The 2-Minute Rule for CLBO Crystal

The 2-Minute Rule for CLBO Crystal

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All-reliable-condition ultraviolet lasers are already commonly Utilized in the fields of mechanical flaw detection, lithography, micromachining and drugs for the advantages of little quantity, prolonged daily life, substantial effectiveness, superior beam quality, wide tuning and slender spectral line, and so on. Utilizing large electrical power in the vicinity of-infrared coherent light-weight supply as the elemental frequency resource according to nonlinear tuning engineering, making ultraviolet coherent radiation by multistage frequency conversion is considered to be a crucial method to build the ultraviolet coherent light-weight supply.

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We summarized The existing growth status with the superior-ability DUV laser both equally with the wavelength of FHG from the one-μm laser and at 193 nm. The modern enhancement on the sound-condition/fiber laser, plus the nonlinear optical crystals, prompts not only the normal energy but in addition the beam high-quality (coherence) from the DUV lasers to an unprecedented stage.

The typical electric power from the NIR laser continue to has the opportunity being improved to tens of watts such as 70 W [26] Should the double-pass configuration may very well be utilized with the Yb:YAG SCF amplifier phase. Consequently, When the conversion performance of 31% from NIR to DUV may be nonetheless managed at this larger power issue, the average output electric power from the DUV laser at 258 nm can be in excess of twenty W, which might be considered a amazing power degree for the DUV laser and result in the unanticipated DUV laser machining final results. Additionally, for prime-ability DUV laser, the UV hurt of your nonlinear crystal, such as the Home windows for CLBO crystal as well as mirrors, is yet another important parameter for long-term and secure Procedure.

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LBO is likewise a great nonlinear crystal which is usually placed on the SHG in the NIR to your environmentally friendly. The DUV laser is normally recognized by two phases of SFG from the LBO crystals since there's no stage-matching angle for LBO to transform the inexperienced laser at 515 nm or 532 nm to your DUV instantly by SHG [sixteen]. Not long ago, the NSBBF crystal has also revealed its potential to obtain a high conversion efficiency from 532 nm to 266 nm. The wander-off angle and deff of the NSBBF are almost just like Those people of CLBO [seventeen].

On the opposite aspect, the power scaling of the NIR laser is yet another element to boost the common electrical power in the 193-nm DUV laser. Because of the lack of the significant-electricity amplification Resolution of the NIR laser (such as at 1553 nm), nonlinear frequency processes such as optical parameter oscillation (OPO) can be placed on develop a wavelength converter by shifting the wavelength from one μm to the specified wavelength in addition to getting relative higher electrical power [21]. A short while ago, a diamond Raman laser showed its skill in obtaining a significant power as well as a substantial conversion effectiveness for the 1st Stokes of your 1-μm laser [22,23], which implies the possibility to get used during the 193-nm DUV laser technology because of its higher Raman obtain and large frequency shift.

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The heartbeat duration of the next Stokes light was shortened to five ns as shown in Determine 7a, only one-shot image in the oscilloscope, which happens to be a typical phenomenon in Raman laser [forty four] though the pulse period of the pump laser was 10 ns.

Additionally, combining the strong-condition laser with other nonlinear approach which include stimulated Raman scattering, NIR lasers could possibly be achieved at new wavelengths with substantial energy and large beam good quality, which was examined via the evidence-of-basic principle experiment. This Raman laser scheme gives a fresh route to the higher-electric power DUV laser, In particular in the wavelength of 193 nm.

The beam profile shown in Figure 7b demonstrated a superb beam high-quality as on the list of deserves of Raman laser, which might be beneficial to create a 193-nm DUV laser with a high quality beam.

The conversion performance from basic NIR to DUV is from 5% to 36% based on the noted brings about Table one. Rising the conversion efficiency will lessen the burden on the look and setup of the elemental laser amplifier plus the electric powered electricity more info consumption. A superb beam quality of the basic laser will likely contribute to your raising of the conversion efficiency along with the right ability depth of the NIR and eco-friendly laser inside the SHG and FHG approach, respectively. The very best conversion efficiencies from NIR to inexperienced and inexperienced to DUV laser by utilization of CLBO crystal are 70% and close to 50%, respectively [12], which corresponds for the conversion efficiency of 35% from fundamental to DUV.

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