conversion efficiency of 35% from fundamental to DUV.
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