CLBO Crystal Fundamentals Explained

CLBO Crystal Fundamentals Explained

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All-strong-condition ultraviolet lasers are greatly used in the fields of mechanical flaw detection, lithography, micromachining and medicine for the advantages of tiny volume, prolonged lifestyle, superior efficiency, very good beam excellent, extensive tuning and narrow spectral line, etcetera. Making use of large energy near-infrared coherent gentle source as the basic frequency source based on nonlinear tuning technological know-how, producing ultraviolet coherent radiation by multistage frequency conversion is considered to be a crucial way to establish the ultraviolet coherent gentle source.

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The typical power with the NIR laser still has the probable being improved to tens of watts including 70 W [26] if the double-move configuration may be used for the Yb:YAG SCF amplifier stage. For this reason, When the conversion performance of 31% from NIR to DUV may be nonetheless preserved at this higher electricity situation, the normal output energy on the DUV laser at 258 nm can be over 20 W, which would be described as a remarkable electricity stage for your DUV laser and cause the unanticipated DUV laser machining results. In addition, for prime-electric power DUV laser, the UV destruction of the nonlinear crystal, including the Home windows for CLBO crystal and the mirrors, is another crucial parameter for long lasting and stable Procedure.

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A result of the thermal lens impact inside the strong-point out lasers, In case the heating management is insufficient, It isn't quick to acquire the solid-state laser having a superior electricity along with a superior beam good quality simultaneously. Not long ago, with the development of the thin disk laser and one-crystal fiber (SCF) laser, a high-electric power laser at the elemental wavelength (one μm) were understood with a superb beam quality Despite a TEM00 method beam [4,24], which might be good candidates for the elemental of your DUV laser generation. Another candidate for the basic would be the large-ability fiber laser which could be attained by coherent beam blend with M2 benefit a lot less than 1.

On the other facet, the power scaling of the NIR laser is yet another factor to boost the average electric power in the 193-nm DUV laser. Due to get more info the not enough the substantial-power amplification Remedy of your NIR laser (for instance at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) can be applied to create a wavelength converter by shifting the wavelength from 1 μm to the desired wavelength and also acquiring relative better electric power [21]. Not too long ago, a diamond Raman laser confirmed its means in achieving a high electric power in addition to a superior conversion performance for the 1st Stokes with the 1-μm laser [22,23], which suggests the likelihood for being applied in the 193-nm DUV laser technology thanks to its substantial Raman gain and enormous frequency shift.

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The heart beat duration of the 2nd Stokes light was shortened to 5 ns as revealed in Figure 7a, one-shot picture with the oscilloscope, that's a common phenomenon in Raman laser [forty four] though the pulse length of your pump laser was ten ns.

Moreover, combining the sound-condition laser with other nonlinear course of action such as stimulated Raman scattering, NIR lasers might be attained at new wavelengths with substantial electric power and significant beam excellent, which was analyzed because of the proof-of-principle experiment. This Raman laser scheme supplies a whole new route to the higher-power DUV laser, especially on the wavelength of 193 nm.

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