Not known Factual Statements About CLBO Crystal
Not known Factual Statements About CLBO Crystal
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In accordance with the evidence-of-principle experiment, the conversion effectiveness of 23% implied the potential of accomplishing high-electricity at the 2nd Stokes wavelength in the Raman laser. In case the pump laser of 1078 nm can be received at the standard energy of fifty W, the output ability of its 2nd Stokes wavelength at 1512 nm may very well be in excess of ten W. The design from the Raman laser cavity needs to be optimized in an effort to avoid the destruction in the M1 and diamond surface.
The typical electricity of the NIR laser however has the likely to become enhanced to tens of watts such as 70 W [26] If your double-pass configuration may be used to the Yb:YAG SCF amplifier phase. That's why, Should the conversion efficiency of 31% from NIR to DUV may very well be still taken care of at this better power situation, the average output electrical power on the DUV laser at 258 nm may very well be in excess of 20 W, which would be described as a exceptional electricity degree for your DUV laser and bring about the unanticipated DUV laser machining final results. In addition, for prime-ability DUV laser, the UV damage from the nonlinear crystal, such as the Home windows for CLBO crystal along with the mirrors, is yet another crucial parameter for long-lasting and secure Procedure.
Alternatively, the beam excellent of the greater electric power DUV laser would become worse as a result of far more really serious thermal and nonlinear outcomes. As a result, the frequency conversion procedures really should be diligently built to mitigate the aforementioned results. As a result, a substantial-electricity DUV laser on the FHG of 1 μm with a good beam high-quality may very well be received and will be valuable for acquiring the shorter wavelength DUV lasers like 193 nm by SFG.
LBO is likewise an excellent nonlinear crystal which is always placed on the SHG from the NIR towards the green. The DUV laser is normally understood by two levels of SFG from the LBO crystals considering the fact that there is no section-matching angle for LBO to transform the eco-friendly laser at 515 nm or 532 nm towards the DUV directly by SHG [sixteen]. Just lately, the NSBBF crystal has also proven its potential to acquire a large conversion efficiency from 532 nm to 266 nm. The walk-off angle and deff of your NSBBF are Practically similar to All those of CLBO [17].
On the opposite side, the ability scaling of the NIR laser is an additional part to boost the normal energy with the 193-nm DUV laser. As a result of deficiency of the high-electrical power amplification Remedy of your NIR laser (for instance at 1553 nm), nonlinear frequency processes for example optical parameter oscillation (OPO) can be placed on make a wavelength converter by shifting the wavelength from one μm to the desired wavelength together with acquiring relative increased electric power [21]. A short while ago, a diamond Raman laser confirmed its potential in acquiring a significant electric power and also a significant conversion effectiveness in the 1st Stokes of the one-μm laser [22,23], which implies the chance to get applied during the 193-nm DUV laser era due to its higher Raman gain and large frequency shift.
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During the scientific and industrial programs, the beam high-quality in the DUV laser is also a crucial parameter. Significantly, the beam top quality of your DUV laser significantly impacts the laser machining outcomes. The beam high-quality from the DUV laser is determined by that of the basic laser along with the crystal with the frequency conversion. Recently, a higher-electricity DUV laser (>10 W) at 258 nm was documented by using a beam top quality of M2 < 1.five, which was produced by FHG of a Yb:YAG laser at 1030 nm using the CLBO crystal [thirteen]. This laser would produce a far better laser machining final result compared to the previous DUV lasers with larger M2.
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Tunable ultraviolet laser supply based on stable-condition dye laser engineering and CsLiB6O10 harmonic generation
The conversion efficiency from elementary NIR to DUV is from 5% to 36% in accordance with the documented leads to Desk 1. Raising the conversion effectiveness will lessen the load on the look and setup of the fundamental laser amplifier and also the electric powered electric power consumption. A superb beam quality of the basic laser will also lead into the rising from the conversion performance in addition to the appropriate power intensity in the NIR and environmentally friendly laser within the SHG and FHG course of action, respectively. The best conversion efficiencies from NIR to inexperienced and environmentally friendly to DUV laser by utilization of CLBO crystal are 70% and around 50%, respectively [12], which corresponds towards the conversion performance of 35% from essential to DUV.
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