5 Easy Facts About CLBO Crystal Described
5 Easy Facts About CLBO Crystal Described
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All-sound-condition ultraviolet lasers are already broadly Utilized in the fields of mechanical flaw detection, lithography, micromachining and medication for the benefits of modest volume, lengthy existence, higher performance, fantastic beam top quality, vast tuning and slim spectral line, and so on. Using large electrical power around-infrared coherent light resource as the fundamental frequency resource determined by nonlinear tuning technological innovation, building ultraviolet coherent radiation by multistage frequency conversion is considered to be a significant method to acquire the ultraviolet coherent light supply.
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We summarized The existing development position with the substantial-energy DUV laser both at the wavelength of FHG from the one-μm laser and at 193 nm. The recent advancement of the stable-state/fiber laser, together with the nonlinear optical crystals, prompts not merely the normal energy but will also the beam good quality (coherence) of the DUV lasers to an unprecedented stage.
The standard electricity on the NIR laser however has the probable to get improved to tens of watts like 70 W [26] if the double-go configuration may very well be utilized with the Yb:YAG SCF amplifier stage. Hence, If your conversion efficiency of 31% from NIR to DUV might be however maintained at this increased ability problem, the common output ability of the DUV laser at 258 nm may be greater than 20 W, which would be a amazing energy stage for the DUV laser and bring on the unanticipated DUV laser machining outcomes. Also, for prime-electric power DUV laser, the UV injury on the nonlinear crystal, such as the windows for CLBO crystal along with the mirrors, is another essential parameter for long-term and secure Procedure.
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Mainly because of the thermal lens outcome during the solid-point out lasers, If your heating management is insufficient, it is not uncomplicated to obtain the stable-state laser that has a large ability plus a high beam good quality simultaneously. Recently, with the development of the thin disk laser and solitary-crystal fiber (SCF) laser, a superior-electrical power laser at the elemental wavelength (1 μm) were understood with a great beam excellent even with a TEM00 mode beam [4,24], which might be great candidates for the basic with the DUV laser technology. Yet another candidate for the fundamental may be the large-electrical power fiber laser which may be reached by coherent beam mixture with M2 value lower than one.
On the opposite facet, the facility scaling on the NIR laser is an additional component to improve the regular energy get more info in the 193-nm DUV laser. Mainly because of the insufficient the substantial-ability amplification solution from the NIR laser (as an example at 1553 nm), nonlinear frequency processes for instance optical parameter oscillation (OPO) could be placed on produce a wavelength converter by shifting the wavelength from one μm to the desired wavelength and also acquiring relative increased ability [21]. Lately, a diamond Raman laser confirmed its capacity in obtaining a large electric power in addition to a superior conversion effectiveness with the 1st Stokes on the one-μm laser [22,23], which suggests the possibility to generally be utilized inside the 193-nm DUV laser generation due to its high Raman acquire and large frequency change.
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The heart beat duration of the second Stokes light-weight was shortened to five ns as proven in Determine 7a, one-shot image in the oscilloscope, which is a typical phenomenon in Raman laser [44] when the pulse period in the pump laser was ten ns.
Also, combining the solid-condition laser with other nonlinear course of action like stimulated Raman scattering, NIR lasers could be reached at new wavelengths with high electrical power and superior beam high quality, which was examined with the evidence-of-theory experiment. This Raman laser plan presents a completely new path to the high-energy DUV laser, Specifically with the wavelength of 193 nm.
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